塔里木盆地托甫台地区TP12CX走滑断裂构造特征及控储作用OA

Strike-slip fault zones are well developed in Tuofutai area of Tarim Basin,and exploration has confirmed that hydrocarbon accumulation is significantly controlled by strike-slip faults.To clarify the reservoir heterogeneity caused by differential activities of strike-slip faults,based on high-precision 3D seismic data from Tuofutai area,detailed analysis is conducted on structural deformation characteristics,activity intensity calculation and activity period determination of TP12CX strike-slip fault zone.Drilling and logging data are integrated to explore the control-ling effect of differential strike-slip fault activities on reservoirs.The results show that TP12CX strike-slip fault can be spatially divided into 3 sets of deep,medium,and shallow fault systems.The deep system is dominated by verti-cal and main strike-slip faults,while the middle system exhibits typical floral structures in seismic profiles,which can be mechanically divided into transtensional,transpressional,single-fault transtension,single-fault transpres-sion and pure strike-slip segments,with transtensional segments being the most abundant.The shallow system con-sists of a set of en echelon normal faults formed in 3 phases under the influence of deep strike-slip faults.The north-ern part of TP12CX strike-slip fault zone shows large variations in average vertical displacement,with frequent al-ternation between positive and negative values,high length ratios of fault segments and significant vertical displace-ment change rates,indicating strong strike-slip fault activity.In contrast,the southern part shows relatively stable and weaker activity.Highly active areas are characterized by well-developed and high-quality reservoirs,with large-scale and vertically continuous reservoirs,which are more prone to develop fracture systems and fracture cavities controlled by fault activities.The research provides theoretical support for exploration and development of strike-slip fault-controlled reservoirs in Tuofutai area.