塔北隆起轮东斜坡带断层特征与油气关系

Characteristics of Faults and the Relation with Hydrocarbon in the LunDong Slope Zone of the North Tarim Uplift

古生界走滑断层及中新生界继承性正断层是轮东斜坡带最主要断裂构造类型。在新三维地震资料解释基础上,研究分析该区断层特征、成因及演化,探讨其石油地质意义。结果表明,该区古生界走滑断层切面上具形迹丰富、共轭、雁列构造特征,中新生界正断层密集发育。剖面上走滑断层具断面陡直,中新生界正断层呈花状构造特点,并具典型"海豚效应"和"丝带效应"。受区域剪切作用形成的挤压应力场影响,区内走滑断层形成于海西中晚期,并在中新生界长期继承性活动,形成花状构造。该断层对区内石油运聚及再分布具重要影响,它控制了轮东斜坡带寒武—奥陶系地层构造样式,改善了寒武—奥陶系碳酸盐岩地层储层储集性能,提高了岩溶发育程度,从而影响着区内油气成藏和油气分布特征。

Strike-slip faults are the most important faulted structural elements in LunDong slope zone.The characteris-tics, genesis and petroleum geological significance of strike-slip fault in the study area were studied base on the latest 3D seismic data.The result shows that strike-slip faults have the characteristics of abundant appearance,conjugate and en ech-elon structure in the horizontal sections, and there developed strike-slip faults with very steep section, flower structure, dolphin effect phenomena and ribbon effect phenomena in the vertical sections.The strike-slip faults were generated in the middle and late Hercynian, and its long-term successive active was influenced by the regional stress field,which was caused by the shear action.Additionally,the strike-skip faults have a very significant impact on hydrocarbon migration,ac-cumulation, preservation and redistribution by determining the tectonic styles of Cambrian-Ordovician stratigraphy,en-hancing the reservoir physical property of Cambrian-Ordovician stratigraphy, increasing the karstification of reservoirs, and the influencing the formation and distribution of oil and gas reservoirs.