期刊文献+
共找到26篇文章
< 1 2 >
每页显示 20 50 100
TOC estimation from logging data using principal component analysis 被引量:2
1
作者 Yaxiong Zhang Gang Wang +3 位作者 Xindong Wang Haitao Fan Bo Shen Ke Sun 《Energy Geoscience》 2023年第4期1-8,共8页
Total organic carbon(TOC)content is one of the most important parameters for characterizing the quality of source rocks and assessing the hydrocarbon-generating potential of shales.The Lucaogou Formation shale reservo... Total organic carbon(TOC)content is one of the most important parameters for characterizing the quality of source rocks and assessing the hydrocarbon-generating potential of shales.The Lucaogou Formation shale reservoirs in the Jimusaer Sag,Junggar Basin,NW China,is characterized by extremely complex lithology and a wide variety of mineral compositions with source rocks mainly consisting of carbonaceous mudstone and dolomitic mudstone.The logging responses of organic matter in the shale reservoirs is quite different from those in conventional reservoirs.Analyses show that the traditional△logR method is not suitable for evaluating the TOC content in the study area.Analysis of the sensitivity characteristics of TOC content to well logs reveals that the TOC content has good correlation with the separation degree of porosity logs.After a dimension reduction processing by the principal component analysis technology,the principal components are determined through correlation analysis of porosity logs.The results show that the TOC values obtained by the new method are in good agreement with that measured by core analysis.The average absolute error of the new method is only 0.555,much less when compared with 1.222 of using traditional△logR method.The proposed method can be used to produce more accurate TOC estimates,thus providing a reliable basis for source rock mapping. 展开更多
关键词 Total organic carbon Principal component analysis Separation degree Source rocks Shale oil
下载PDF
Anisotropy measurements and characterization of the Qingshankou shale
2
作者 Li Qing-feng Yan Xue-hong +5 位作者 Yan Wei-lin Ren Li Wang Peng Han Jian-qiang Xia Xue Chen Hao 《Applied Geophysics》 SCIE CSCD 2024年第3期468-478,617,共12页
Qingshankou shale(Gulong area,China)exhibits strong acoustic anisotropy characteristics,posing significant challenges to its exploration and development.In this study,the five full elastic constants and multipole resp... Qingshankou shale(Gulong area,China)exhibits strong acoustic anisotropy characteristics,posing significant challenges to its exploration and development.In this study,the five full elastic constants and multipole response law of the Qingshankou shale were studied using experimental measurements.Analyses show that the anisotropy parametersϵandγin the study region are greater than 0.4,whereas the anisotropy parameterδis smaller,generally 0.1.Numerical simulations show that the longitudinal and transverse wave velocities of these strong anisotropic rocks vary significantly with inclination angle,and significant differences in group velocity and phase velocity are also present.Acoustic logging measures the group velocity in dipped boreholes;this differs from the phase velocity to some extent.As the dip angle increases,the longitudinal and SH wave velocities increase accordingly,while the qSV-wave velocity initially increases and then decreases,reaching its maximum value at a dip of approximately 40°.These results provide an effective guide for the correction and modeling of acoustic logging time differences in the region. 展开更多
关键词 Transverse isotropy anisotropy parameter sonic logging group velocity phase velocity
下载PDF
Processing of array sonic logging data with nulti-scale STC technique 被引量:10
3
作者 Tao Guo He Fengjiang Yue Wenzheng Chen Ping 《Petroleum Science》 SCIE CAS CSCD 2008年第3期238-241,共4页
It is desirable to develop new signal processing techniques for effectively extracting reflected waves under the strong interferences of borehole guided waves. We presented a multi-scale semblance method for the separ... It is desirable to develop new signal processing techniques for effectively extracting reflected waves under the strong interferences of borehole guided waves. We presented a multi-scale semblance method for the separation and velocity (slowness) analysis of the reflected waves and guided waves in borehole acoustic logging. It was specially designed for the newly developed tools with ultra-long source- receiver spacing for acoustic reflection survey. This new method was a combination of the dual tree com- plex wavelets transform (DT-CWT) and the slowness travel time coherence (STC) method. Applications to the 3D finite difference (FD) modeling simulated data and to the field array sonic waveform signals have demonstrated the ability of this method to appropriately extract the reflected waves under severe interference from the guided waves and to suppress noise in the time-frequency domain. 展开更多
关键词 Borehole acoustic logging signal processing wavelet transform reflection survey
下载PDF
Application of multipole array sonic logging to acid hydralic fracturing 被引量:4
4
作者 Tao Guo Gao Kun +1 位作者 Wang Bing Ma Yong 《Applied Geophysics》 SCIE CSCD 2007年第2期133-137,共5页
Multipole array sonic logging tools have widely been employed in Chinese oilfields in recent years. We have developed a software package for rock mechanical analysis with multipole array sonic logs. This advanced data... Multipole array sonic logging tools have widely been employed in Chinese oilfields in recent years. We have developed a software package for rock mechanical analysis with multipole array sonic logs. This advanced data processing method and software have been applied to the Tahe oilfield in Northern West China to provide guidance to acid hydraulic fracturing design and evaluation. In this paper, we present the field examples of such data processing and applications to demonstrate the validity and advantages of our method and software package. 展开更多
关键词 Sonic log in-situ stress acid fracturing anisotropy measurement
下载PDF
Construction of well logging knowledge graph and intelligent identification method of hydrocarbon-bearing formation 被引量:1
5
作者 LIU Guoqiang GONG Renbin +4 位作者 SHI Yujiang WANG Zhenzhen MI Lan YUAN Chao ZHONG Jibin 《Petroleum Exploration and Development》 CSCD 2022年第3期572-585,共14页
Based on the well logging knowledge graph of hydrocarbon-bearing formation(HBF),a Knowledge-Powered Neural Network Formation Evaluation model(KPNFE)has been proposed.It has the following functions:(1)extracting charac... Based on the well logging knowledge graph of hydrocarbon-bearing formation(HBF),a Knowledge-Powered Neural Network Formation Evaluation model(KPNFE)has been proposed.It has the following functions:(1)extracting characteristic parameters describing HBF in multiple dimensions and multiple scales;(2)showing the characteristic parameter-related entities,relationships,and attributes as vectors via graph embedding technique;(3)intelligently identifying HBF;(4)seamlessly integrating expertise into the intelligent computing to establish the assessment system and ranking algorithm for potential pay recommendation.Taking 547 wells encountered the low porosity and low permeability Chang 6 Member of Triassic in the Jiyuan Block of Ordos Basin,NW China as objects,80%of the wells were randomly selected as the training dataset and the remainder as the validation dataset.The KPNFE prediction results on the validation dataset had a coincidence rate of 94.43%with the expert interpretation results and a coincidence rate of 84.38%for all the oil testing layers,which is 13 percentage points higher in accuracy and over 100 times faster than the primary conventional interpretation.In addition,a number of potential pays likely to produce industrial oil were recommended.The KPNFE model effectively inherits,carries forward and improves the expert knowledge,nicely solving the robustness problem in HBF identification.The KPNFE,with good interpretability and high accuracy of computation results,is a powerful technical means for efficient and high-quality well logging re-evaluation of old wells in mature oilfields. 展开更多
关键词 well logging hydrocarbon bearing formation identification knowledge graph graph embedding technique intelligent identification neural network
下载PDF
A method of monitoring gas saturation in carbon dioxide injection heavy oil reservoirs by pulsed neutron logging technology 被引量:1
6
作者 FAN Jilin ZHANG Feng +5 位作者 TIAN Lili LIANG Qixuan ZHANG Xiaoyang FANG Qunwei LU Baoping LI Xianghui 《Petroleum Exploration and Development》 CSCD 2021年第6期1420-1429,共10页
A method is proposed to characterize the fast neutron scattering cross-section ( s f) quantitatively by the combina-tion of inelastic gamma rays and captured gamma rays, so as to realize the gas saturation evaluation ... A method is proposed to characterize the fast neutron scattering cross-section ( s f) quantitatively by the combina-tion of inelastic gamma rays and captured gamma rays, so as to realize the gas saturation evaluation of CO_(2)-injected heavy oilreservoirs based on the three-de tector pulsed neutron logging technology. Factors influencing of the evaluation effect of thismethod are analyzed and the effectiveness of this method is verified by a simulation example. By using the Monte Carlo simu-lation method and the physical model of bulk-volume rock, the relationship between s f and CO_(2) saturation is studied, and thesaturation interpretation model is established. The influences of formation temperature and pressure, heavy oil density, bore-hole fluid and reservoir methane content on the evaluation results of CO_(2) saturation are analyzed. The results show that thecharacterization of s f by the combination of secondary gamma information can eliminate the influence of formation lithology,borehole fluid and methane content are the main factors affecting the quantitative monitoring of CO_(2) saturation, and the ef-fects of formation temperature and pressure and heavy oil density are negligible. The simulation example verified the feasibilityof the method for evaluating the CO_(2) saturation of CO_(2)-injected heavy oil reservoirs. 展开更多
关键词 CO_(2)flooding gas saturation heavy oil re servoir pulsed neutron logging fast neutron scattering cross-section secondary gamma-ray Monte Carlo simulation
下载PDF
Petroleum geological features and hydrocarbon enrichment of Linhe Depression in Hetao Basin, NW China
7
作者 ZHANG Ruifeng HE Haiqing +8 位作者 ZHU Qingzhong CHEN Shuguang LIU Xiheng DAN Weining HU Yanxu SHI Yulei ZHANG Yufei YU Haijun ZHANG Ximeng 《Petroleum Exploration and Development》 SCIE 2023年第4期798-811,共14页
Based on paleogeomorphology, drilling and seismic data, this paper systematically studies the structural and sedimentary evolution, source rock characteristics, reservoir characteristics and formation mechanism, hydro... Based on paleogeomorphology, drilling and seismic data, this paper systematically studies the structural and sedimentary evolution, source rock characteristics, reservoir characteristics and formation mechanism, hydrocarbon accumulation model and enrichment law in the Linhe Depression of the Hetao Basin, NW China. The Hetao Basin mainly experienced three stages of evolution, namely, weak extensional fault depression, strong extensional fault depression and strike-slip transformation, giving rise to four positive structural belts(Jilantai, Shabu, Nalinhu and Xinglong), which are favorable areas for oil and gas accumulation. The two main saline lacustrine source rocks, Lower Cretaceous Guyang Formation and Oligocene Linhe Formation, are characterized by high sulfur content, rich algae, early maturity, early expulsion, and wide oil generation window. The large structural transition belt in the intermountain area around the Hetao Basin controls the formation of large-scale braided river delta deposits, which are characterized by high quartz content(50%-76%), long-term shallow burial and weak compaction, low cement content, and good reservoir properties in delta front sandbody. The burial depth of the effective Paleogene reservoirs is predicted to reach 8000 m. Three hydrocarbon accumulation models, nose-uplift near sag, buried hill surrounding sag, fault nose near source rock, are constructed. The law of hydrocarbon accumulation in the Linhe Depression is finally clarified as follows: near-source around the depression is the foundation, high-quality thick reservoir is the premise, good tectonic setting and trap conditions are the key. 展开更多
关键词 Hetao Basin Linhe Depression Cretaceous Guyang Formation Paleogene Linhe Formation Jilantai Oilfield Bayan Oilfield hydrocarbon enrichment law
下载PDF
Temporal variations in geochemistry of hydraulic fracturing fluid and flowback water in a tight oil reservoir
8
作者 Jie Tian Liang Wang +3 位作者 Li-Pin Ni Li-Wei Mou Shu-Te Su Mehdi Ostadhassan 《Petroleum Science》 SCIE EI CSCD 2023年第5期3013-3021,共9页
Hydraulic fracturing facilitates the development and exploitation of unconventional reservoirs.In this study,the injected hydraulic fracturing fluid(HFF)and flowback and produced water(FPW)in tight oil reservoirs of t... Hydraulic fracturing facilitates the development and exploitation of unconventional reservoirs.In this study,the injected hydraulic fracturing fluid(HFF)and flowback and produced water(FPW)in tight oil reservoirs of the Lucaogou Formation in the Junggar Basin are temporally sampled from day 1 to day 64.Freshwater is used for fracturing,and HFF is obtained.The chemical and isotopic parameters(including the water type,total salinity,total dissolved solids(TDS),pH,concentrations of Na^(+),Cl^(-),Ba^(+),K^(+),Fe^(2+)+Fe^(3+),and CO_(3)^(2-),dD,and δ^(18)O)are experimentally obtained,and their variations with time are systematically analyzed based on the flowback water.The results show that the water type,Na/Cl ratio,total salinity,and TDS of the FPW change periodically primarily due to the HFF mixing with formation water,thus causing δD and δ^(18)O to deviate from the meteoric water line of Xinjiang.Because of watererock interaction(WRI),the concentrations of Fe^(2+)+Fe^(3+)and CO_(3)^(2-)of the FPW increase over time,with the solution pH becoming more alkaline.Furthermore,based on the significant changes observed in the geochemistry of the FPW,three separate time intervals of flowback time are identified:Stage Ⅰ(<10 days),where the FPW is dominated by the HFF and the changes in ions and isotopes are mainly caused by the WRI;Stage Ⅱ(10-37 days),where the FPW is dominated by the addition of formation water to the HFF and the WRI is weakened;and finally,Stage Ⅲ(>37 days),where the FPW is dominated by the chemistry of the formation water.The methodology implemented in this study can provide critical support for the source identification of formation water. 展开更多
关键词 Tight oil reservoirs ISOTOPE Flowback and produced water(FPW) Inorganic ions Hydraulic fracturing fluid(HFF)
下载PDF
Identification of the anomaly component using BEMD combined with PCA from element concentrations in the Tengchong tin belt, SW China 被引量:7
9
作者 Yongqing Chen Lina Zhang Binbin Zhao 《Geoscience Frontiers》 SCIE CAS CSCD 2019年第4期1561-1576,共16页
Concentration of elements or element groups in a geological body is the result of multiple stages of rockforming and ore-forming geological processes.An ore-forming element group can be identified by PCA(principal com... Concentration of elements or element groups in a geological body is the result of multiple stages of rockforming and ore-forming geological processes.An ore-forming element group can be identified by PCA(principal component analysis)and be separated into two components using BEMD(bi-dimensional empirical mode decomposition):(1)a high background component which represents the ore-forming background developed in rocks through various geological processes favorable for mineralization(i.e.magmatism,sedimentation and/or metamorphism);(2)the anomaly component which reflects the oreforming anomaly that is overprinted on the high background component developed during mineralization.Anomaly components are used to identify ore-finding targets more effectively than ore-forming element groups.Three steps of data analytical procedures are described in this paper;firstly,the application of PCA to establish the ore-forming element group;secondly,using BEMD on the o re-forming element group to identify the anomaly components created by different types of mineralization processes;and finally,identifying ore-finding targets based on the anomaly components.This method is applied to the Tengchong tin-polymetallic belt to delineate ore-finding targets,where four targets for Sn(W)and three targets for Pb-Zn-Ag-Fe polymetallic mineralization are identified and defined as new areas for further prospecting.It is shown that BEMD combined with PCA can be applied not only in extracting the anomaly component for delineating the ore-finding target,but also in extracting the residual component for identifying its high background zone favorable for mineralization from its oreforming element group. 展开更多
关键词 Bi-dimensional empirical mode decomposition(BEMD) Principal COMPONENT analysis(PCA) ANOMALY components ORE-FORMING ELEMENT groups Sn(W)and Pb-Zn-Ag-Fe POLYMETALLIC deposits Tengchong tin-polymetallic BELT
下载PDF
Hydrocarbon Generation Kinetic Characteristics from Different Types of Organic Matter 被引量:4
10
作者 WANG Min LU Shuangfang +4 位作者 XUE Haitao WANG Weiming LIU Min DONG Qi WANG Guihua 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2011年第3期702-711,共10页
In order to contrast the hydrocarbon generation kinetic characteristics from different types of organic matter(OM),18 samples from different basins were pyrolyzed using Rock-Eval-Ⅱapparatus under the open system.Fr... In order to contrast the hydrocarbon generation kinetic characteristics from different types of organic matter(OM),18 samples from different basins were pyrolyzed using Rock-Eval-Ⅱapparatus under the open system.From the experimental results,the curve of hydrocarbon generation rate vs.temperature can be easily obtained,which usually can be used to optimize kinetic parameters (A,E,F)of the hydrocarbon generation model.In this paper,the parallel first-order reaction with a single frequency factor model is selected to describe the hydrocarbon generation kinetic characteristics. The hydrocarbon generation kinetic parameters reveal that the types of compound structures and chemical bonds of the lacustrine fades typeⅠOM are relatively homogeneous,with one dominating activation energy.The types of chemical bonds of the lacustrine facies typeⅡ2 OM and the terrestrial facies typeⅢOM are relative complex,with a broad activation energy distribution,and the reaction fraction of the preponderant activation energy drops with the decrease of hydrogen index.The impact of the activation energy distribution spaces on the geological extrapolation of kinetic parameters is also investigated.The results show that it has little effect on the hydrocarbon transformation ratio(TR)and therefore,the parallel first-order reaction model with proper number of activation energies can be better used to describe the hydrocarbon generation process.The geological extrapolation results of 18 samples of kinetic parameters show that the distribution range of the hydrocarbon generation rate of the typeⅠOM is relatively narrow and the hydrocarbon generation curve is smooth.In comparison,the distribution range of the hydrocarbon generation for typeⅢand typeⅡ2-ⅢOM are quite wide,and the hydrocarbon generation curves have fluctuation phenomena.The distribution range of the hydrocarbon generation rate and the fluctuation phenomena are related to the kinetic parameters of OM;the narrower the activation energy distribution,the narrower the hydrocarbon generation rate distribution,and the smoother the hydrocarbon generation curve,and vice versa. 展开更多
关键词 kinetic characteristics simulation experiment type of organic matter activation energy hydrocarbon generation rate
下载PDF
A new method for reservoir fluid identification 被引量:2
11
作者 Yue Wenzheng Tao Guo 《Applied Geophysics》 SCIE CSCD 2006年第2期124-129,共6页
The wavelet transform (WT) method has been employed to decompose an original geophysical signal into a series of components containing different information about reservoir features such as pore fluids, lithology, a... The wavelet transform (WT) method has been employed to decompose an original geophysical signal into a series of components containing different information about reservoir features such as pore fluids, lithology, and pore structure. We have developed a new method based on WT energy spectra analysis, by which the signal component reflecting the reservoir fluid property is extracted. We have successfully processed real log data from an oil field in central China using this method. The results of the reservoir fluid identification agree with the results of well tests. 展开更多
关键词 wavelet transform energy spectrum analysis reservoir fluid identification and electrical well-logging
下载PDF
Self-adaptively inpainting gaps between electrical image pads according to the image fabric 被引量:2
12
作者 Zhang Zhao-hui Deng Jing +1 位作者 Chen Hua-yong Yu Hong-guo 《Applied Geophysics》 SCIE CSCD 2020年第5期823-833,903,904,共13页
Images created from measurements made by wireline microresistivity imaging tools have longitudinal gaps when the well circumference exceeds the total width of the pad-mounted electrode arrays.The gap size depends on t... Images created from measurements made by wireline microresistivity imaging tools have longitudinal gaps when the well circumference exceeds the total width of the pad-mounted electrode arrays.The gap size depends on the tool design and borehole size,and the null data in these gaps negatively aff ect the quantitative evaluation of reservoirs.Images with linear and texture features obtained from microresistivity image logs have distinct dual fabric features because of logging principles and various geological phenomena.Linear image features usually include phenomena such as fractures,bedding,and unconformities.Contrarily,texture-based image features usually indicate phenomena such as vugs and rock matrices.According to the characteristics of this fabric-based binary image structure and guided by the practice of geological interpretation,an adaptive inpainting method for the blank gaps in microresistivity image logs is proposed.For images with linear features,a sinusoidal tracking inpainting algorithm based on an evaluation of the validity and continuity of pixel sets is used.Contrarily,the most similar target transplantation algorithm is applied to texture-based images.The results obtained for measured electrical imaging data showed that the full borehole image obtained by the proposed method,whether it was a linear structural image refl ecting fracture and bedding or texture-based image refl ecting the matrix and pore of rock,had substantially good inpainting quality with enhanced visual connectivity.The proposed method was eff ective for inpainting electrical image logs with large gaps and high angle fractures with high heterogeneity.Moreover,ladder and block artifacts were rare,and the inpainting marks were not obvious.In addition,detailed full borehole images obtained by the proposed method will provide an essential basis for interpreting geological phenomena and reservoir parameters. 展开更多
关键词 electrical image logging binary structure image inpainting self-adaptively fabric guiding
下载PDF
Numerical simulation of non-Archie electrophysical property of saturated rock with lattice Boltzmann method 被引量:2
13
作者 Yue Wenzheng Tao Guo +1 位作者 Liu Dongming Yang Wendu 《Petroleum Science》 SCIE CAS CSCD 2009年第1期24-28,共5页
The electrophysical property of saturated rocks is very important for reservoir identification and evaluation. In this paper, the lattice Boltzmann method (LBM) was used to study the electrophysical property of rock... The electrophysical property of saturated rocks is very important for reservoir identification and evaluation. In this paper, the lattice Boltzmann method (LBM) was used to study the electrophysical property of rock saturated with fluid because of its advantages over conventional numerical approaches in handling complex pore geometry and boundary conditions. The digital core model was constructed through the accumulation of matrix grains based on their radius distribution obtained by the measurements of core samples. The flow of electrical current through the core model saturated with oil and water was simulated on the mesoscopic scale to reveal the non-Archie relationship between resistivity index and water saturation (I-Sw). The results from LBM simulation and laboratory measurements demonstrated that the I-Sw relation in the range of low water saturation was generally not a straight line in the log-log coordinates as described by the Archie equation. We thus developed a new equation based on numerical simulation and physical experiments. This new equation was used to fit the data from laboratory core measurements and previously published data. Determination of fluid saturation and reservoir evaluation could be significantly improved by using the new equation. 展开更多
关键词 Non-Archie relation digital core model lattice Boltzmann method numerical simulation rock physical experiment
下载PDF
Prestack inversion identification of organic reef gas reservoirs of Permian Changxing Formation in Damaoping area, Sichuan Basin, SW China 被引量:2
14
作者 ZHOU Lu ZHONG Feiyan +6 位作者 YAN Jiachen ZHONG Kexiu WU Yong XU Xihui LU Peng ZHANG Wenji LIU Yi 《Petroleum Exploration and Development》 2020年第1期89-100,共12页
Organic reef reservoirs in the platform margin of Kaijiang-Liangping trough in Damaoping area, Sichuan Basin are thin in single layer, fast in lateral variation, and have small P-impedance difference from the surround... Organic reef reservoirs in the platform margin of Kaijiang-Liangping trough in Damaoping area, Sichuan Basin are thin in single layer, fast in lateral variation, and have small P-impedance difference from the surrounding rock, it is difficult to identify and predict the reservoirs and fluid properties by conventional post-stack inversion. Through correlation analysis of core test data and logging P-S wave velocity, this work proposed a formula to calculate the shear wave velocity in different porosity ranges, and solved the issue that some wells in the study area have no S-wave data. AVO forward analysis reveals that formation porosity is the main factor affecting the variation of AVO type, the change of water saturation cannot affect the AVO type, but it has an effect on the change range of AVO. Through cross-plotting analysis of elastic parameters, it is found that fluid factor is a parameter sensitive to gas-bearing property of organic reef reservoir in the study area. By comparing results of post-stack impedance inversion, post-stack high frequency attenuation property, pre-stack simultaneous inversion and AVO anomaly analysis of angle gathers, it is found that the gas-bearing prediction of organic reef reservoirs by using fluid factor derived from simultaneous pre-stack inversion had the highest coincidence rate with actual drilling data. At last, according to the characteristics of fluid factor distribution, the favorable gas-bearing area of the organic reef reservoir in Changxing Formation was predicted, and the organic reef trap at the top of Changxing Formation in Block A of Damaoping area was sorted out as the next exploration target. 展开更多
关键词 Sichuan Basin PERMIAN Changxing Formation ORGANIC REEF PRESTACK inversion S-WAVE estimation rock physics fluid factor gas detection
下载PDF
Investigation of image segmentation effect on the accuracy of reconstructed digital core models of coquina carbonate 被引量:1
15
作者 Wang Hai-Tao Wang Li +1 位作者 Lai Fu-Qiang Zhang Jin-Yan 《Applied Geophysics》 SCIE CSCD 2020年第4期501-512,共12页
Digital core models reconstructed using X-ray tomography(X-CT)enable the quantitative characterization of the pore structure in three dimensions(3D)and the numerical simulation of petrophysics.When the X-CT images acc... Digital core models reconstructed using X-ray tomography(X-CT)enable the quantitative characterization of the pore structure in three dimensions(3D)and the numerical simulation of petrophysics.When the X-CT images accurately reflect the micro structures of core samples,the greyscale threshold in the image segmentation determines the accuracy of digital cores and the simulated petrophysical properties.Therefore,it is vital to investigate the comparison parameter for determining the key greyscale threshold and the criterion to describe the accuracy of the segmentation.Representative coquina digital core models from X-CT are used in this work to study the impact of grayscale threshold on the porosity,pore percolation,connectivity and electrical resistivity of the pore scale model and these simulations are calculated by Minkowski functions,component labeling and fi nite element method,respectively,to quantify the pore structure and simulate electrical resistivity.Results showed that the simulated physical properties of the digital cores,varied with the gradual increase of the greyscale threshold.Among the four parameters related to the threshold,the porosity was most sensitive and chose as the comparison parameter to judge the accuracy of the greyscale threshold.The variations of the threshold change the micro pore structures,and then the electrical resistivity.When the porosity of the digital core model is close to the experimental porosity,the simulated porosity exponent matches the experimental porosity exponents well.The good agreement proved that the porosity is the critical comparison parameter to describe the accuracy of image segmentation.The criterion is that the porosity of the digital core after segmentation should be close to the experimental porosity. 展开更多
关键词 Porous media X-CT image segmentation digital core electrical resistivity simulation
下载PDF
LOG-IQ与EILOG补偿声波在青海油田的对比及应用
16
作者 吕云霞 罗开平 《内江科技》 2009年第9期18-18,共1页
针对测井解释中利用到的时差曲线,对AC与BCAS两种声波仪器进行了对比,针对AC与BCAS的基本情况分析了各自的优缺点,并用实例对比分析了AC与BCAS在地区的应用情况,发现AC与BCAS比较适合青海油田复杂的地区使用,在应用中都有着很好的重复... 针对测井解释中利用到的时差曲线,对AC与BCAS两种声波仪器进行了对比,针对AC与BCAS的基本情况分析了各自的优缺点,并用实例对比分析了AC与BCAS在地区的应用情况,发现AC与BCAS比较适合青海油田复杂的地区使用,在应用中都有着很好的重复性、稳定性和相关性,并指出了在实际应用过程中存在的问题,给出了相应的解决方法。 展开更多
关键词 时差曲线 声波仪器 重复性 稳定性 相关性
下载PDF
Time for China to Increase Oil Stockpile
17
作者 Tian Wenxin 《China Oil & Gas》 CAS 2008年第4期32-33,共2页
People still remembered the New Year of 2008 brought with it a new record for oil–it traded at more than US$100 per barrel.
关键词 石油储备 时间 原油价格 石油价格 石油企业 美元
下载PDF
Footsteps along the Belt and Road
18
作者 Luo Yi 《China Oil & Gas》 CAS 2017年第3期39-41,共3页
Within CNPC Logging Company Limited,there are groups of people living in foreign countries who are,with their loyalty and sweat,performing the sacred task of exploring gas and oil reserves for overseas petroleum compa... Within CNPC Logging Company Limited,there are groups of people living in foreign countries who are,with their loyalty and sweat,performing the sacred task of exploring gas and oil reserves for overseas petroleum companies.They illuminate a vast,spectacular world with their passion and enthusiasm–they are the people contributing to the Belt and Road Initiative,working on overseas well logging projects.I gained a preliminary understanding of 展开更多
关键词 石油测井 石油储备 石油公司 天然气 海外
下载PDF
Anwar's Journey of China
19
作者 Ma Yongzhong 《China Oil & Gas》 CAS 2018年第2期33-35,共3页
Mr.Sakirov Anwar,an Uzbek who works for the International Affair Division of CNPC Logging Co.,LTD(CNLC),is from the Farby Street of Almaza District in the capital city Tashkent.He was CNLC's first foreign employee... Mr.Sakirov Anwar,an Uzbek who works for the International Affair Division of CNPC Logging Co.,LTD(CNLC),is from the Farby Street of Almaza District in the capital city Tashkent.He was CNLC's first foreign employee and participated in its very first project in Uzbekistan.For years,he had been longing for an opportunity to go to China to pay a visit to the company that had hired him. 展开更多
关键词 中国 旅行 乌兹别克 CNPC
下载PDF
Visit to Uliaanbaatar
20
作者 Huang Jianzhuang 《China Oil & Gas》 CAS 2018年第4期39-41,共3页
About two years ago, I, together with colleagues from the international business division, journeyed to our mysterious inland neighbour, Mongolia, with a view to expand the oil well logging market there.Prior to this ... About two years ago, I, together with colleagues from the international business division, journeyed to our mysterious inland neighbour, Mongolia, with a view to expand the oil well logging market there.Prior to this adventure, I had pictured Mongolia in my imagination as an ancient country, closed and backward,home to nomadic people, with fearless herdsmen galloping away over the rolling prairies and open plains dotted with Mongolian yurts known as gers.In recent years, a large number of coal, oil and metal mines cnnstructed in Mongolia have attracted 展开更多
关键词 石油测井行业 市场分析 发展现状 石油化工行业
下载PDF
上一页 1 2 下一页 到第
使用帮助 返回顶部