柴达木盆地构造样式控油作用分析

ANALYSIS ON CONTROL OF TECTONIC STYLE TO PETROLEUM IN THE QAIDAM BASIN

戴俊生

DAI Jun-sheng

石油大学资源系, 山东东营 257062

Department of Resources, University of Petroleum, Dongying, Shandong 257062, China

在柴达木盆地构造样式基本特征研究的基础上,作者从构造样式发育阶段性与烃源岩分布地区性的关系、构造样式含油气性和构造样式对油气藏的改造作用等方面分析了构造样式的控油作用。文中指出燕山早期伸展构造样式发育阶段形成的烃源岩主要分布在盆地北部.第三纪压缩构造样式发育阶段形成的烃源岩主要分布在盆地西部,喜玛拉雅晚期强烈压缩构造样式发育阶段形成的烃源岩主要分布在盆地中部。生长背斜是主要的含油构造,反冲断层控制下的断展背斜是重要的含油气构造,生油范围内的纵弯背斜可形成油藏,纵弯背斜在三湖地区为含气构造。喜玛拉雅早、中期的压缩构造样式形成的油气藏常受到喜马拉雅晚期强烈压缩构造样式的改造,背斜核部的伸展构造对油气藏有改造作用。

Based on the basic characteristic study of tectonic style in the Qaidam Basin, the control of tectonic style to petroleum is analysed in this paper from the relation between the develpment of tectonic style by stages and the distribution of hydrocarbon source rocks by areas, the petroliferous properties of tectonic style, the reformation of tectonic style to oil and gas pools, etc. It is pointed out that the hydrocarbon source rocks formed in the development stage of extensional tectonic style in the early of the Yanshanian are mainly distributed in the north of the basin, those formed in the development stage of the Tertiary compressional tectonic style distributed in the west of the basin, and those formed in the development stage of strongly-compressional tectonic style in the late of the Himalayan distributed in the middle of the basin. The growth anticline is major oil-bearing tectonics. The fault propagation anticline controlled by recoil fault is important hydrocarbon-bearing tectonics. The longitudinal bend anticline in oil-generating areas can form oil pools. And the longitudinal bend anticline in Sanhu region is gas-bearing tectonics. The pools formed by the Early-Middle Himalayan compressional tectonic style regularly reformed by the strong compressional tectonic style of the Late Himalayan. The extensional structural style on the core of anticlines has reformation effects on oil and gas pools.

中国石油天然气集团公司“九五”科技工程项目(970208-02-02)

https://doi.org/10.11781/sysydz200002121