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笔者根据四川区内若干三叠系油气藏赋存地质特征,提出控制油气藏的因素,不仅是“重力分异”、 “水动力驱动”等,地应力控制圈闭,应该是主要的因素。笔者应用固体力学理论,把含油气藏的背向斜构造,看作是各向同性,均匀连续的弹塑体受力失稳产生的挠曲,分析其应力分布状况,结合实例,建立地应力圈闭的简单成藏模式,得出油气运移、聚集、形成油气藏都受地应力场的控制,或与受地应力控制的构造形变过程同时进行及完成的。
According to the geological characteristics of some Triassic reservoirs in Sichuan, the author puts forward the factors that control the oil and gas reservoirs. It is not only “gravity differentiation” and “hydrodynamic drive”, but also should be the main factor of geostress control traps. The author applies the theory of solid mechanics to consider the back-oblique structure of oil-bearing reservoirs as the deflection caused by the force failure of isotropic and uniform continuous elastic-plastic body, analyzes its stress distribution, and establishes the stress It is concluded that the hydrocarbon migration, accumulation and formation of oil and gas reservoirs are all controlled by the geostress field, or at the same time as the tectonic deformation controlled by geostress.