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Analysis of Reservoir Forming Conditions and Prediction of Continuous Tight Gas Reservoirs for the Deep Jurassic in the Eastern Kuqa Depression,Tarim Basin 被引量:15
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作者 ZOU Caineng JIA Jinhua +1 位作者 TAO Shizhen TAO Xiaowan 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2011年第5期1173-1186,共14页
The exploration targets in the Kuqa Depression at present are mainly structure traps in Cretaceous-Tertiary.Due to the complexity of mountain distribution and reservoir forming conditions, the exploration of Jurassic ... The exploration targets in the Kuqa Depression at present are mainly structure traps in Cretaceous-Tertiary.Due to the complexity of mountain distribution and reservoir forming conditions, the exploration of Jurassic in the eastern Kuqa Depression has been in a state of semi-stagnation since the discovery of the Yinan-2 gas reservoir.According to the concept and theory of 'continuous petroleum reservoirs' and the re-analysis of the forming conditions of the Yinan-2 gas reservoir and regional natural gas in the eastern Kuqa Depression,it is believed that the deep Jurassic has good natural gas accumulation conditions as well as geological conditions for forming continuous tight gas reservoirs.The boundary of the Yinan-2 gas reservoir is not controlled by a structural spillpoint.The downdip part of the structure is dominated by gas,while the hanging wall of the fault is filled by water and forming obvious inverted gas and water.The gas reservoir has the normal temperature and ultrahigh pressure which formed in the near source or inner-source.All of these characteristics indicate that the Yinan-2 gas reservoir is different from conventional gas reservoirs.The deep Jurassic in the eastern Kuqa Depression has multisets of source-reservoir-cap assemblages,which comprise interbedded sandstones and mudstones.These assemblages are characterized by a self-generation,self-preserving and self-coverage model.Reservoir sandstones and coal measure mudstones are interbedded with each other at a large scale.As the source rocks,Triassic-Jurassic coal measure mudstones distribute continuously at a large scale and can generate and expel hydrocarbon.Source rocks contact intimately with the overlying sandstone reservoirs.During the late stage of hydrocarbon expulsion,natural gas charged continuously and directly into the neighboring reservoirs.Petroleum migrated mainly in a vertical direction over short distances.With ultra-high pressure and strong charging intensity,natural gas accumulated continuously.Reservoirs are dominated by sandstones of braided delta facies.The sand bodies distribute continuously horizontal.With low porosity and low permeability,the reservoirs are featured by strong heterogeneity.It is hypothesized that the sandstones of the interior depression tend to be relatively tight with increasing depth and structure stress weakness.Thus,it is predicted that continuous tight gas reservoirs of ultra-high pressure may exist in the deep formations of the eastern and even the whole Kuqa Depression.So,it is worth evaluating the exploration potential. 展开更多
关键词 forming condition continuous tight gas reservoir deep Jurassic eastern Kuqa Depression
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Geological characteristics and accumulation mechanisms of the "continuous" tight gas reservoirs of the Xu2 Member in the middle-south transition region,Sichuan Basin,China 被引量:12
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作者 Zou Caineng Gong Yanjie +1 位作者 Tao Shizhen Liu Shaobo 《Petroleum Science》 SCIE CAS CSCD 2013年第2期171-182,共12页
"Continuous" tight gas reservoirs are those reservoirs which develop in widespread tight sandstones with a continuous distribution of natural gas. In this paper, we summarize the geological features of the source ro... "Continuous" tight gas reservoirs are those reservoirs which develop in widespread tight sandstones with a continuous distribution of natural gas. In this paper, we summarize the geological features of the source rocks and "'continuous" tight gas reservoirs in the Xujiahe Formation of the middle- south transition region, Sichuan Basin. The source rocks of the Xul Member and reservoir rocks of the Xu2 Member are thick (Xul Member: 40 m, Xu2 Member: 120 m) and are distributed continuously in this study area. The results of drilled wells show that the widespread sandstone reservoirs of the Xu2 Member are charged with natural gas. Therefore, the natural gas reservoirs of the Xu2 Member in the middle-south transition region are "continuous" tight gas reservoirs. The accumulation of "continuous" tight gas reservoirs is controlled by an adequate driving force of the pressure differences between source rocks and reservoirs, which is demonstrated by a "one-dimensional" physical simulation experiment. In this simulation, the natural gas of"continuous" tight gas reservoirs moves tbrward with no preferential petroleum migration pathways (PPMP), and the natural gas saturation of"continuous" tight gas reservoirs is higher than that of conventional reservoirs. 展开更多
关键词 Geological characteristics accumulation mechanism continuous tight gas reservoir Xu2Member middle-south transition region Sichuan Basin
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Geochronological Records of Oil-Gas Accumulations in the Permian Reservoirs of the Northeastern Ordos Basin 被引量:4
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作者 CHEN Gang YANG Fu +3 位作者 LI Shuheng ZHANG Huiruo HU Yanxu LEI Panpan 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2013年第6期1701-1711,共11页
Geochronology of oil-gas accumulation (OGA) is a challenging subject of petroleum geology in multi-cycle superimposed basins.By K-Ar dating of authigenic illite (AI) and fluid inclusion (FI) analysis combined wi... Geochronology of oil-gas accumulation (OGA) is a challenging subject of petroleum geology in multi-cycle superimposed basins.By K-Ar dating of authigenic illite (AI) and fluid inclusion (FI) analysis combined with apatite fission track (AFT) thermal modeling,a case study of constraining the OGA times of the Permian reservoirs in northeast Ordos basin (NOB) has been conducted in this paper.AI dating of the Permian oil-gas-bearing sandstone core-samples shows a wide time domain of 178-108 Ma.The distribution of the AI ages presents 2-stage primary OGA processes in the Permian reservoirs,which developed in the time domains of 175-155 Ma and 145-115 Ma with 2-peak ages of 165 Ma and 130 Ma,respectively.The FI temperature peaks of the samples and their projected ages on the AFT thermal path not only present two groups with a low and a high peak temperatures in ranges of 90-78℃ and 125-118℃,respectively corresponding to 2-stage primary OGA processes of 162-153 Ma and 140-128 Ma in the Permian reservoirs,but also appear a medium temperature group with the peak of 98℃ in agreement with a secondary OGA process of c.~30 Ma in the Upper Permian reservoirs.The integrated analysis of the AI and FI ages and the tectono-thermal evolution reveals that the Permian reservoirs in the NOB experienced at least 2-stage primary OGA processes of 165-153 Ma and 140-128 Ma in agreement with the subsidence thermal process of the Mid-Early Jurassic and the tectono-thermal event of the Early Cretaceous.Then,the Upper Permian reservoirs further experienced at least 1-stage secondary OGA process of c.~30 Ma in coincidence with a critical tectonic conversion between the slow and the rapid uplift processes from the Late Cretaceous to Neogene. 展开更多
关键词 northeast Ordos basin (NOB) Permian sandstone reservoirs oil-gas accumulation (OGA) GEOCHRONOLOGY
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Origin, hydrocarbon accumulation and oil-gas enrichment of fault-karst carbonate reservoirs: A case study of Ordovician carbonate reservoirs in South Tahe area of Halahatang oilfield, Tarim Basin 被引量:4
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作者 DING Zhiwen WANG Rujun +9 位作者 CHEN Fangfang YANG Jianping ZHU Zhongqian YANG Zhimin SUN Xiaohui XIAN Bo LI Erpeng SHI Tao ZUO Chao LI Yang 《Petroleum Exploration and Development》 2020年第2期306-317,共12页
Based on comprehensive analysis of tectonic and fault evolution, core, well logging, seismic, drilling, and production data, the reservoir space characteristic, distribution, origin of fault-karst carbonate reservoir ... Based on comprehensive analysis of tectonic and fault evolution, core, well logging, seismic, drilling, and production data, the reservoir space characteristic, distribution, origin of fault-karst carbonate reservoir in Yueman block of South Tahe area, Halahatang oilfield, Tarim Basin, were studied systematically. And the regular pattern of hydrocarbon accumulation and enrichment was analyzed systematically based on development practice of the reservoirs. The results show that fault-karst carbonate reservoirs are distributed in the form of "body by body" discontinuously, heterogeneously and irregularly, which are controlled by the development of faults. Three formation models of fault-karst carbonate reservoirs, namely, the models controlled by the main deep-large fault, the secondary fault and the secondary internal fault, are built. The hydrocarbon accumulation and enrichment of fault-karst carbonate reservoirs is controlled by the spatiotemporal matching relation between hydrocarbon generation period and fault activity, and the size and segmentation of fault. The study results can effectively guide the well deployment and help the efficient development of fault-karst carbonate reservoirs of South Tahe area, Halahatang oilfield. 展开更多
关键词 Tarim Basin Halahatang oilfield South Tahe area ORDOVICIAN fault-karst carbonate reservoir hydrocarbon accumulation oil-gas enrichment
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Performance of Continuous Wavelet Transform over Fourier Transform in Features Resolutions
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作者 Michael K. Appiah Sylvester K. Danuor Alfred K. Bienibuor 《International Journal of Geosciences》 CAS 2024年第2期87-105,共19页
This study presents a comparative analysis of two image enhancement techniques, Continuous Wavelet Transform (CWT) and Fast Fourier Transform (FFT), in the context of improving the clarity of high-quality 3D seismic d... This study presents a comparative analysis of two image enhancement techniques, Continuous Wavelet Transform (CWT) and Fast Fourier Transform (FFT), in the context of improving the clarity of high-quality 3D seismic data obtained from the Tano Basin in West Africa, Ghana. The research focuses on a comparative analysis of image clarity in seismic attribute analysis to facilitate the identification of reservoir features within the subsurface structures. The findings of the study indicate that CWT has a significant advantage over FFT in terms of image quality and identifying subsurface structures. The results demonstrate the superior performance of CWT in providing a better representation, making it more effective for seismic attribute analysis. The study highlights the importance of choosing the appropriate image enhancement technique based on the specific application needs and the broader context of the study. While CWT provides high-quality images and superior performance in identifying subsurface structures, the selection between these methods should be made judiciously, taking into account the objectives of the study and the characteristics of the signals being analyzed. The research provides valuable insights into the decision-making process for selecting image enhancement techniques in seismic data analysis, helping researchers and practitioners make informed choices that cater to the unique requirements of their studies. Ultimately, this study contributes to the advancement of the field of subsurface imaging and geological feature identification. 展开更多
关键词 continuous Wavelet Transform (CWT) Fast Fourier Transform (FFT) reservoir Characterization Tano Basin Seismic Data Spectral Decomposition
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Introduction of geomechanical restoration method and its implications for reservoir assessment of unconventional oil-gas resource in China
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作者 Lining wang 《Chinese Journal of Population,Resources and Environment》 2013年第4期327-332,共6页
New technologies are in urgent need of unconventional hydrocarbon exploration and development in China.This paper provides a brief introduction and analysis of a new three-dimensional(3D)geomechanical restoration meth... New technologies are in urgent need of unconventional hydrocarbon exploration and development in China.This paper provides a brief introduction and analysis of a new three-dimensional(3D)geomechanical restoration method developed in recent years.After an in-depth discussion on the technical principle and specific characteristics of the fields,we designed a feasible workflow for two oil-gas fields with great unconventional oil-gas resource potentials in China(Weiyuan and Jiulongshan oil-gas fields of Sichuan).After discussing the major challenges and limitations of the new technology,we also suggest its research efforts and future application prospect It is shown that the new technology will be an effective method to facilitate the exploration and development of unconventional oil and gas resources in China. 展开更多
关键词 geomechanical RESTORATION reservoir prediction UNCONVENTIONAL oil-gas RESOURCES new WORKFLOW
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Hydrocarbon Vertical Continuity Evaluation in the Cretaceous Reservoirs of Azadegan Oilfield, Southwest of Iran: Implications for Reservoir Geochemistry 被引量:2
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作者 Bahram ALIZADEH Mehrab RASHIDI +2 位作者 Alireza ZARASVANDI Seyed Rasoul SEYEDALI Mohammad Hasan ALIEE 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2020年第3期847-860,共14页
A collection of data obtained from analytical methods in geochemistry along with the reservoir engineering and geologic data were used to investigate the reservoir continuity in the Cretaceous Fahliyan, Gadavan, Kazhd... A collection of data obtained from analytical methods in geochemistry along with the reservoir engineering and geologic data were used to investigate the reservoir continuity in the Cretaceous Fahliyan, Gadavan, Kazhdumi and Sarvak reservoirs of the super-giant Azadegan oilfield, SW Iran. The geochemical data indicate that the oil samples, with medium to high level of thermal maturity, have been generated from the anoxic marine marl/carbonate source rock(s). The Sargelu(Jurassic) and Garau(Cretaceous) formations are introduced as the main source rocks for the studied oils. The dendrogram obtained from the cluster analysis of high-resolution gas chromatography data introduces two main oil groups including Fahliyan reservoir, and Kazhdumi along with Sarvak/Gadvan reservoirs. This is confirmed by C7 Halpern star diagram, indicating that, the light oil fraction from Fahliyan reservoir is distinct from the others. Also, different pressure gradient of the Fahliyan Formation(over-pressured) relative to other reservoirs(normally-pressured) show the presence of compartments. The relation between toluene/n-heptane and n-heptane/methylcyclohexane represents the compartmentalization due to maturation/evaporative fractionation for Fahliyan and water washing for other studied reservoirs. Also, the impermeable upper part of the Fahliyan Formation and thin interbedded shaly layers in the Kazhdumi, Sarvak and Gadvan formations have controlled reservoir compartmentalization. 展开更多
关键词 reservoir continuity geochemistry pressure gradient oil-oil correlation Azadegan oilfield Abadan Plain
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Geochemical Assessment and Lateral Reservoir Continuity of Asmari Reservoir Oils in the Cheshmeh-Khush Oilfield,SW Iran
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作者 Farid TEZHEH Bijan BEIRANVAND +2 位作者 Hormuz GHALAVAND Mohammad Reza KAMALI Rahim BAGHERI TIRTASHI 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2020年第5期1562-1573,共12页
A total of 6 oil samples were systematically selected from six Asmari Reservoir wells in the Cheshmeh-Khush Oilfield for geochemical evaluation of the hydrocarbon system,based on reservoir geochemistry and oil fingerp... A total of 6 oil samples were systematically selected from six Asmari Reservoir wells in the Cheshmeh-Khush Oilfield for geochemical evaluation of the hydrocarbon system,based on reservoir geochemistry and oil fingerprints.An investigation of the distribution patterns of normal alkanes and tricyclic and tetracyclic terpanes along with characteristic biomarkers of the depositional environment and sedimentary facies,indicated that the source rock of the studied hydrocarbons was deposited in a reducing aquatic environment with a low input of terrigenous material and predominantly carbonate lithology derived from organic algal matter.The studied oil samples exhibited moderate maturity,as was further confirmed by the parameters extracted from the light hydrocarbons.Statistical clustering based on different biomarker parameters indicated the presence of two oil families.Additionally,the application of branched and cyclic compounds in the light hydrocarbons(C5–C11)to evaluate lateral continuity of the Asmari reservoir further supported the presence of the two oil families.Other evidence proved the presence of a NE–SW trending fault separating wells X5 and X6 from the other wells in the field.In other wells across the field,good lateral reservoir continuity was observed,despite the presence of faults on the northern and southern plunges of the structure. 展开更多
关键词 oil fingerprint lateral continuity Asmari reservoir petroleum families Cheshmeh-Khush Oilfield
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Analysis of a Typical Case of Meteorological Service in Tangpu Reservoir
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作者 Quan SHAN Yuxin DING +2 位作者 Tingting GU Jinxin WANG Kai TANG 《Meteorological and Environmental Research》 2024年第2期44-47,共4页
The continuous rainy precipitation process from February to March in 2019 was selected to analyze the effect of meteorological service in Tangpu Reservoir basin,so as to sum up service experience and then lay a better... The continuous rainy precipitation process from February to March in 2019 was selected to analyze the effect of meteorological service in Tangpu Reservoir basin,so as to sum up service experience and then lay a better foundation for subsequent services.In response to the rainy weather from December 2018 to early 2019,three rounds of flood discharge were carried out in Tangpu Reservoir.During February-March in 2019,the hit rate of short-term area rainfall forecast for Tangpu Reservoir was 80.0%.Compared with the median of forecast interval,the average absolute error was 7.6 mm,and the relative error was 32.7%.The large deviation in the forecast from March 27 to 28 was deeply analyzed,and it is found that the main reasons were excessive reliance on and trust in a single model,insufficient correction of the actual situation,and insufficient judgment of the nature of precipitation.For the future reservoir meteorological service,three aspects of thinking were put forward,such as further strengthening the sharing of hydrological and meteorological information,improving the forecasting ability,and deepening the research of runoff forecast models. 展开更多
关键词 Tangpu reservoir Meteorological service continuous rain Analysis of a typical case
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A review and research on comprehensive characterization of microscopic shale gas reservoir space 被引量:5
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作者 Yu-ru Yang Xiao-chen Liu +12 位作者 Hui Zhang Gang-yi Zhai Jiao-dong Zhang Zhi-fang Hu Shu-jing Bao Cong Zhang Xiang-hua Wang Xiao Yang Zheng-zhuang Liu Ting Xie Juan Chen Liyu Fang Li-juan Qin 《China Geology》 2019年第4期541-556,共16页
In this paper,substantial domestic and foreign research results of microscopic shale reservoir space were systemically reviewed,the research history consisting of simple observation and qualitative classification,quan... In this paper,substantial domestic and foreign research results of microscopic shale reservoir space were systemically reviewed,the research history consisting of simple observation and qualitative classification,quantitative research,the combination of qualitative and quantitative research successively as well as the characteristics of each research stage were summarized.In addition,the current problems existing in the characterization methods of shale reservoir space were also analyzed.Furthermore,based on massive actual detection of typical core samples obtained from more than 50 global shale gas wells and relevant practical experience,a comprehensive characterization method of combining qualitative with the semiquantitative characterization was put forward.In detail,the indicators of the qualitative characterization include pore combination type and organic-matter microscopic morphology type,while the core elements of the semi-quantitative characterization include the percentage of the organic-matter area and the plane porosity of the pores of different types.Based on the reference of the naming and classification of rocks,the three-end-member diagram method was used to characterize microscopic shale reservoir space.This is achieved by plotting the three end-member diagram of 3 kinds of first-order critical reservoir spaces,i.e.,organic-matter pores,matrix pores,and micro-fractures,in order to intuitively present the features of the microscopic pore combination.Meanwhile,statistic histograms of organic-matter microscopic morphology type and the plane porosity of different types of pores were adopted to characterize the development degree of second-order pores quantitatively.By this comprehensive characterization method,the importance of both pore combination and the microscopic morphology of organic matter were emphasized,revealing the control of organic-matter microscopic morphology over the organic-matter pores.What is more,high-resolution FE-SEM was adopted to obtain semi-quantitative statistics results.In this way,the features of pore development and pore combination were quantified,not only reflecting the types and storage capacity of the microscopic shale reservoir space,but also presenting the hydrocarbongenerating potential of organic matter in shale.Therefore,the results of this research are capable of providing in-depth microscopic information for the assessment and exploration and development of shale gas resources. 展开更多
关键词 SHALE SHALE gas reservoir space RESEARCH status Types of PORE COMBINATIONS oil-gas exploration engineering Longmaxi FORMATION Niutitang FORMATION Shahejie FORMATION Yanchang FORMATION China USA
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Coupling relationship between reservoir diagenesis and hydrocarbon accumulation in Lower Cretaceous Yingcheng Formation of Dongling,Changling fault depression,Songliao Basin,Northeast China 被引量:1
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作者 Yun-qian Lu You-lu Jiang +2 位作者 Wei Wang Jian-feng Du Jing-dong Liu 《China Geology》 2020年第2期247-261,共15页
The Lower Cretaceous Yingcheng Formation in the southern Songliao Basin is the typical tight oil sandstone in China.In order to better predict the petrophysical properties of the tight sandstone reservoirs in the Lowe... The Lower Cretaceous Yingcheng Formation in the southern Songliao Basin is the typical tight oil sandstone in China.In order to better predict the petrophysical properties of the tight sandstone reservoirs in the Lower Cretaceous Yingcheng Formation,Songliao Basin,Northeast China,the diagenesis and porosity evolution was investigated using a suite of petrographic and geochemical techniques including thin section analysis,scanning electron microscopy,mercury intrusion and fluid inclusion analysis,on a set of selected tight sandstone samples.Combined with the histories of burial evolution,organic matter thermal evolution and hydrocarbon charge,the matching relationship between reservoir porosity evolution and hydrocarbon accumulation history is analyzed.The result showed that the tight sandstone reservoirs characterized of being controlled by deposition,predominated by compaction,improved by dissolution and enhanced by cementation.The hydrocarbon accumulation period was investigated using a suite of hydrocarbon generation and expulsion history,microfluorescence determination and temperature measurement technology.According to the homogenization temperature of the inclusions and the history of burial evolution,Yingcheng Formation has mainly two phases hydrocarbon accumulation.The first phase of oil and gas is charged before the reservoir is tightened,the oil and gas generated by Shahezi source rocks enter the sand body of Yingcheng Formation,influenced by the carrying capability of sand conducting layer,oil and gas is mainly conducted by the better properties and higher connectivity sand body and enriched in the east,which belongs to the type of densification after hydrocarbon accumulation.The second phase of oil and gas charge after densification,which belongs to the type of densification before the hydrocarbon accumulation. 展开更多
关键词 Diagenetic evolution Fluid inclusion Porosity recovery reservoir quality Hydrocarbon charging periods Dongling area oil-gas exploration engineering Songliao Basin Heilongjiang Province China
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Evaluation of reservoir environment by chemical properties of reservoir water‒A case study of Chang 6 reservoir in Ansai oilfield,Ordos Basin,China
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作者 Zhi-bo Zhang Ying Xu +4 位作者 Di-fei Zhao Hao-ming Liu Wei-cheng Jiang Dan-ling Chen Teng-rui Jin 《China Geology》 CAS CSCD 2023年第3期443-454,共12页
The Ordos Basin is the largest continental multi-energy mineral basin in China,which is rich in coal,oil and gas,and uranium resources.The exploitation of mineral resources is closely related to reservoir water.The ch... The Ordos Basin is the largest continental multi-energy mineral basin in China,which is rich in coal,oil and gas,and uranium resources.The exploitation of mineral resources is closely related to reservoir water.The chemical properties of reservoir water are very important for reservoir evaluation and are significant indicators of the sealing of reservoir oil and gas resources.Therefore,the caprock of the Chang 6 reservoir in the Yanchang Formation was evaluated.The authors tested and analyzed the chemical characteristics of water samples selected from 30 wells in the Chang 6 reservoir of Ansai Oilfield in the Ordos Basin.The results show that the Chang 6 reservoir water in Ansai Oilfield is dominated by calcium-chloride water type with a sodium chloride coefficient of generally less than 0.5.The chloride magnesium coefficients are between 33.7 and 925.5,most of which are greater than 200.The desulfurization coefficients range from 0.21 to 13.4,with an average of 2.227.The carbonate balance coefficients are mainly concentrated below 0.01,with an average of 0.008.The calcium and magnesium coefficients are between 0.08 and 0.003,with an average of 0.01.Combined with the characteristics of the four-corner layout of the reservoir water,the above results show that the graphics are basically consistent.The study indicates that the Chang 6 reservoir in Ansai Oilfield in the Ordos Basin is a favorable block for oil and gas storage with good sealing properties,great preservation conditions of oil and gas,and high pore connectivity. 展开更多
关键词 Oil and gas reservoir water SALINITY Calcium-chloride water Carbonate balance coefficient Oil-bearing reservoir prediction GEOCHEMISTRY Chang 6 reservoir oil-gas exploration engineering Ansai Oilfield Ordos Basin
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基于连续小波变换的黑北凹地砂砾储卤层沉积特征研究 被引量:1
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作者 侯献华 王伟 +5 位作者 郑绵平 皮晨 樊馥 苏奎 李洪普 高雪峰 《地质学报》 EI CAS CSCD 北大核心 2024年第10期2956-2967,共12页
柴达木盆地西部中深层“砂砾型”钾盐储卤层与沉积水体变化息息相关,高密度网状二维地震资料包含的频率信息,有助于识别发育砂砾储卤层的沉积环境,为深层富钾卤水储层研究提供支撑。采用连续小波变换时频分析技术将地震信号从一维的时... 柴达木盆地西部中深层“砂砾型”钾盐储卤层与沉积水体变化息息相关,高密度网状二维地震资料包含的频率信息,有助于识别发育砂砾储卤层的沉积环境,为深层富钾卤水储层研究提供支撑。采用连续小波变换时频分析技术将地震信号从一维的时间域拓展到二维的时间-频率域上,能够在频谱中更清晰地刻画沉积体内部岩性组合的旋回结构特征。基于正演数据和实际钻井数据,总结了低水位体系域、水进体系域、高水位体系域和水退体系域层序框架下,沉积体的地震时频谱旋回响应特征:低水位体系域的时频谱能量主要聚集在低频,高水体系域的时频谱能量主要聚集在高频,水进体系域的时频谱能量随时间减小向高频方向移动,水退体系域的时频谱能量随时间减小向低频方向移动,指出35 Hz是划分有利沉积旋回——水退体系域末期、低水位体系域和水进体系域初期的频率阈值。选择合适频率区间重构地震数据能突出弱振幅砂砾层的反射特征,结合全频带数据有助于快速识别有利沉积旋回,为寻找砂砾型深层卤水钾矿提供依据。 展开更多
关键词 砂砾储卤层 连续小波变换 时频谱特征 沉积旋回 黑北凹地
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致密砂岩气藏与页岩气藏展布模式
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作者 戴金星 董大忠 +7 位作者 倪云燕 龚德瑜 黄士鹏 洪峰 张延玲 刘全有 吴小奇 冯子齐 《石油勘探与开发》 EI CAS CSCD 北大核心 2024年第4期667-678,共12页
在阐述美国和中国致密砂岩气和页岩气资源潜力和年产量的基础上,系统梳理致密砂岩气藏与页岩气藏展布的研究沿革,分析页岩气藏、致密砂岩气藏展布特征及致密砂岩气成因类型。研究表明:(1)美国致密砂岩气在天然气总产量中占比由2008年的... 在阐述美国和中国致密砂岩气和页岩气资源潜力和年产量的基础上,系统梳理致密砂岩气藏与页岩气藏展布的研究沿革,分析页岩气藏、致密砂岩气藏展布特征及致密砂岩气成因类型。研究表明:(1)美国致密砂岩气在天然气总产量中占比由2008年的35%降至2023年的8%左右;美国页岩气2023年产量为8310×10^(8)m^(3),在天然气总产量中占比由2000—2008年的5%~17%升至2023年的70%以上。(2)中国致密砂岩气占天然气总产量比例由2010年的16%升至2023年的28%以上;2012年中国开始生产页岩气,2023年产量达250×10^(8)m^(3),约占天然气全国总产量的11%。(3)页岩气藏展布模式为连续型,根据页岩气藏是否有断层切割及断距与气层厚度的关系,连续型页岩气藏可分为连续式和断续式两种。(4)与以往大部分学者认为致密砂岩气藏展布模式为连续型的认识不同,致密砂岩气藏展布模式不是连续型;根据圈闭类型,致密砂岩气藏可分为岩性型、背斜型和向斜型3种。(5)中国3大克拉通盆地和埃及Obavied次盆的致密砂岩气为煤成气,美国阿巴拉契亚盆地和阿曼迦巴盐盆地的致密砂岩气为油型气。 展开更多
关键词 页岩气 致密砂岩气 气藏特征 连续型成藏 岩性型成藏 背斜型成藏 向斜型成藏 煤成气 油型气
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南流江预应力连续梁式渡槽抗震性能
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作者 刘惠娟 赖成联 +1 位作者 姜士博 谢开仲 《南水北调与水利科技(中英文)》 CAS CSCD 北大核心 2024年第S01期196-203,共8页
预应力连续梁式渡槽具有整体受力条件好、施工工艺成熟且方便的优势,在实际工程中运用广泛,其具有良好的抗震性能是保证工程安全运行的关键。以采用预应力连续梁式渡槽形式的南流江大渡槽为例,通过Midas-civil分析软件建立有限元模型并... 预应力连续梁式渡槽具有整体受力条件好、施工工艺成熟且方便的优势,在实际工程中运用广泛,其具有良好的抗震性能是保证工程安全运行的关键。以采用预应力连续梁式渡槽形式的南流江大渡槽为例,通过Midas-civil分析软件建立有限元模型并施加拟合生成的地震波,对渡槽的抗震性能进行研究。结果表明,在拟合生成的地震波与场地类别、分区特征周期相近的人工地震波E1、E2作用下,南流江大渡槽的顺桥向及横桥向的桥墩强度验算和变形均满足要求,具有安全可靠的抗震性能。 展开更多
关键词 南流江大渡槽 预应力连续梁式渡槽 抗震性能 数值计算 水库
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考虑历史洪水资料的三峡水库运行期非一致性设计洪水估算 被引量:1
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作者 谢雨祚 郭生练 +3 位作者 熊立华 王俊 钟斯睿 杨媛婷 《水利学报》 EI CSCD 北大核心 2024年第6期643-653,共11页
水利水电工程规划设计采用单站的天然年最大洪水系列资料和P-Ⅲ型适线法推求设计洪水,确定水库特征水位。然而上游水库的建成运行,破坏了下游洪水资料系列的一致性假定。本文通过构建非一致性洪水频率分析时变矩模型,计算了长江上游重... 水利水电工程规划设计采用单站的天然年最大洪水系列资料和P-Ⅲ型适线法推求设计洪水,确定水库特征水位。然而上游水库的建成运行,破坏了下游洪水资料系列的一致性假定。本文通过构建非一致性洪水频率分析时变矩模型,计算了长江上游重点水库群的水库系数;并根据连续型随机变量分布函数单调递增的特性,提出了基于Q-Q图的时变P-Ⅲ型适线法;推求出考虑历史洪水资料的三峡水库运行期非一致性设计洪水,并与极大似然法的估算成果进行比较。结果表明:①水库系数作为时变P-Ⅲ型分布的协变量,可以反映洪水系列的非一致性变化规律;②时变P-Ⅲ型适线法侧重考虑历史洪水点据的拟合,拟合效果优于极大似然法;③相较原设计成果,三峡水库运行期1000年一遇设计洪峰Q m、洪量W 3d和W 7d削减18%左右,洪量W 15d和W 30d削减14%左右,长江上游水库群的调蓄作用直接影响三峡水库运行期的防洪库容和特征水位。 展开更多
关键词 设计洪水 非一致性 不连序系列 时变矩法 水库系数 P-Ⅲ型适线法 极大似然法 三峡水库
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乐滩灌区工程红水河渡槽的建设条件和结构型式设计
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作者 胡本勇 郭业水 《广西水利水电》 2024年第6期48-52,共5页
红水河渡槽是桂中治旱乐滩灌区南干渠通水攻坚的关键节点,渡槽受总干渠自流输水的水力特性限制,渠首设计水位较低,渡槽下的航道通航净高要求不小于8 m,建设条件复杂。通过拱架式和连续刚构式两种方案的比较,选择连续刚构式渡槽方案,不... 红水河渡槽是桂中治旱乐滩灌区南干渠通水攻坚的关键节点,渡槽受总干渠自流输水的水力特性限制,渠首设计水位较低,渡槽下的航道通航净高要求不小于8 m,建设条件复杂。通过拱架式和连续刚构式两种方案的比较,选择连续刚构式渡槽方案,不仅节约了工程投资,也提高了工程实施的安全可靠性。采用双幅大跨度矮墩扁平叠箱变截面连续刚构型式,将承载结构和过水槽身有效结合,在广西水利工程中尚属首例,是全国首座大跨低墩连续刚构跨河渡槽。 展开更多
关键词 红水河渡槽 连续刚构式渡槽 安全可靠性 乐滩灌区 桂中治旱
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缝洞型碳酸盐岩油藏注氮气提高采收率技术
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作者 佘治成 陈利新 +2 位作者 徐三峰 肖云 张键 《西南石油大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第4期138-148,共11页
哈拉哈塘奥陶系油藏是典型的缝洞型碳酸盐岩油藏,岩溶储层发育,储层储渗空间主要由大小不等的溶洞、溶蚀孔洞和裂缝组成,宏观上离散,局部连续,储集体空间多尺度,缝洞体空间形态及分布复杂。水驱是这类油藏最主要的开发方式,经过15 a开发... 哈拉哈塘奥陶系油藏是典型的缝洞型碳酸盐岩油藏,岩溶储层发育,储层储渗空间主要由大小不等的溶洞、溶蚀孔洞和裂缝组成,宏观上离散,局部连续,储集体空间多尺度,缝洞体空间形态及分布复杂。水驱是这类油藏最主要的开发方式,经过15 a开发,注水失效单井和单元逐年增多,水驱失效后,注气成为缝洞型碳酸盐岩油藏提高采收率的最重要手段,注气提高采收率技术在哈拉哈塘进行了现场试验和推广应用,并且建立了6因素注气选井标准,从岩溶背景、井储关系、钻揭深度、储量规模、生产动态及剩余油类型等6个方面选井,依据注气时机、注气方式、注气量、焖井时间及指示曲线等5个方面进行注气参数设计,取得了一些注气选井原则和注气参数设计的初步认识,以期为缝洞型碳酸盐岩油藏注气开发提供参考。 展开更多
关键词 岩溶储层 局部连续 水驱失效 注气提高采收率 注气参数
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渤海特高孔渗储层控水防砂一体化完井技术 被引量:3
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作者 张辉 谭绍栩 +3 位作者 霍通达 赵成龙 周战凯 裴柏林 《石油钻探技术》 CAS CSCD 北大核心 2024年第1期107-113,共7页
渤海BN油田的特高孔渗疏松砂岩油藏储层非均质性强,生产井出水、出砂问题严重,而现有各自独立设计实施的控水和防砂工艺存在设计实施繁琐、控水防砂效果差等问题。为此,在连续封隔体控水完井技术的基础上,根据地质工程一体化的思路,给... 渤海BN油田的特高孔渗疏松砂岩油藏储层非均质性强,生产井出水、出砂问题严重,而现有各自独立设计实施的控水和防砂工艺存在设计实施繁琐、控水防砂效果差等问题。为此,在连续封隔体控水完井技术的基础上,根据地质工程一体化的思路,给出了优选连续封隔体颗粒粒径、设计ICD筛管控流强度及优化配置ICD筛管的方法,形成了适用于渤海特高孔渗储层的防砂控水一体化完井技术。BN油田3口井进行了控水防砂一体化完井技术试验,与邻井相比,单井无水采油期平均延长187 d,初期含水率远低于预期含水率,井口无砂时间明显增长,其中BN-D4H1井井口无砂时间长达889 d。现场试验结果表明,防砂控水一体化完井技术可以满足BN油田控水、防砂的双重需求。 展开更多
关键词 海上油田 特高孔渗储层 控水 防砂 连续封隔体 完井 ICD筛管
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黄河百年径流系列连续枯水段识别和用水特征分析
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作者 尚文绣 王煜 +1 位作者 郑小康 李晓宇 《人民黄河》 CAS 北大核心 2024年第6期20-25,42,共7页
连续枯水给黄河流域水资源安全造成了严重威胁。采用黄河干流兰州断面和花园口断面1920—2019水文年系列,通过距平法和标准化径流指数识别了百年系列连续枯水段,分析了枯水段的用水特征。结果显示:两断面均经历了1922—1932水文年和1990... 连续枯水给黄河流域水资源安全造成了严重威胁。采用黄河干流兰州断面和花园口断面1920—2019水文年系列,通过距平法和标准化径流指数识别了百年系列连续枯水段,分析了枯水段的用水特征。结果显示:两断面均经历了1922—1932水文年和1990—2002水文年连续枯水段,均表现出连续枯水段和极端枯水年叠加的特征;1990—2002水文年连续枯水显著减少了入海水量;在1990—2002水文年连续枯水段初期,枯水对黄河流域及供水区用水量影响不明显,但在后期用水总量及农业用水量均大幅度减少;1990—2002水文年连续枯水段后期遭遇短期极端枯水对用水造成重大影响;龙羊峡水库在连续枯水段发挥了多年调节作用,支撑了流域供水安全。但是龙羊峡水库年际补水能力有限,未来在国家水网建设背景下,应通过建设古贤水库和跨流域调水工程提升应对连续枯水的流域水资源安全保障能力。 展开更多
关键词 连续枯水段 极端枯水 用水特征 入海水量 多年调节水库 黄河
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