塔里木盆地雅克拉断凸构造样式与油气成藏

塔里木盆地雅克拉断凸经历了多期变形、改造与叠加,形成了多种构造样式,油气资源丰富。通过解释雅克拉断凸的新三维地震资料,并结合区域地质资料,综合分析了研究区构造变形特征及其与油气成藏的关系。研究区主要发育挤压、伸展、走滑、反转和潜山等构造样式。挤压构造样式可进一步分为背冲和褶皱一冲断构造,主要发育于前中生界,全区均有分布;伸展构造样式以正断层为主,发育于中、新生界,全区均有分布;走滑构造样式在剖面上表现为花状构造,平面上呈雁列式排列,发育于中、新生界,分布于亚南断裂中段;反转构造样式以上正下逆的负反转构造为主,仅东部地区可见;潜山构造样式可分为单斜、断块和基岩潜山,全区均有发育。雅克拉断凸不同类型的构造样式形成了背斜、断块、断层遮挡、潜山和潜山内幕背斜等多种类型圈闭,不整合面、输导层及断裂充当了油气运移通道,为油气远距离侧向和垂向运移提供了条件,由此研究区形成了背斜、断背斜、断层遮挡、潜山和潜山内幕等油气藏类型。

Structural styles and hydrocarbon accumulation in Yakela fault-convex,Tarim basin

The existence of various structural styles and abundant hydrocarbon have been discovered in the Yakela fault - convex, Tarim basin,which suffered reconstructing and superimposing in geological period.Through interpretation of 3D seismic data up to date,combining with the circumferential field geology,we analyzed synthetically the characteristics of structural deformation and its relationship with hydrocarbon migration and accumulation,it is divided into various structural styles in the Yakela faultconvex, including compressive structural style,extensional structural style,strike-slip structural style,inversion structural style and burial hill structural style etc.The compressive tectonic is composed of back to back thrust and reverse thrust,developing in pre-Mesozoic and distributing in whole area.The extensional tectonic comprises normal faults mostly,developing in Meso-Cenozoic and distributing in whole area.The strike-slip structure is consisted of flower structure mostly,developing in Meso-Cenozoic and distributing in the middle section of the Yanan fault.The reverse tectonic is composed mainly of negative reverse tectonic with the normal fault on the upper and the reverse fault on the lower,and the structural style has been found only in the eastern part of Yakela fault-convex.The burial hill tectonic develops in whole area,including monocline burial hill tectonic,fault block burial hill tectonic and basement burial hill tectonic etc.The different structural styles can develop many traps,such as monocline trap, fault block trap,fault screened trap,burial hill anticline trap and inner anticline trap of burial hill,which provide the favorable condition of trap for hydrocarbon migration and accumulation.In addition,the unconformities,the transportation beds and the fault act as the lateral and vertical migration pathway long distance for hydrocarbon.Consequently,there perhaps exists monocline reservoir,fault monocline reservoir,fault screened reservoir,burial hill reservoir and inner reservoir of burial hill etc.