Indication of Oil-Gas Migration & Accumulation with Fluid Inclusion Characteristics and Illite Dating in Yanqi Basin

作者：Fengxun Li · 年份：2009 · 被引用次数：2 · 研究领域：Hydrocarbon exploration and reservoir analysis、Geological and Geophysical Studies、Methane Hydrates and Related Phenomena

The fluid inclusions of Jurassic reservoir in Yanqi basin Northwest China mainly distributed in Sangonghe Formation and Badaowan Formation,its homogeneous temperature mostly was 101-110℃ and 121-130℃.The N-alkane carbon atomic numbers assumed two kurtosis in its inclusion component,the first main peak carbon was nC18 or nC20,the following main peak carbon was nC26 or nC27,these characteristics instructed that the basin occurred two oil-gas accumulation phases during the mid-late Jurassic;But the autogenetic illite isotope dating in its reservoir instructed similarly two oil-gas accumulation phase in the north depression of the Bohu sag,namely the Mid-Late Jurassic(142.26-183.15 Ma) and the Late Cretaceous(75.07-142.26 Ma),thereinto the oil-gas accumulation phases in the south topographic depression and the Benbutu structure belt respectively were the Mid Jurassic and the Mid-Late Jurassic-Early Cretaceous,the K-Ar dating increased with its burying depth in the identical structure belt on the longitudinal,which reflected that the oil-gas injected,migrated and adju-sted gradually from the low structure spot to the high structure spot.