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以四川盆地乐山—龙女寺古隆起震旦系古老碳酸盐岩气藏为研究对象,通过系统分析气藏储集层、天然气组分及气藏类型、油气成藏条件与成藏演化等,研究了震旦系古老碳酸盐岩气藏成藏过程。乐山—龙女寺古隆起震旦系灯影组已发现6个气藏,气藏储集岩类、储集层类型基本一致,均具有高温、常压、强非均质性特征,但不同层段气藏类型、古隆起不同部位气藏天然气组成及碳同位素组成等方面具有明显差异。古隆起震旦系灯影组天然气属于油裂解气,主要为灯影组自身烃源岩与寒武系筇竹寺组烃源岩的混源气,良好的烃源岩、储集层、源储组合与输导条件决定了灯影组气藏的形成和保存。古隆起区灯影组气藏的形成经历了古油藏生成、古油藏裂解、气藏的调整与定型3个阶段,受古隆起形成及不同部位构造差异演化影响,气藏形成具有3种不同的天然气聚集成藏过程。
Taking the Sinian ancient carbonate reservoir in Leshan-Longnv Temple of Sichuan Province as the research object, this paper systematically analyzes the characteristics of gas reservoirs, natural gas components and gas reservoir types, hydrocarbon accumulation conditions and hydrocarbon accumulation and evolution , Studied the accumulation process of the Sinian ancient carbonate gas reservoirs. Leshan-Longnupu paleo-uplift Sinian Dengying Formation has been found in six gas reservoirs, gas reservoir rock, reservoir types are basically the same, are characterized by high temperature, atmospheric pressure and strong heterogeneity, but different layers There are obvious differences between the types of gas pools and the gas composition and carbon isotopic composition of gas reservoirs in different parts of paleohigh. The gas from the Sinian Dengying Formation in the paleohigh belongs to the oil cracking gas, which is mainly derived from the mixed gas of the source rock of Dengying Formation and the source rocks of the Cambrian Qiongzhusi Formation, with good source rock, reservoir and source-reservoir combination And the conduction conditions determine the formation and preservation of the Dengying Formation gas reservoir. The formation of the Dengying Formation gas reservoir in the Guligou area underwent the three stages of paleo-oil reservoir formation, paleo-oil reservoir cracking and gas reservoir adjustment and formation. Due to the evolution of paleo-uplift and the structural evolution of different parts, gas reservoirs formed three different types Of the natural gas accumulation process.