东濮凹陷户部寨气田天然气成藏地球化学特征

主要通过天然气组分、碳同位素、氩同位素、轻烃等地球化学数据，分析了东濮凹陷户部寨气田天然气来源、运聚相态，并结合烃源岩的埋藏演化史和断层活动期，综合判断了天然气充注成藏的时间，分析了成藏过程。研究表明，户部寨气田沙三下亚段—沙四段天然气主要为沙一期石炭—二叠系生成的煤成气，运移以游离相为主，混有很少量东营中期濮卫洼陷沙三下—沙四上亚段生成的油型气。

Geochemical Characteristics of Gas Accumulation in Hubuzhai Gas Field,Dongpu Depression

The origin and phase state of natural gas migration in Hubuzhai gas field, Dongpu Sag are discussed based on the study on hydrocarbon composition, carbon and argon isotope of natural gas and light hydrocarbon. Combined with analysis of the history of hydrocarbon generation of source rock and fault activity, the accumulation time and history of gas are comprehensively determined. It is indicated that the gas in the lower Es₃ and Es₄ in Hubuzhai gas field was mainly coalformed from C-P in the Es₁ depositional stage and it migrated mostly in free phase. There is a litle oil-type gas in low Es₃ to up Es₄ in Puwei sub-sag in the Ed depositional stage.