![]() ![]() In the early stage of oil and gas exploration in the Sichuan Basin, major breakthroughs were made with Permian and Triassic as the main exploration targets. Since the Proterozoic, the study area has experienced multiple periods of tectonic movement, and these periods can be divided into several structural layers bounded by detachment layers and various developed structural styles. ![]() The eastern Sichuan Basin is characterized by a series of nearly parallel, highly steep anticlinal fold belts, with multiple sets of regional detachment layers and multiple deep and large basement faults in the region ( Wang et al., 2015 Pan et al., 2020). Strike-slip faults formed in the early stage can be activated and subsequently developed upwards in the later stage, and the development characteristics of structural styles formed in the early stage will also affect the late structural deformation. ![]() On strike-slip fault zones in complex structural areas, due to the tectonic movement of different mechanical properties, the formation lithology is different, the faults usually show the characteristics of regional detachment strata-bound. A variety of different construction styles can occur simultaneously on one strike-slip fault zone, and these structural styles can be interpreted as the segmented nature of a strike-slip fault ( Peacock, 1991 Dooley and Schreurs, 2012 Jiao, 2017 Qi, 2020 Zeng et al., 2022), however, the factors controlling segmentation are rarely discussed, especially for strike-slip faults developed in complex structural areas. In the recent years, more and more attention has been paid to the geometry and kinematics characteristics of strike-slip fault zone and a series of oil and gas exploration achievements related to strike-slip faults ( Fisher and Knipe, 2001 Laubach et al., 2019 Torabi et al., 2019). The characteristics and structural styles of strike-slip faults have been characterized carefully in many literatures ( Tchalenko, 1970 Sylvester, 1988 Mcclay and Bonora, 2001 Mitra and Paul, 2011 Dooley and Schreurs, 2012 Moscariello et al., 2017). This study of the structural style and genetic mechanism of a strike-slip fault zone is of guiding significance to the exploration and development of strike-slip fault-controlled reservoirs in the study area. The strike-slip fault experienced at least three active stages of superimposed deformation during its formation and reconstruction, among which episode II in the middle Caledonian movement was the main active stage of the No. the left strike-slip distance of the TS interface is 0.462 km, and the right strike-slip distance of the TP2 interface is 0.782 km. 15 strike-slip fault mainly shows a subvertical fracture, positive flower structure and negative flower structure and a composite flower structure with positive and negative flower structures superimposed on each other in the upper and lower planar sections with linearly outspread and zonal distribution characteristics spatially, there is a “ribbon” effect and a “dolphin” effect. The research results show that the profile of the No. 15 strike-slip fault was a large basement strike-slip fault. The dynamic characteristics are analysed based on the structural style of the superimposed development model and the nature and activity intensity of strike-slip faults in different periods. Based on highly precise 3D seismic section, coherent attribute slice and time slice, the geometric and kinematic characteristics of the fault are analyzed. ![]() This paper fills in the blank of geometry and kinematics research on the strike-slip fault zone in this area. There are almost no previous studies on strike-slip faults in the eastern Sichuan Basin. It is found that there are a series of NW-SE base-trending strike-slip faults in this area besides NE-SW strike-blocking structures. The eastern Sichuan Basin has undergone multiple stages of tectonic evolution and shows complex structural characteristics.
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