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采用多项有机质丰度、类型和成熟度指标描述了天2井暗色泥岩的生烃潜力特征。研究成果揭示,下白垩统巴音戈壁组下段烃源岩有机质丰度最高、热演化处于成熟阶段,有机质类型为Ⅱ2～Ⅲ型,应该是天草凹陷的主力烃源岩;下白垩统苏红图组有机质丰度较高,有机质类型为Ⅱ2型,但其烃源岩成熟度不高,为天草凹陷的次要烃源岩;石炭系和侏罗系烃源岩虽有机碳高,但生烃潜量值低,有机质类型为Ⅲ型,现今Ro>3.0%,处于过成熟阶段,属枯竭的烃源岩。在对研究区可能烃源岩生物标志物组合特征广泛调查的基础上,采用气相色谱、定量气相色谱-质谱技术,从生物标志物指纹和绝对浓度特征确认了天2井原油与下白垩统巴音戈壁组下段烃源岩有成因联系,指出巴音戈壁组下段烃源岩为天草凹陷主力烃源岩。
A number of organic abundance, type and maturity indicators are used to characterize the hydrocarbon potential of dark mudstone in Well Tian 2. The research results reveal that the Lower Cretaceous Bayingebi Formation hydrocarbon source rocks have the highest organic matter abundance, the thermal evolution is in the mature stage, and the organic matter types are Type II2 ~ Ⅲ, which should be the main source rocks in Tiancao Sag. The Lower Cretaceous Suhongtu The organic matter abundance is higher and the type of organic matter is typeⅡ2, but the maturity of the source rock is not high, which is the secondary source rock of Tiancao Sag. Although the organic carbon is high in the Carboniferous and Jurassic source rocks, the hydrocarbon generation Low potential value, organic matter type Ⅲ, Ro> 3.0% now, in the mature stage, is a depleted source rock. Based on the extensive investigation of the biomarker assemblages of possible source rocks in the study area, gas chromatography and quantitative gas chromatography-mass spectrometry (GC-MS) techniques were used to confirm the relationship between the Tian 2 well crude oil and the Lower Cretaceous The source rocks of the Lower Gobi Formation have genetic association, indicating that the lower source rocks of Bayingeobi Formation are the main source rocks of Tiancao Sag.