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  4. 中国科学院油气资源研究重点实验室
Vertically transferred overpressures along faults in Mesozoic reservoirs in the central Junggar Basin, northwestern China: Implications for hydrocarbon accumulation and preservation

文献类型：期刊论文

作者Zhang, Likuan1,2; Li, Chao1,2; Luo, Xiaorong1,2,6; Zhang, Zengbao5; Zeng, Zhiping4; Ren, Xincheng4; Lei, Yuhong1,2; Zhang, Meng5; Xie, Junyang3; Cheng, Ming1,2
刊名MARINE AND PETROLEUM GEOLOGY
出版日期2023-04-01
卷号150页码:18
ISSN号0264-8172
关键词Overpressure mechanisms Disequilibrium compaction Vertical transfer Oil accumulation Caprock integrity Central Junggar basin
DOI10.1016/j.marpetgeo.2023.106152
英文摘要Abnormally high pressure (overpressure) is common in oil reservoirs of the Mesozoic formations in the central Junggar Basin. However, the generation mechanisms of overpressure are still uncertain, which not only affects safe drilling implementation, but also restricts the understanding of hydrocarbon migration and accumulation. Based on measured pressures and mud weights, the pore pressure distributions in the Mesozoic formations are characterized in detail. The different generation mechanisms of overpressure in mudstones and sandstones are investigated based on logging responses and basin modeling. Finally, the significance of reservoir overpressure to oil accumulation and leakage is discussed. The results indicate that overpressure in the Mesozoic reservoirs in the central Junggar Basin is mainly developed below 4500 m, the excess pressures are between 12 and 58 MPa, the pressure gradient ranges from 12 to 21 MPa/km, the pressure ratios range from 0.6 to 0.95, and the overpressure ratios are between 0.25 and 0.91. The high-overpressure in reservoirs is mostly present in isolated sand bodies that are hydraulically connected to Permian source rocks by faults. The overpressure data corresponding to a pressure gradient of 11-14 MPa/km plot on the loading curve, showing typical disequilibrium compaction overpressure. The points with pressure gradients greater than 14 MPa/km obviously deviate from the loading curve, indicating unloading overpressure mechanisms. The logging responses and numerical simulation results confirm that the overpressure in mudstone is mainly generated by disequilibrium compaction and chemical compaction, and hydrocarbon generation has a limited contribution. The unloading overpressure in the sand-stone is mainly generated by the vertical overpressure transfer process from the deep Permian overpressured compartment. The vertical transfer of overpressure is often related to oil migration and accompanied by high oil saturations. However, high-overpressure presents challenges for the sealing capacity of caprocks. Hydro -fracturing or the activation of preexisting faults due to high overpressure determines the risk of seal failure, which controls hydrocarbon leakage. The research is of great significance for understanding the mechanisms of hydrocarbon migration along faults and evaluating caprock integrity in similar basins.
WOS关键词KRISHNA-GODAVARI BASIN ; PORE-PRESSURE ; PETROLEUM ACCUMULATION ; YINGGEHAI BASIN ; SOUTHERN MARGIN ; CARNARVON BASIN ; FLUID PRESSURE ; ORGANIC-MATTER ; STRESS ; MECHANISMS
资助项目National Natural Science Foundation of China[42030808] ; National Natural Science Foundation of China[42102176] ; National Natural Science Foundation of China[41372151] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA14010202] ; Shengli Oil Company (SINOPEC)
WOS研究方向Geology
语种英语
出版者ELSEVIER SCI LTD
WOS记录号WOS:000997279600001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Shengli Oil Company (SINOPEC) ; Shengli Oil Company (SINOPEC) ; Shengli Oil Company (SINOPEC) ; Shengli Oil Company (SINOPEC) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Shengli Oil Company (SINOPEC) ; Shengli Oil Company (SINOPEC) ; Shengli Oil Company (SINOPEC) ; Shengli Oil Company (SINOPEC) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Shengli Oil Company (SINOPEC) ; Shengli Oil Company (SINOPEC) ; Shengli Oil Company (SINOPEC) ; Shengli Oil Company (SINOPEC) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Shengli Oil Company (SINOPEC) ; Shengli Oil Company (SINOPEC) ; Shengli Oil Company (SINOPEC) ; Shengli Oil Company (SINOPEC)
源URL[http://ir.iggcas.ac.cn/handle/132A11/110938]  
专题地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者Li, Chao
作者单位1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
3.PetroChina, Xinjiang Oilfield Co, Res Inst Explorat & Dev, Urumqi 830013, Peoples R China
4.Shengli Oilfield Co SINOPEC, Res Inst Explorat & Dev, Dongying 257000, Peoples R China
5.Xinjiang Xinchun Petr Dev Co Ltd SINOPEC, Dongying 257000, Peoples R China
6.Northwest Univ, Dept Geol, Xian 710069, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Likuan,Li, Chao,Luo, Xiaorong,et al. Vertically transferred overpressures along faults in Mesozoic reservoirs in the central Junggar Basin, northwestern China: Implications for hydrocarbon accumulation and preservation[J]. MARINE AND PETROLEUM GEOLOGY,2023,150:18.
APA Zhang, Likuan.,Li, Chao.,Luo, Xiaorong.,Zhang, Zengbao.,Zeng, Zhiping.,...&Xu, Bingbing.(2023).Vertically transferred overpressures along faults in Mesozoic reservoirs in the central Junggar Basin, northwestern China: Implications for hydrocarbon accumulation and preservation.MARINE AND PETROLEUM GEOLOGY,150,18.
MLA Zhang, Likuan,et al."Vertically transferred overpressures along faults in Mesozoic reservoirs in the central Junggar Basin, northwestern China: Implications for hydrocarbon accumulation and preservation".MARINE AND PETROLEUM GEOLOGY 150(2023):18.

入库方式： OAI收割

来源：地质与地球物理研究所

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