辽河滩海太葵构造带天然气成因及成藏条件

太-葵构造带深层天然气来源多,成因复杂,针对这一问题,用天然气组分、稳定碳同位素、轻烃组成、稀有气体同位素和伴生原油生物标志物等多种指标与邻区进行对比分析,认为该区天然气类型有油型气、煤型气二种成因,以煤型气为主,沙三段和沙一段烃源岩是本区煤型气的主要贡献者。成藏条件分析表明本区气源条件充足,储盖配置关系良好,油源断层较为发育,天然气保存条件有利,这些都为本区天然气聚集成藏提供了良好的条件。

The Research of Gas Origin and Reservoir Forming Condition on Taikui Tectonic Zone in the East of the Liaohe Beach Oilfield

The deep sources of natural gas is more and complicated causes in Taikui tectonic zone.We use the component of natural gas,the stable carbon isotope,light hydrocarbon composition,noble gas isotopes and associated crude biological markers and other indicators,and comparing with the adjacent areas to solve this problem.There are two kinds of causing natural gas type oil-gas and coal-type gas,mainly coal-type gas.The source rock of the first and Third Member of the Shahejie Formation are the major contributor of this coal-type gas.The analysis of reservoir conditions shows that the gas source is sufficient.The relationship of reservoir and cap rock is good.There are also many faults that contect to the source rock.Preserving conditions of natural gas is also very good.These factors provide good conditions to accumulate natural gas in this area.