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近期,在莺歌海盆地泥底辟构造带获得了工业性天然气流及少量凝析油。如何认识其成因及烃源关系,直接关系到本区进一步勘探的方向。本文在已获地质地化资料基础上,对油气成因类型及其烃源关系进行了剖析与探讨,指出了该区天然气及凝析油属低熟-成熟煤型为主的偏腐殖混合型油气,其油气轻烃组成、甲烷及其同系物碳同位素分布以及伴生油的生物标志物组成均具有煤型为主的混合型油气的特点,烃源则主要来自莺黄组中下部2400m以下的偏腐殖混合型生烃岩。
Recently, industrial natural gas streams and a few condensates have been obtained in the mud-diapir structural belt in the Yinggehai Basin. How to understand its causes and the relationship between hydrocarbon sources has a direct bearing on the direction of further exploration in this area. Based on the data of geology and geochemistry, this paper analyzes and discusses the genetic types of hydrocarbons and their hydrocarbon sources. It is pointed out that the natural gas and condensate in this area belong to the partial humic hybrid Hydrocarbons, hydrocarbon-light hydrocarbon composition, carbon isotope distribution of methane and its homologues, and biomarkers of associated oil all have the characteristics of coal-based mixed hydrocarbon. The hydrocarbon sources mainly come from the partial rot Mixed mixed hydrocarbon rock.