Study On The Influence Of Thrust-Slip Structure On Tectonic Joints In Jiaoshiba Area Of Fuling

Based on the seismic interpretation profiles of the study area,this paper combines the fracture geometry,tectonic dynamics,and kinematics studies to restore the regional tectonic evolution process of the Cobblestone Dam and its eastern Sichuan region using a balanced geological profile,and analyzes the study area.With the basal surface and the inner curtain slipping thrusting ? the base is involved in the thrust ? the multi-layer partial slip of the sedimentary layer ? the partial re-thrusting structural deformation characteristics,the establishment of structure space structure,level,fault structure grade,structural combination and distribution law The characteristics of different tectonic evolution stages were determined.By studying the division of tectonic units and the law of structural deformation,combined with the core and fracture predictions of drilling,the impact of thrust-sliding structures on the distribution of fracture types was analyzed,and the types of tectonic joints were studied.The influence of distribution law on shale gas preservation conditions.Combining with the results of the interpretation of the regional large-scale seismic sections,a tectonic framework for the co-existence of Yang-inverse-concealing shingling and capping-sliding structures was established for the study area to the Huayushan fault zone as basement-incremental progressive extrusion propulsion.In the study area,Jurassic-style baffle folds and their causes of transformation were identified,and four sets of detachment layers were identified and distributed regularly.It was considered that the slip layer of the Silurian Longmaxi-Wufeng Formation under the target layer was the main detachment layer.One;divided the two major structural combinations(substrate involved in thrust and capping slip nappe)and ten structural styles.The basic tectonic deformation of the study area is basically determined as early and mid-Yanshan,and it is summarized as five evolutionary stages.The Yangtze Platform,the back-slant fold generation and the formation period,the Jurassic baffle and the partition-type fold formation,the basement inclusion and cover The formation and formation period of layer slippage and tectonic evolution?middle to late Yanshan-now eradication and reconstruction period;the establishment of tectonic systems and types and distribution patterns of tectonic joints,combined with core coring,seismic curvature,and ant body properties,it is believed that the main body of Jiaoshiba anticline The target layer mainly develops bedding shear cracks,oblique cracks and twist cracks in the wings are favorable for shale gas accumulation,and shear cracks along the wing-hedging and fault folds—shallow shear joints—between layers The combination of collapses has increased the potential for vertical loss of shale gas.The early slippage of the basement and the collapse of sedimentary seals formed folds,forming the Jurassic-style folds.During the middle period of the Yanshan Mountains,it was transformed by the base shingle thrust and the cap rock slipping deformation,and the upper strata of the Caoshiba dam was formed and fractured.It is rarely developed and provides favorable conditions for the accumulation of shale gas.