柴达木盆地东部不整合结构的地球物理响应及油气地质意义

柴达木盆地东部经历了多期次构造运动,形成了多个不整合。这些不整合在剖面上可分为5种类型,它们在地震上具有明显的反射特征。在纵向上,不整合划分为3层结构,每层结构发育着多种岩石类型,在测井曲线组合上具有各自不同的响应。不整合纵向的分层结构构成油气运移的双重通道,同时为油气聚集提供了良好的储集空间和圈闭条件。尽管不整合的成藏条件有共同之处,但由于形成各类不整合时的应力强度、应力作用方式及地层变形程度均存在差异,导致不同类型的不整合具有各自不同的油气成藏模式。

Geophysical response of unconformities and petroleum geological significance in the eastern Qaidam Basin

Several unconformities were resulted from the multiple tectonic movements in the eastern Qaidam Basin.Those unconformities can be divided into five types of unconformity with different reflection characteristics in seismic sections.In the vertical,the unconformity structures can be divided into three layers.Every layer consists of several kinds of rocks with different logging responses in electro-facies.These unconformities are good pathways for oil and gas migration and can provide good accommodation for oil and gas accumulation.Although reservoir-forming conditions of the unconformity are similar,the different type of unconformity shows different oil and gas reservoir-forming pattern due to the different stress behavior and deformation level.