马海-大红沟凸起油气成藏主控因素研究

马海-大红沟凸起位于柴北缘中段,被多个生烃凹陷所包围,其侏罗系烃源岩的成熟演化和排聚作用控制了区内油气的分布。断裂促使形成了研究区"两凹夹一隆"的基本构造形态,同时断裂控制圈闭发育及油气运移。研究区3套不同储、盖组合对油气保存起到很大作用,构造运动对油气进行调整和改造。初步认为马海-大红沟地区成藏主要受4种因素的控制:烃源岩,包括烃源岩的生烃能力和位置;断裂展布及输导体系;圈闭的形成时间和有效性;油气藏的保存条件。

Main controlling factors of hydrocarbon accumulation in Mahai-Dahonggou uplift

Located in the middle of North Qaidam basin,MahaiDahonggou uplift is surrounded by multiple hydrocarbongeneration sags,the hydrocarbon distribution is controlled by maturity evolution,discharge,and accumulation of Jurassic hydrocarbon source rock.The basic structure form,'two-sag-one-uplift'in the research area is formed by faulting,and the trap development and hydrocarbon migration are controlled by faulting as well.In the research area,three different sets of reservoir-caprock association play a big role in hydrocarbon preservation,and the tectonic movement has an effect on hydrocarbon adjustment and reform.The hydrocarbon accumulation of Mahai-Dahonggou region has been preliminarily believed to be mainly controlled by four factors,hydrocarbon source rocks(the generation ability and position included),the fracture distribution and transportation systems,the trap formation time and validity,and the reservoir preservation condition.