论文部分内容阅读
我国东部油区天然气主要有第三系深凹陷油型热裂解成气、第三系中浅层生物改造热作用成气、古—中生界煤系高演化成气三种主要类型。东部陆相富油盆地内天然气富集带的形成条件主要有 :烃源层系内高异常地温场或早期生物改造条件的存在 ;高热演化烃源岩在中等热演化期没有较显著的排烃史或一次热演化程度不高 ;聚气构造带为区域拉张背景下的扭压应力环境所形成 ;各种流体势系统中的相对低势环境以及具有良好的储、盖及保存条件等
The natural gas in the eastern oil region in China is mainly composed of oil-derived pyrolysis gas in the Tertiary deep depression, thermal active gas in shallow-middle-bio-remodeling in the Tertiary and high evolution of Paleo-Cenozoic coal measures. The formation conditions of natural gas-rich zones in the oil-rich terrestrial oil-rich basins are mainly the existence of high anomalous geothermal field or early biotransformation conditions in the hydrocarbon source beds; there is no significant hydrocarbon expulsion history in the high-thermal evolution source rocks The thermal evolution is not high; the gas-accumulation tectonic belt is formed by the torsional compression stress environment in the region stretching background; the relative low-potential environment in various fluid potential systems and has good storage, cover and preservation conditions