期刊文献+
共找到209篇文章
< 1 2 11 >
每页显示 20 50 100
The sedimentary record of the Sanshui Basin:Implication to the Late Cretaceous tectonic evolution in the northern margin of South China Sea
1
作者 Zhe ZHANG Nianqiao FANG Zhen SUN 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2023年第2期532-549,共18页
Whether the South China continental margin had shifted from active subduction to passive extension in the Late Cretaceous remains controversial.Located in the northernmost of the South China Sea continental margin,San... Whether the South China continental margin had shifted from active subduction to passive extension in the Late Cretaceous remains controversial.Located in the northernmost of the South China Sea continental margin,Sanshui Basin developed continuous stratigraphy from Lower Cretaceous to Eocene and provides precious outcrops to study the regional tectonic evolution during the Cretaceous.Therefore,we conducted field observations,petrology,clay mineralogy,geochemistry,and detrital zircon chronology analyses of sedimentary rocks from the Upper Cretaceous Sanshui Formation in Sanshui Basin.Results suggest that the Sanshui Basin is characterized as an intermoutane basin with multiple provenances,strong hydrodynamic environment,and proximal accumulation in the Late Cretaceous.An angular unconformity at the boundary between the Lower and Upper Cretaceous was observed in the basin.The sedimentary facies of the northern basin changed from lacustrine sedimentary environment in the Early Cretaceous to alluvial facies in the Late Cretaceous.The zircon U-Pb ages of granitic gravelly sandstone from Sanshui Formation prominently range from 100 Ma to 300 Ma,which is close to the deposition age of Sanshui Formation.The major and trace elements of the Late Cretaceous sedimentary samples show characteristics of active continental margin,and are different from the Paleogene rifting sequences.Hence,we propose that the northern South China Sea margin underwent an intense tectonic uplift at the turn of the Early and Late Cretaceous(around 100 Ma).Afterward,the northern South China Sea margin entered a wide extension stage in the Late Cretaceous(~100 to~80 Ma).This extensional phase is related to the back-arc extension in the active continental margin environment,which is different from the later passive rifting in the Cenozoic.The transition from active subduction to passive extension in the northern South China Sea may occur between the late Late Cretaceous and the Paleogene. 展开更多
关键词 continental margin South China Sea Sanshui basin Late Cretaceous tectonic transition
下载PDF
The Permian-Triassic Transitional Zone: Jordan, Arabian Plate;Linked to Siberian Large Igneous Province and Neo-Tethys Breakup Degassing via Climate Forcing, Atmospheric Hazard and Metal Toxicity
2
作者 Werner Schneider Elias Salameh 《Open Journal of Geology》 2022年第6期472-503,共32页
End-Permian Gondwana siliciclastics (50 - 70 m) of the Um Irna F exposed along the NE Dead Sea, exhibit carbonate-free fining upward cycles (FUC) deposited during acid flash flood events under tropical climate. Severa... End-Permian Gondwana siliciclastics (50 - 70 m) of the Um Irna F exposed along the NE Dead Sea, exhibit carbonate-free fining upward cycles (FUC) deposited during acid flash flood events under tropical climate. Several ferruginous paleosol intercalations cover periods of drying upward formation (DUP) under semiarid/arid climates. Thin grey pelite beds interbedded between paleosol and overlying FUC, are interpreted as tephra deposits sourced in Siberian LIP- and Neo-Tethys (NT)-Degassing. The Wadi Bassat en Nimra-section exhibits the P-T transitional zone where flash flood deposits meet supra-/intertidal sediments of the southward-directed transgressive NT. Decreasing flash-flooding continued through the Lower Scythian (Ma’in F.) during transgression, reworking, and resedimentation. Two euryhaline foraminifera-bearing limestone beds are discussed as indicators for the end of mass extinction (recovery phase: ca. 250.8 - 250.4 Ma) possibly correlating with the Maximum Flooding Surface MFS Tr 10 (ca. 250.5 Ma) on the Arabian Shelf (Khuff cycles B;A). Comparable data from the Germanic Basin as FUC/DUP-cycles, tephrasuspicious “Grey Beds” with high concentrations of As, Co, Pb, Zn, and Cu as well as the U-Pb Age data of the Siberian LIP meet the PTB-Zone between the MFSs Intervals P 40 (ca. 254 Ma)/Tr 10 (ca 250.5 Ma) on the Arabian Shelf. MFS (Tr 10, 20, 30) and SBs resp. on the Arabian Plate, as well as Scythian Substage boundaries correlate with &#8706<sup>13</sup> C-excursions recorded at Musandam, UAE. Thereby, the ratio of greenhouse gases (+climate forcing)/aerosols und tephra (-climate forcing) takes a significant influence on the &#8706<sup>13</sup>C-Variation. 展开更多
关键词 P-T transition zone JORDAN Arabian Plate SILICICLASTICS Flash Flood Deposits Neo-Tethys Transgression Siberian LIP Degassing: Acid Rain Tuffs Metal Toxcicity Climate Forcing Milankovitch Croll Cycles Germanic basin (Correlation) Earth/Moon Interplay Self-Regulation (Autopoiesis)
下载PDF
Structural Architecture for Development of Marginal Extensional Sub-Basins in the Red Sea Active Rift Zone
3
作者 Reda Amer Mohamed Sultan +1 位作者 Robert Ripperdan John Encarnación 《International Journal of Geosciences》 2012年第1期133-152,共20页
This paper presents a robust kinematic model that describes northern Red Sea and Gulf of Suez rifting and the development of marginal extensional half-graben sub-basins (ESB). A combination of Landsat Enhanced Themati... This paper presents a robust kinematic model that describes northern Red Sea and Gulf of Suez rifting and the development of marginal extensional half-graben sub-basins (ESB). A combination of Landsat Enhanced Thematic Mapper Plus (ETM+) and structural data was used to provide model constraints on the development of rift segments and ESB in the active rift zones. Structural analysis shows rotation and change in strike of rift-bounding faults. The model describes the northern Red Sea region as a poly-phase rift system initiated by late Oligocene (30 - 24 Ma) orthogonal rifting and the development of marginal ESB (now inland ESB), followed by oblique rifting and flank uplift during the early Miocene (24 - 18 Ma). The oblique rifting fragmented the rift depression into segments separated by oblique-slip accommodation within reactivated Pan-African (ca. 600 Ma) fracture zones, resulting in the development of antithetic faults and an en-echelon distribution of inland ESB. The current phase of rifting was instigated by the development of the Dead Sea Transform in response to increased northeasterly extension during the middle Miocene (ca. 18 Ma). The model explains the widening of the Red Sea rift during the last phase more than the Gulf of Suez rift by developing more antithetic faults and formation of offshore ESB, and deepening the rift depression. 展开更多
关键词 Remote Sensing TECTONIC Model marginAL Sub-basins RIFT zone Red SEA
下载PDF
The Research of the Activity of the Piedmont Fault on the Tangshankou Segment of the Yuguang Basin Southern Marginal Fault
4
作者 Wang Lin Tian Qinjian +1 位作者 Li Dewen Zhang Xiaoliang 《Earthquake Research in China》 CSCD 2017年第4期527-537,共11页
The Yuguang basin is a half-graben basin in the basin-range tectonic zone in northwest Beijing,located at the northern end of the Shanxi graben system,and the Yuguang basin southern marginal fault( YBSMF) controls the... The Yuguang basin is a half-graben basin in the basin-range tectonic zone in northwest Beijing,located at the northern end of the Shanxi graben system,and the Yuguang basin southern marginal fault( YBSMF) controls the formation of this basin. A linear fault escarpment has formed in the proluvial fan on the piedmont fault zone of the Tangshankou segment of YBSMF. A trench across this escarpment reveals three paleo-earthquake events on two active faults. One fault ruptured at about 9 ka for the first time,and then faulted again at about 7. 3 ka,causing the formation and synchronous activity of another fault.Finally,they faulted for the third time,but we cannot determine the faulting time due to the lack of relevant surface deposition. The accumulative vertical displacement of these three events is about 8. 1 m. We estimate that the average recurrence period of the piedmont fault is about 1. 7 ka,and the average slip rate of the piedmont fault is about1. 6 mm/a. We also estimate the reference magnitude of each event according to the empirical formula. 展开更多
关键词 Yuguang basin south marginAL FAULT PIEDMONT FAULT zone FAULT ESCARPMENT Trench PALEOEARTHQUAKE event FAULT slip rate
下载PDF
North slope transition zone of Songnan-Baodao sag in Qiongdongnan Basin and its control on medium and large gas fields,South China Sea
5
作者 XU Changgui YOU Li 《Petroleum Exploration and Development》 CSCD 2022年第6期1229-1242,共14页
Based on analysis of newly collected 3D seismic and drilled well data,the geological structure and fault system of Baodao sag have been systematically examined to figure out characteristics of the transition fault ter... Based on analysis of newly collected 3D seismic and drilled well data,the geological structure and fault system of Baodao sag have been systematically examined to figure out characteristics of the transition fault terrace belt and its control on the formation of natural gas reservoirs.The research results show that the Baodao sag has the northern fault terrace belt,central depression belt and southern slope belt developed,among them,the northern fault terrace belt consists of multiple transition fault terrace belts such as Baodao B,A and C from west to east which control the source rocks,traps,reservoirs,oil and gas migration and hydrocarbon enrichment in the Baodao sag.The activity of the main fault of the transition belt in the sedimentary period of Yacheng Formation in the Early Oligocene controlled the hydrocarbon generation kitchen and hydrocarbon generation potential.From west to east,getting closer to the provenance,the transition belt increased in activity strength,thickness of source rock and scale of delta,and had multiple hydrocarbon generation depressions developed.The main fault had local compression under the background of tension and torsion,giving rise to composite traps under the background of large nose structure,and the Baodao A and Baodao C traps to the east are larger than Baodao B trap.Multiple fault terraces controlled the material source input from the uplift area to form large delta sand bodies,and the synthetic transition belt of the west and middle sections and the gentle slope of the east section of the F12 fault in the Baodao A transition belt controlled the input of two major material sources,giving rise to a number of delta lobes in the west and east branches.The large structural ridge formed under the control of the main fault close to the hydrocarbon generation center allows efficient migration and accumulation of oil and gas.The combination mode and active time of the main faults matched well with the natural gas charging period,resulting in the hydrocarbon gas enrichment.Baodao A transition belt is adjacent to Baodao 27,25 and 21 lows,where large braided river delta deposits supplied by Shenhu uplift provenance develop,and it is characterized by large structural ridges allowing high efficient hydrocarbon accumulation,parallel combination of main faults and early cessation of faulting activity,so it is a favorable area for hydrocarbon gas accumulation.Thick high-quality gas reservoirs have been revealed through drilling,leading to the discovery of the first large-scale gas field in Baodo 21-1 of Baodao sag.This discovery also confirms that the north transition zone of Songnan-Baodao sag has good reservoir forming conditions,and the transition fault terrace belt has great exploration potential eastward. 展开更多
关键词 Qiongdongnan basin Songnan-Baodao sag fault transition zone PaleogeneBaodo 21-1 medium and large gas fields large structural ridge composite trap hydrocarbon gas
下载PDF
Intracontinental lithospheric delamination:Constraints from imaging the mantle transition zone beneath the southwestern part of the Sichuan Basin
6
作者 Fan YANG Juan LI +3 位作者 Sidan CHEN Yun CHEN Long LI Yinshuang AI 《Science China Earth Sciences》 SCIE EI CAS CSCD 2023年第10期2340-2352,共13页
The southwestern part of the Sichuan Basin(SW-SCB)is adjacent to the eastern Himalayan syntaxis.Affected by the Indo-Eurasian collision and subsequent intrusion of the Indian plate into the Eurasian plate during the C... The southwestern part of the Sichuan Basin(SW-SCB)is adjacent to the eastern Himalayan syntaxis.Affected by the Indo-Eurasian collision and subsequent intrusion of the Indian plate into the Eurasian plate during the Cenozoic,this region is ideal for the study of the tectonic evolution of the intracontinental lithosphere and the dynamic processes of deep and shallow structures.In this study,we applied the receiver function technique to the data obtained from a recently deployed high-density broadband seismic array across the Sichuan Basin and Sichuan-Yunnan block(SCB-SYB).We conducted a multi-frequency and multi-model correction analysis to image the structure of the mantle transition zone beneath this region.The results showed the660-km discontinuity gradually increasing in depth by 10-30 km beneath the western side of the Anninghe-Xiaojiang Fault,suggesting the presence of thermal anomalies caused by the subducted Indian plate from west to east.At the junction of the SCBSYB,the 410-km discontinuity exhibited a slight uplift of 5-10 km,while the 660-km discontinuity showed a significant depression of~30 km over a lateral range of~150 km.Based on previous surface GPS observation and dynamic numerical simulation studies,we suggest that the sharp lateral small-scale topography of this 660-km discontinuity beneath the SW-SCB may have resulted from dripping delamination of the lithosphere within the strain localization area.Furthermore,the aggregation of delaminated lithospheric material at the base of the 660-km discontinuity determines the regional topography of mantle transition zone discontinuities.In this study,we provided seismological evidence for the challenging detection of small-scale intracontinental lithosphere dripping delamination.Moreover,it provides a new view for studying deep and shallow dynamic processes in intracontinental regions with stress concentration resulting from plate/continental subduction and collision. 展开更多
关键词 Mantle transition zone Receiver function Southwestern part of the Sichuan basin Dripping lithospheric delamination Sichuan-Yunnan block
原文传递
New understandings on gas accumulation and major exploration breakthroughs in subsalt Ma 4 Member of Ordovician Majiagou Formation,Ordos Basin,NW China 被引量:3
7
作者 HE Haiqing GUO Xujie +6 位作者 ZHAO Zhenyu XI Shengli WANG Jufeng SONG Wei REN Junfeng WU Xingning BI He 《Petroleum Exploration and Development》 CSCD 2022年第3期489-501,共13页
Geological conditions and main controlling factors of gas accumulation in subsalt Ma 4 Member of Ordovician Majiagou Formation are examined based on large amounts of drilling,logging and seismic data.The new understan... Geological conditions and main controlling factors of gas accumulation in subsalt Ma 4 Member of Ordovician Majiagou Formation are examined based on large amounts of drilling,logging and seismic data.The new understandings on the control of paleo-uplift over facies,reservoirs and accumulations are reached:(1)During the sedimentary period of Majiagou Formation,the central paleo-uplift divided the North China Sea in central-eastern of the basin from the Qinqi Sea at southwest margin of the basin,and controlled the deposition of the thick hummocky grain beach facies dolomite on platform margin of Ma 4 Member.Under the influence of the evolution of the central paleo-uplift,the frame of two uplifts alternate with two sags was formed in the central-eastern part of the basin,dolomite of inner-platform beach facies developed in the underwater low-uplift zones,and marl developed in the low-lying areas between uplifts.(2)From the central paleo-uplift to the east margin of the basin,the dolomite in the Ma 4 Member gradually becomes thinner and turns into limestone.The lateral sealing of the limestone sedimentary facies transition zone gives rise to a large dolomite lithological trap.(3)During the late Caledonian,the basin was uplifted as a whole,and the central paleo-uplift was exposed and denuded to various degrees;high-quality Upper Paleozoic Carboniferous-Permian coal measures source rocks deposited on the paleo-uplift in an area of 60000 km^(2),providing large-scale hydrocarbon for the dolomite lithological traps in the underlying Ma 4 Member.(4)During the Indosinian-Yanshanian stage,the basin tilted westwards,and central paleo-uplift depressed into an efficient hydrocarbon supply window.The gas from the Upper Paleozoic source rock migrated through the high porosity and permeability dolomite in the central paleo-uplift to and accumulated in the updip high part;meanwhile,the subsalt marine source rock supplied gas through the Caledonian faults and micro-fractures as a significant supplementary.Under the guidance of the above new understandings,two favorable exploration areas in the Ma 4 Member in the central-eastern basin were sorted out.Two risk exploration wells were deployed,both revealed thick gas-bearing layer in Ma 4 Member,and one of them tapped high production gas flow.The study has brought a historic breakthrough in the gas exploration of subsalt Ma 4 Member of Ordovician,and opened up a new frontier of gas exploration in the Ordos Basin. 展开更多
关键词 Ordos basin ORDOVICIAN subsalt Majiagou Formation central paleo-uplift lithological transition zone gas accumulation Well Mitan1
下载PDF
渝东南复杂构造区常压页岩气地球物理勘探实践及攻关方向 被引量:1
8
作者 何希鹏 刘明 +7 位作者 薛野 李彦婧 何贵松 孟庆利 张勇 刘昊娟 蓝加达 杨帆 《物探与化探》 CAS 2024年第2期314-326,共13页
中国南方常压页岩气资源潜力大,主要分布于四川盆地周缘构造复杂区及盆外褶皱带,具有地表、地下双复杂地质条件,地震采集品质差、成像精度低、甜点参数变化规律不清。本文系统总结了渝东南地区常压页岩气地震采集、成像处理、储层预测... 中国南方常压页岩气资源潜力大,主要分布于四川盆地周缘构造复杂区及盆外褶皱带,具有地表、地下双复杂地质条件,地震采集品质差、成像精度低、甜点参数变化规律不清。本文系统总结了渝东南地区常压页岩气地震采集、成像处理、储层预测等方面的研究成果与技术进展:①形成了变密度三维观测系统设计技术、灰岩地表复杂山地地震激发接收技术,确保复杂地下构造反射波场充分采样,提升采集资料品质,提高施工效率。②完善了复杂山地地震叠前预处理技术、盆缘过渡带复杂构造成像技术、盆外褶皱带向斜构造成像技术,成果剖面信噪比高,有效频带宽,构造成像精度高。③基于岩石物理特征研究,实现优质页岩厚度、地层压力系数、脆性的定量预测;基于统计岩石物理,实现页岩有机碳含量、含气量、孔隙度的定量预测;利用有限元应力场模拟技术,揭示古应力场演化,实现多期构造改造叠加作用形成裂缝的定量预测;采用组合弹簧模型今应力场预测技术,明确今地应力场分布规律。通过攻关研究,有效指导了常压页岩气甜点预测与勘探开发,为南川常压页岩气田的发现提供了依据。下步应重点攻关基于5G无线节点接收的更加科学合理的地震采集技术、复杂山地高陡构造高精度自动化成像处理技术,以及“地质—工程—经济”一体化的甜点地震评价方法。 展开更多
关键词 常压页岩气 盆缘过渡带 盆外褶皱带 地震采集 成像处理 储层预测
下载PDF
新疆准噶尔盆地西北缘克拉玛依-乌尔禾断裂带推覆体上盘构造样式及影响因素
9
作者 张磊 白雨 +3 位作者 李梦瑶 王涛 马银山 杨亚洲 《地质通报》 CAS CSCD 北大核心 2024年第5期802-811,共10页
准噶尔盆地西北缘克拉玛依-乌尔禾断裂带(克-乌断裂带)及其周缘发现了大量的油气藏,尤其是推覆体上盘伴随着勘探程度及地质认识不断深化,已呈现出“百里油区”的态势。然而,受多期构造活动及断裂带内部复杂的岩性组合影响,石炭系内幕地... 准噶尔盆地西北缘克拉玛依-乌尔禾断裂带(克-乌断裂带)及其周缘发现了大量的油气藏,尤其是推覆体上盘伴随着勘探程度及地质认识不断深化,已呈现出“百里油区”的态势。然而,受多期构造活动及断裂带内部复杂的岩性组合影响,石炭系内幕地层构造样式展现出多种类型及复杂的空间展布样式,因此需要对构造样式及成因进一步探讨。综合地震和钻井资料,结合区域构造格局,梳理了准噶尔盆地西北缘克-乌断裂带上盘构造变形特征与影响因素;根据构造样式与推覆体内的岩性组合类型,将克-乌断裂带推覆体上盘划分出南段、中段和北段3个变形单元;明确了上盘石炭系5期主要构造阶段,分段恢复了推覆体上盘构造演化期次及样式。综合上述研究,认为克-乌断裂带上、下盘原始岩性组合关系是造成上盘石炭系内幕地层原始形变差异的主要因素,上盘石炭系内幕地层岩性组合差异是造成原生构造保存的主要因素。上述因素共同造成了圈闭条件沿克-乌断裂带自南向北变化。该研究为克-乌断裂带上盘油气勘探提供指导,同时也为类似条件地区的油气勘探提供借鉴。 展开更多
关键词 准噶尔盆地 克-乌断裂带 构造样式 构造演化 石炭系 油气勘探
下载PDF
塔里木盆地F_(Ⅰ)17走滑断裂北段奥陶纪差异变形机制
10
作者 蔡振忠 李兵 +4 位作者 罗枭 李会元 李梦勤 李正阳 王青红 《新疆石油地质》 CAS CSCD 北大核心 2024年第4期401-408,共8页
为明确走滑断裂对碳酸盐岩油气成藏的作用,基于三维地震资料,分析F_(Ⅰ)17走滑断裂北段的发育特征与构造变形过程,结合地质建模,开展走滑断裂形成及演化的砂箱物理模拟。研究区内的F_(Ⅰ)17走滑断裂可分为南、北2段,南段为近北东—南西... 为明确走滑断裂对碳酸盐岩油气成藏的作用,基于三维地震资料,分析F_(Ⅰ)17走滑断裂北段的发育特征与构造变形过程,结合地质建模,开展走滑断裂形成及演化的砂箱物理模拟。研究区内的F_(Ⅰ)17走滑断裂可分为南、北2段,南段为近北东—南西走向,主要发育雁列式断裂,奥陶纪一间房组整体以隆升为主,垂向上的变形幅度较大;北段为近北北东—南南西走向,主要发育线性走滑断裂,在奥陶纪一间房组变形微弱,局部地区可见地层微幅度下掉。砂箱物理模拟实验结果表明:线性走滑断裂的主位移带上会形成一系列隆起带,而走向偏转的走滑断裂在南段形成一系列隆起带,在北段则表现为地层下掉;在同一应力条件下,走滑断裂初始走向的差异会导致断裂受力发生变化,进而影响其演化过程。F_(Ⅰ)17走滑断裂南段的压隆段应力更加集中,局部裂缝和溶洞更发育,油气更为富集,油气勘探效果优于北段。 展开更多
关键词 塔里木盆地 阿满过渡带 奥陶纪 走滑断裂 差异变形机制 物理模拟
下载PDF
鄂尔多斯盆地西南缘断缝体油藏开发特征与潜力
11
作者 何发岐 李俊鹿 +3 位作者 高一龙 吴锦伟 白兴盈 高盾 《油气藏评价与开发》 CSCD 北大核心 2024年第5期667-677,F0002,共12页
鄂尔多斯盆地西南缘广泛发育不同规模断层和裂缝,极大地改善了致密储层渗流能力,形成了基质储层低渗透背景下的优质油藏类型——断缝体油藏,同时也加剧了油藏的非均质性和产能的差异性,给油藏内幕结构精细刻画和产能控制因素研究带来挑... 鄂尔多斯盆地西南缘广泛发育不同规模断层和裂缝,极大地改善了致密储层渗流能力,形成了基质储层低渗透背景下的优质油藏类型——断缝体油藏,同时也加剧了油藏的非均质性和产能的差异性,给油藏内幕结构精细刻画和产能控制因素研究带来挑战。充分运用断裂体系空间刻画、断裂分类分级和产能对比分析等方法,基于井-震-藏联合攻关进一步明确了断缝体油藏开发特征。建立了断缝体油藏“二元四区”模型,划分出断核破碎带、诱导裂缝带、微裂缝改造带、基质孔隙带等4个区带,其中断核破碎带是主要产量贡献单元。断层延伸长度越长、实钻构造位置越高,断核破碎带单井产能越高。诱导裂缝带距离断层越近,产能也越高。断缝体油井生产特征主要分为3个阶段:①断裂系统作为储集体的高产阶段;②断裂系统既作为储集体又同时发挥导流作用的储-导转化阶段;③裂缝主要发挥导流作用阶段。通过研究大幅提升了断缝体油藏高产井占比,同时对盆地西南缘中生界油藏高效滚动勘探开发部署具有重要的指导作用。 展开更多
关键词 鄂尔多斯盆地西南缘 断缝体油藏 “二元四区”模型 开发特征 高产富集规律
下载PDF
四川盆地川中—川西过渡带中侏罗统沙溪庙组致密砂岩相对优质储层成因机制 被引量:2
12
作者 宋林珂 刘四兵 +3 位作者 曾青高 周栋 唐大海 王锦西 《吉林大学学报(地球科学版)》 CAS CSCD 北大核心 2024年第2期371-388,共18页
川中—川西过渡带沙溪庙组天然气勘探潜力巨大,是四川盆地近几年勘探的热点。目前,制约沙溪庙组致密砂岩天然气勘探开发的问题较多,其中,“相对优质储层”的形成机理和综合预测是亟需解决的关键问题之一。针对这一科学问题,本次研究通... 川中—川西过渡带沙溪庙组天然气勘探潜力巨大,是四川盆地近几年勘探的热点。目前,制约沙溪庙组致密砂岩天然气勘探开发的问题较多,其中,“相对优质储层”的形成机理和综合预测是亟需解决的关键问题之一。针对这一科学问题,本次研究通过系统的物性分析、铸体薄片鉴定、扫描电镜分析以及储层地球化学分析等,开展了研究区沙溪庙组相对优质储层成因机制研究。研究结果表明:沙溪庙组致密砂岩以岩屑长石砂岩和长石岩屑砂岩为主。沙二段砂岩石英平均体积分数为35.27%,长石平均体积分数为35.37%,岩屑平均体积分数为29.36%,沙一段砂岩石英平均体积分数为37.79%,长石平均体积分数为24.01%,岩屑平均体积分数为38.20%,沙一段长石体积分数较高,沙二段岩屑体积分数较高。沙二段以变质岩岩屑为主(占岩屑体积分数的55%),沙一段则以岩浆岩岩屑为主(占岩屑体积分数的43%)。储层孔隙类型以原生孔为主,长石溶蚀孔为辅,沙一段具有相对更高比例的原生孔和裂隙孔。沙二段砂岩中38.00%的样品孔隙度大于12%,25.25%的样品渗透率大于1×10^(-3)μm^(2),沙一段砂岩仅3.09%的样品孔隙度大于12%,但41.22%的样品渗透率大于1×10^(-3)μm^(2)。总体表现为致密背景下发育一定的相对优质储层。其中沙二段储层孔隙度发育较好,而沙一段储层渗透性更佳,说明沙一段储层孔隙结构相对较好。沙溪庙组致密砂岩储层发育受控于岩矿组合-烃源体系-成岩系统。岩矿组合为成岩作用的演化提供物质基础,烃源体系决定溶蚀作用发育的强度,并为砂岩中主要自生矿物的沉淀提供必要的离子来源;成岩系统的开放程度则决定了体系内外离子的带进带出,进而影响了溶蚀作用和相应成岩产物的沉淀。沙二和沙一段砂岩岩矿组合的差异、沉积环境的不同、烃源体系以及成岩系统的开放程度是导致其成岩作用差异的主要原因。综上认为,高能沉积环境、早期保持性成岩作用(孔隙衬垫绿泥石)、多期次和多种类型的溶蚀作用以及局部微裂缝的发育改造,是研究区沙溪庙组相对优质储层发育的主要机制。 展开更多
关键词 川中—川西过渡带 沙溪庙组 致密砂岩 相对优质储层 成因机制 四川盆地
下载PDF
伊犁盆地南缘煤炭开发区水中放射性特征
13
作者 郭超 王忠阳 成建军 《世界核地质科学》 CAS 2024年第3期611-622,共12页
为了查清伊犁盆地南缘重点煤炭资源开发区放射性环境现状,同时为煤田安全开发与辐射污染防控提供基础数据。在系统收集以往铀矿水化学调查资料的基础上,通过对研究区内井水、泉水、河水、水文地质长期观测孔内水、生产矿区饮用水及铀矿... 为了查清伊犁盆地南缘重点煤炭资源开发区放射性环境现状,同时为煤田安全开发与辐射污染防控提供基础数据。在系统收集以往铀矿水化学调查资料的基础上,通过对研究区内井水、泉水、河水、水文地质长期观测孔内水、生产矿区饮用水及铀矿地浸采区地下水等水源采样分析其放射性活度浓度,初步了解了不同含水岩层中放射性核素的分布特征。本次调查共发现30个地下水铀异常点、10个地表水铀异常点、32个地下水氡异常点,划定地下水铀异常区9处、地表水铀异常区5处、地下水氡异常区11处;铀异常区主要分布在洪海沟—加格斯台、苏阿苏—达拉地一带,多位于铀矿床及其周边;氡异常区受矿床控制明显,个别受断层控制;煤矿排水中天然放射性核素浓度与全疆水平相当,生活饮用水中总α、总β符合生活饮用水卫生标准,但铀矿地浸采区地下水中总α、总β超标,不宜饮用。综合分析认为:研究区内铀异常、氡异常的形成多与附近铀矿化的发育存在密切关系,今后其附近地下水开发利用需要开展进一步的放射性环境评价。 展开更多
关键词 伊犁盆地南缘 重点煤炭开发区 水放射性
下载PDF
准噶尔盆地南缘西部山前褶皱—冲断带构造分带特征及形成演化
14
作者 姜颜良 孙文洁 +3 位作者 马文彧 张冠杰 吴孔友 孔雪 《东北石油大学学报》 CAS 北大核心 2024年第1期13-25,I0002,I0003,共15页
准噶尔盆地南缘西部构造呈新的构造叠置特征和复杂的复合叠加构造样式,叠加构造在空间分布上具有明显的分带特征。根据野外地质调查和地震解释资料,采用平衡剖面恢复、楔型构造理论和构造地质学分析方法,研究复杂叠加构造变形差异及分... 准噶尔盆地南缘西部构造呈新的构造叠置特征和复杂的复合叠加构造样式,叠加构造在空间分布上具有明显的分带特征。根据野外地质调查和地震解释资料,采用平衡剖面恢复、楔型构造理论和构造地质学分析方法,研究复杂叠加构造变形差异及分带特征。结果表明:准噶尔盆地南缘西部发育受基底卷入与顺层滑脱联合与差异控制下的空间断褶体系,褶皱发育受断层控制,褶皱与断层相互叠加形成构造楔、双重构造、突发构造等复合构造样式,表现为多期活动特征。研究区按构造变形性质及变形差异可划分为山前逆冲推覆构造带、基底卷入型褶皱—冲断带、盖层滑脱型褶皱—冲断带3个构造带;其中,基底卷入型褶皱—冲断带与第一排断褶带重合,受控于基底卷入型断裂体系,发育基底卷入式大型构造楔、背形堆垛式双重构造与前倾双重构造,背斜轴线与断层线平面重合度高;盖层滑脱型褶皱—冲断带包括第二和第三排断褶带,受控于顺层滑脱型断裂体系,发育断展褶皱,背斜轴线与断层线平面重合度低,构造垂向上具有分层差异,构造变形程度自南向北表现为由强至弱。挤压应力作用的时期和强度、滑脱断层的向北滑脱、构造楔的楔入长度及推挤距离、滑脱层的厚度和上覆地层厚度,以及沉积时代、沉积速率和岩性差异等因素是引起研究区构造垂向分层、南北分带的原因。该结果对明确研究区构造发育及下一步油气地质勘探具有指导意义。 展开更多
关键词 准噶尔盆地南缘西部 山前带 逆冲推覆构造带 褶皱—冲断带 构造样式 构造变形 分带特征 构造演化
下载PDF
大型走滑转换带对油气分布差异性控制作用: 以西非科特迪瓦盆地为例
15
作者 饶勇 程涛 +3 位作者 赵红岩 李全 吕彩丽 刘正 《地质科技通报》 CAS CSCD 北大核心 2024年第3期108-119,共12页
科特迪瓦盆地位于西非赤道段,发育大型走滑转换带,为典型的转换型被动陆缘盆地,是当前油气勘探热点区域,勘探潜力巨大,但油气平面分布、纵向富集均存在较大的差异性。基于前人研究,利用井、震资料并结合近年来新发现油气藏数据,重点从... 科特迪瓦盆地位于西非赤道段,发育大型走滑转换带,为典型的转换型被动陆缘盆地,是当前油气勘探热点区域,勘探潜力巨大,但油气平面分布、纵向富集均存在较大的差异性。基于前人研究,利用井、震资料并结合近年来新发现油气藏数据,重点从构造和沉积2个方面阐述了走滑转换带对油气分布差异性的控制作用。研究表明,盆地经历了陆内裂谷、洋陆转换和被动陆缘3个主要的构造-沉积演化阶段,形成了总体上“西窄东宽”的斧型构造格局特征,西部为陡窄转换边缘,东部为宽缓离散边缘,中部为过渡边缘,宏观上控制了油气“西少东多”的分布规律。走滑转换作用应力主要响应区为中部过渡边缘,中部隆起马尾带发育大量的构造圈闭,具有南北双向供烃特征,控制了北部凸起阿尔比构造油气藏的形成与分布。走滑转换作用形成的古地貌对转换早期上阿尔比-森诺曼和转换晚期土伦阶储层的空间展布特征均有重要的控制作用,内斜坡洼陷(盆地)往往是最为有利的富砂处,同时也是最有利的地层-岩性圈闭发育区,油气分布与沉积体系展布具有较好的一致性,即转换控储,分布控藏。 展开更多
关键词 科特迪瓦盆地 转换型被动陆缘盆地 走滑转换带 转换边缘 离散边缘 过渡边缘
下载PDF
甘肃省武威市东南部找煤前景分析
16
作者 王红霞 《中国煤炭地质》 2024年第3期1-5,共5页
河西走廊北祁连一带发育众多侏罗系小型聚煤盆地。前人研究了武威盆地石炭系发育自生自储式生储盖组合,但对侏罗系勘探研究程度较低。通过对武威市东南部一带侏罗纪古地理和后期构造特征的分析研究,认为研究区中侏罗世地层整体为湖沼泽... 河西走廊北祁连一带发育众多侏罗系小型聚煤盆地。前人研究了武威盆地石炭系发育自生自储式生储盖组合,但对侏罗系勘探研究程度较低。通过对武威市东南部一带侏罗纪古地理和后期构造特征的分析研究,认为研究区中侏罗世地层整体为湖沼泽相含煤碎屑岩建造,处于温暖潮湿的河流、沼泽及浅水湖泊相还原环境,具备中生代煤系沉积并保存下来的有利条件。根据研究区所处的构造单元及构造体系对成煤作用控制的特征,研究区所属构造单元的次一级隆起部位是今后开展找煤工作较为有利的地段。 展开更多
关键词 边缘拗陷 过渡型褶曲 次一级隆起 河西走廊侏罗系盆地
下载PDF
Crust-mantle transitional zone of Tianshan orogenic belt and Junggar Basin and its geodynamic implication 被引量:15
17
作者 赵俊猛 刘国栋 +2 位作者 卢造勋 张先康 赵国泽 《Science China Earth Sciences》 SCIE EI CAS 2001年第9期824-837,共14页
The traveling time of the reflection waves of each shot point from the crust-mantle transitional zone has been obtained by data processing using wavelet transform to the waves reflected from the crust-mantle transitio... The traveling time of the reflection waves of each shot point from the crust-mantle transitional zone has been obtained by data processing using wavelet transform to the waves reflected from the crust-mantle transitional zone. The crust-mantle transitional zone of the Xayar-Burjing geoscience transect can be divided into three sections: the northern margin of the Tarim Basin, the Tianshan orogenic belt and Junggar Basin. The crust-mantle transitional zone is composed mainly of first-order discontinuity in the Tarim Basin and the Junggar Basin, but in the Tianshan orogenic belt, it is composed of 7–8 thin layers which are 2-3 km in thickness and high and low alternatively in velocity, with a total thickness of about 20km. The discovery of the crust-mantle transitional zone of the Tianshan orogenic belt and Junggar Basin and their differences in tectonic features provide evidence for the creation of the geodynamic model “lithospheric subduction with intrusion layers in crust” for the Tianshan orogenic belt. 展开更多
关键词 wavelet transform Tianshan orogenic belt Junggar basin crust-mantle transitional zone
原文传递
四川盆地安岳气田震旦系台缘带和台内地区天然气成藏差异性及勘探领域 被引量:10
18
作者 李剑 杨春龙 +5 位作者 谢武仁 芮宇润 王晓波 张璐 谢增业 郭泽清 《石油与天然气地质》 EI CAS CSCD 北大核心 2023年第1期34-45,共12页
四川盆地安岳气田是中国迄今为止发现的最大规模的海相碳酸盐岩气田,探明天然气地质储量1.03×10^(12)m^(3),其中震旦系灯影组占56.3%。目前灯影组勘探开发主要围绕灯影组四段台缘带展开,且台缘带单井产能明显高于台内地区。基于台... 四川盆地安岳气田是中国迄今为止发现的最大规模的海相碳酸盐岩气田,探明天然气地质储量1.03×10^(12)m^(3),其中震旦系灯影组占56.3%。目前灯影组勘探开发主要围绕灯影组四段台缘带展开,且台缘带单井产能明显高于台内地区。基于台缘带和台内地区天然气地球化学特征及气藏对比关系,结合成藏条件分析,探讨其成藏差异性。研究表明:(1)灯影组台缘带较台内地区天然气甲烷氢同位素明显偏重,对应寒武系源岩古水体介质盐度高于震旦系,反映由台缘带到台内地区震旦系烃源岩贡献比例的增加;(2)台缘带与台内地区储层在岩石类型、储集空间等方面一致,但台缘带储层内部溶蚀孔洞发育程度强于台内地区,主要受控于丘滩发育程度和表生岩溶作用强度;(3)台缘带和台内地区成藏组合存在差异,台缘带紧邻裂陷内烃源岩,储层侧向对接烃源岩,存在旁生侧储、上生下储等多种成藏组合,而台内地区距裂陷内烃源岩较远,需要通过沟通油、源的断裂输导油气,成藏组合单一;(4)震旦系-寒武系烃源岩贡献比例的不同和优质储层发育位置及组合类型的差异,是导致台缘带和台内地区产能差异巨大的主要原因。川西北蓬莱—剑阁地区是未来深层灯影组台缘带的有利勘探领域,古隆起围斜部位台地内部构造-岩性气藏是灯影组台内地区主要有利勘探区。 展开更多
关键词 台内地区 台缘带 成藏差异 碳酸盐岩 寒武系 震旦系 安岳气田 四川盆地
下载PDF
四川盆地西部二叠系多期台缘带油气勘探潜力 被引量:10
19
作者 杨雨 文龙 +1 位作者 陈聪 汪华 《地学前缘》 EI CAS CSCD 北大核心 2023年第1期1-10,共10页
四川盆地西部二叠纪时期位于稳定克拉通边缘,受到海西运动、东吴运动和峨眉地裂运动的共同作用,发生构造-沉积分异。本文采用构造控盆、盆地控相、相控成藏要素组合的研究思路,在川西地区开展新一轮研究工作,揭示了二叠纪构造-沉积分异... 四川盆地西部二叠纪时期位于稳定克拉通边缘,受到海西运动、东吴运动和峨眉地裂运动的共同作用,发生构造-沉积分异。本文采用构造控盆、盆地控相、相控成藏要素组合的研究思路,在川西地区开展新一轮研究工作,揭示了二叠纪构造-沉积分异对油气成藏的控制作用,明确川西地区海相碳酸盐岩油气勘探潜力。盆地二叠纪以拉张伸展背景为主,总体呈现“南部隆升、西部裂陷、北部拉张”的沉积格局。二叠纪多期构造运动共同导致了川西地区一系列台内裂陷的形成,叠加二叠纪时期海平面变化,控制了栖霞至长兴期的多期台缘发育。川西北地区发育北东—南西向和北西—南东向两组断裂体系控制该区岩相古地理格局,其中龙门山断裂带主要控制了泥盆纪至二叠纪栖霞期沿上扬子台地西北缘发育台缘带,呈北东向展布。茅口至长兴期台缘带受克拉通边缘及台内裂陷共同控制,在川西地区呈北东向展布,梓潼—老关庙地区沿裂陷发育呈北西向展布,在剑阁一带,栖霞、茅口、吴家坪和长兴组多期台缘带叠置发育。川西地区二叠纪多期台缘控制了多层系优质滩相储层和礁储层叠置发育,是川西地区二叠系规模孔隙型储层发育的主控因素。多期古裂陷、多期台缘带和成藏期大型古隆起三元素耦合有利于油气规模聚集成藏。川西多层系台缘带具有纵向叠置,平面呈北东向大面积展布的特征,具备万亿规模资源潜力,是四川盆地海相碳酸盐岩重要勘探接替领域。 展开更多
关键词 四川盆地西部 海西期 二叠系 台缘带 油气勘探潜力
下载PDF
中国“平原-山地”地形过渡带NDVI时空变异与气候响应 被引量:5
20
作者 马超 崔珍珍 +1 位作者 李婷婷 彭杨钊 《生态学报》 CAS CSCD 北大核心 2023年第5期2141-2157,共17页
研究地形过渡带植被的地形效应,边缘效应,及其对纬度、气候变化的响应,将为我国山地生态格局和资源禀赋的深层认知提供地学参考。利用1982—2015年第三代全球库存建模和制图研究归一化植被指数数据集(GIMMS NDVI3g v1)和年均气温、降水... 研究地形过渡带植被的地形效应,边缘效应,及其对纬度、气候变化的响应,将为我国山地生态格局和资源禀赋的深层认知提供地学参考。利用1982—2015年第三代全球库存建模和制图研究归一化植被指数数据集(GIMMS NDVI3g v1)和年均气温、降水等气象数据,分别进行最大值合成、趋势分析、突变分析、变异分析和相关分析,揭示了中国近南北走向的“平原-山地”地形过渡带(简称“地形过渡带”)植被物候的时空变化规律及对气候变化的响应特征。研究表明:(1)“地形过渡带”跨越一年三熟的低纬度地区,到一年两熟的中纬度地区,再到一年一熟的高纬度地区的周期性植被物候特征区;(2)34年间,年际NDVI整体呈增长趋势,其中植被改善区域占58.84%;年内分析表明“地形过渡带”植被生长期(LOS)变化率-3.16 d/纬度;(3)34年间“地形过渡带”的年均气温呈现升高趋势,每10年上升速率为0.098—0.386℃之间;年均降水呈现减少趋势,每10年下降速率为8.29—31.82 mm;(4)34年间NDVI变异系数结果表明,研究区NDVI低波动变化和相对较低波动变化的面积占比达95.52%,说明研究区植被呈稳中向好趋势;(5)NDVI与年均气温的相关性随着纬度的升高而减弱,表明南方植被对气温变化敏感;NDVI与年均降水量的相关性随着纬度的升高而升高,表明北方植被对降水变化敏感。 展开更多
关键词 地形过渡带 第三代全球库存建模和制图研究归一化植被指数(GIMMS NDVI3g v1) 地形效应 边缘效应 趋势分析 相关性分析 变异分析
下载PDF
上一页 1 2 11 下一页 到第
使用帮助 返回顶部