塔北隆起轮东斜坡带走滑断层特征及其石油地质意义

STRIKE-SLIP FAULTS＇ CHARACTERISTICS AND THEIR PETROLEUM GEOLOGICAL SIGNIFICANCES IN LUNDONG SLOPE BELT OF NORTH TARIM UPLIFT

走滑断层是轮东斜坡带最主要的断裂构造类型。在新三维地震资料解释的基础上，研究分析该区走滑断层特征、成因及演化，进而探讨其石油地质意义。结果表明：该区断层切面上走滑断层具有形迹丰富、共轭、雁列构造的特征；剖面上走滑断层具有断面陡直、花状构造特点，并具有典型的“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，并长期继承性活动；该走滑断层对区内石油运聚保及其再分布具有极其重要的影响，控制了轮东斜坡带寒武-奥陶系的构造样式，改善寒武-奥陶系碳酸盐岩地层的储层储集性能，提高岩溶发育程度，进而影响区内油气成藏和油气分布特征。

Strike-slip faults are the most important faulted structural types in Lundong Slope Belt. Based on the in- terpretation of the latest 3D seismic data, the characteristics, genesis and evolution of the faults in the study area are analyzed and studied, and furthermore their petroleum geological significances are explored. The results show that the strike-slip faults on the fault broken-out sections are characterized by abundant appearance, conjugation and en echelon structure; and moreover by very steep sections and flower structure in the vertical sections, at the same time, by the typical ＂dolphin effect＂ and ＂ribbon effect＂. Influenced by the compressive stress field resulted from the regional shear action, the strike-slip faults in the region were generated in the middle and late Hercynian movement, and moreover acted successively for quite a long time; the strike-slip faults possess an extremely signifi-cant impacts on the hydrocarbon migration, accumulation, preservation and re-distribution in the region in the forms of determining the tectonic styles of Cambrian-Ordovician strata in Lundong Slope Belt, improving the reser- voir preserving properties of Cambrian-Ordovician carbonate strata, increasing the karst development. In a word, the specialities of the faults influence the petroleum reservoir-formation and their distribution characteristics in the region.