RELATIONSHIP OF RESERVOIR FORMATION WITH UNCONFORMITIES AND THEIR GEOPHYSICAL RESPONDENCE IN THE JUNGGAR BASIN
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摘要: 准噶尔盆地自成盆期以来经历了多期次构造运动,形成数个不整合。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,不整合分为3层结构,每层结构发育着多种岩石类型,它们在测井曲线组合上具各自不同的响应。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等存在差异,导致不同类型的不整合还具有各自不同的油气成藏模式。Abstract: Several unconformities were formed as a result of several tectonic movements in the Junggar Basin. Five types of unconformity were recognized, with different reflection characters in seismic sections for each one. Unconformity structures are vertically divided into three layers, and every layer is consisted of several kinds of rocks with different logging responses in electrofacies. These unconformities not only are the pathways for oil and gas migration, but also provide accommodation for oil and gas accumulation. Although reservoir-forming conditions of the unconformity have the similar parts, the different types of unconformity show different oil and gas reservoir-forming patterns due to different stress behaviours and deformation levels when the unconformities were formed.
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