Abstract：Multiple detached layers in the East Sichuan Basin were formed in multi-period structural movements with multiple tectonic styles.It is very important to understand tectonic characteristics and its relationship with hydrocarbon accumulation.With a joint use of seismic,drilling,and geological data,we analyze main detached layer distributions,detached structure features,structure styles,formation mechanism,and their relationship with hydrocarbon accumulation.The following understandings are obtained:①The main detached layers in the East Sichuan Basin are Cambrian and Triassic gypsum-salt rocks.The structural deformation is influenced by two sets of gypsum-salt layers,forming a typical multi-detached structures; ②Based on the boundary between the upper of Triassic gypsum salt rocks and the bottom of cambrian gypsum salt rocks,the fold belt in the East Sichuan Basin can be divided into 3 structure-deformed layers,upper,middle,and lower; ③The upper-structure layer is a typical northeast Jura-type fold.The middle-structure layer is complex and more faults,and characterized by different structure styles such pop-up structure,decolled fold,fault fold,and duplex.The lower-structure layer is a large wide and slow anticline,rather than the long axis anticline as previous research understanding; ④The main controlling factors of multi-detached structure developing and evolving in the East Sichuan Basin are structure compression,differential loading,and gravity gliding; ⑤Gypsum-salt detached layers,slip faults and related structures are closely related to hydrocarbon reservoir forming,and Cambrian pre-salt structures are considered as important hydrocarbon reservoirs.These understandings will provide some guidance for the hydrocarbon exploration in East Sichuan Basin.
王志勇, 康南昌, 李明杰, 臧殿光, 张怡, 杨昕. 四川盆地川东地区滑脱构造特征[J]. 石油地球物理勘探, 2018, 53(s1): 276-286.
WANG Zhiyong, KANG Nanchang, LI Mingjie, ZANG Dianguang, ZHANG Yi, YANG Xin. Detached structure features in the East Sichuan Basin. Oil Geophysical Prospecting, 2018, 53(s1): 276-286.
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