四川盆地通南巴構(gòu)造帶陸相層系氣藏的氣源與成藏期分析
[Abstract]:Important progress has been made in the study of natural gas in continental strata in northeast Sichuan, but the characteristics of natural gas composition of continental strata in Tongnanba structure of Sichuan Basin are quite complex, the understanding of gas source has always been controversial, and the time of reservoir formation is still unclear. Based on the analysis of the geological and geochemical characteristics of typical gas reservoirs in northeast Sichuan, the gas source and gas accumulation period of continental strata of Tongnanba structure are discussed. The results show that the natural gas of continental strata in the study area is mainly composed of hydrocarbon compounds, with a low non-hydrocarbon content and a methane content of more than 95%. It is a mixture of marine and continental gas sources, mainly derived from the contribution of the source rocks of the Xujiahe formation and the artesian well formation in the continental strata. The different gas bearing formations in the continental stratigraphic system of Tongnanba structure generally experienced two stages of reservoir formation: (1) the Xujiahe formation was from the early Middle Jurassic to the middle Jurassic. In the middle of early Cretaceous, there were one reservoir forming event in each group; (2) one reservoir forming event occurred in early Middle Jurassic to early late Jurassic, and one in early Cretaceous.
【作者單位】: 中國石油大學(xué)(北京)地球科學(xué)學(xué)院;油氣資源與探測國家重點實驗室;中國石油天然氣股份有限公司華北油田分公司地球物理勘探研究院;
【基金】:“十二五”國家科技重大專項(編號:2011ZX05002-006)資助
【分類號】:P618.13
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