文献类型：期刊文献

英文题名：Controls of Deep-Seated Faults and Folds on Hydrocarbon Fluid Migration and Accumulation in Sedimentary Basins: A Case Study from the Northwestern Sichuan Basin, China

作者：Wang, Xi Liu, Yin Cao, Jian Liu, Yiduo Luo, Bing Wu, Kongyou Shi, Zheng Kang, Hongbin

第一作者：Wang, Xi

通信作者：Wang, X[1]

机构：[1]Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210093, Peoples R China;[2]China Univ Petr East China, Shandong Prov Key Lab Deep Oil & Gas, Qingdao 266580, Peoples R China;[3]Univ Houston, Dept Earth & Atmospher Sci, Houston, TX 77204 USA;[4]PetroChina Southwest Oil & Gas Field Co, Explorat & Dev Res Inst, Chengdu 610212, Peoples R China;[5]Guizhou Inst Technol, Coll Resources & Environm Engn, Guiyang 550003, Guizhou, Peoples R China

第一机构：Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210093, Peoples R China

通信机构：corresponding author), Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210093, Peoples R China.

年份：2021

卷号：2021

外文期刊名：GEOFLUIDS

收录：;Scopus(收录号：2-s2.0-85122738734);WOS:【SCI-EXPANDED(收录号:WOS:000738927400001)】；

基金：We thank the Southwest Oil and Gas Field Company, PetroChina, for providing the geophysical data. We thank Dr. Zhigang Li of Sun Yat-Sen University for the fruitful suggestions on the upright open detachment folds. This research is jointly supported by the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 41821002), the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA14010301), the National Natural Science Foundation of China (Grant Nos. 41702138 and 41702198), and the Fundamental Research Funds for the Central Universities (18CX02012A and 17CX02001A). Dr. Yin Liu also thanks the China Scholarship Council (201906455017) for the support as a visiting scholar.

语种：英文

摘要：Deep-seated faults and folds of foreland basin systems have become important exploration targets in the recent years because they are crucial in controlling fluid migration and hydrocarbon accumulation. In this study, we analyzed the characteristics and formation history of these structures in the northwestern Sichuan Basin using recently acquired two-dimensional (2D) and three-dimensional (3D) seismic data. The seismic interpretation revealed that the thrust sheets, tectonic wedges, and foredeep were well developed in the northwestern Sichuan Basin from the mountain to the basin. Forward thrusts, fault-bend folds, and wedges are the main types of structures in the thrust sheets and tectonic wedges. The deep-seated faults and folds were easily recognized in the high-resolution 3D seismic data. The imbricate thrust faults that merged into detachment layers of the Lower Cambrian are the main types of structures in the foredeep, and they show a prominent strike-slip influence in the horizontal direction. The formation of these structures in the foredeep in the northwestern Sichuan Basin mainly endured two stages of thrusting, including those during the Middle-to-Late Triassic and Cenozoic. Based on the tectonic evolution and seismic data, we infer that these deep-seated faults and folds in the foredeep may have formed earlier than the northern Longmen Shan fold-and-thrust belts and they may have been initially active in the late of Early Triassic and reactive during the Cenozoic. Furthermore, evaporites in the Lower and Middle Triassic were crucial in forming these structures. The petroleum exploration data suggested that the deep-seated faults can facilitate hydrocarbon accumulation. The thrust faults in the foredeep were more likely to act as migration pathways for fluids instead of sealing barriers along the horizontal direction. The interconnected reservoirs of deep-seated folds possess a great potential to allow large-scale hydrocarbon accumulation. Our study provides a good example for evaluating the hydrocarbon exploration potential in the deeply buried area in the sedimentary basin.