准噶尔盆地北东向构造及其油气地质意义
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摘要
准噶尔盆地深、浅层构造存在差异 ,通过地震、地质资料分析了准噶尔盆地发育在中、晚二叠世、三叠纪的北东向构造特征 ,认为中、晚二叠世、三叠纪地层沉积受北东和北西向正断裂控制 ,由北东向正断裂控制的沉积中心构成了雁列组合特征 .地质力学和大地构造背景分析认为 ,盆地形成期的北东向构造与边缘断裂的左旋走滑作用有关 .北东向的逆冲断裂形成于或主要活动于三叠纪末的盆地挤压反转作用 .成盆拉张和反转挤压作用都使得北东向构造成为有利的油气聚集带 ,上叠盆地的披盖沉积对北东向油气聚集带的保存起到重要作用
The structures in deep and shallow strata are different in Junggar basin. The NE-trending structures developed in Middle-Late Permian and Triassic in Junggar basin have been analyzed by means of seismic and geologic data. The results indicate that the sedimentation of Middle-Upper Permian and Triassic is controlled by NE- and NW-trending normal faults. Depo-centers controlled by NE-trending faults show an echelon pattern. The NE-trending structures formed in the basin formation result from the sinistral strike-slip movement of marginal faults. NE-trending reverse faults mainly formed on the end of Triassic because of the basin inversion. The belts of NE-trending structures during extension and inversion stages are (available) for hydrocarbon accumulation. The draping sediments of post-Triassic period superposed on the middle-late Permian and Triassic basin are very important for the preservation of oil and gas.
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