石油勘探与开发2011，Vol.38Issue(4)：418-427,10.
四川盆地须家河组及侏罗系煤成气碳同位素组成
Carbon isotopic compositions of coal-derived gas in the Xujiahe Formation and Jurassic in the Sichuan Basin
摘要
Abstract
Coal-measure source rocks of Xujiahe Formation in the Sichuan Basin are important gas-source rocks, and provide sufficient natural gas for self-generation and self-storage gas reservoirs in the Xujiahe Formation and secondary gas reservoirs in the overlying Jurassic. The gas reservoirs in the Xujiahe Formation are mainly located in the western and central Sichuan gas provinces, while those in the Jurassic in the western Sichuan gas province. Natural gas derived from coal-measure source rocks in the Xujiahe Formation are typical thermogenic gas and shares the same characteristics of humic type gas. The carbon isotopic characteristics of gas samples in the Jurassic are generally identical to those in the Xujiahe Formation. The carbon isotopic compositions of the coal-derived gas tend to become lighter from bottom to top in the Xujiahe Formation. The gases in the Jurassic have no clear rule due to their coming from different members of the Xujiahe Formation, and they tend to accumulate near the source. Horizontally, the SliC values of alkane gas from the southern part of the western Sichuan gas province are heavier than those from the northern part, while both are obviously greater than those in the central and southern Sichuan gas provinces. Several gas samples in the Xujiahe Formation and Jurassic are characterized by partially reversed carbon isotopic series, mainly due to the influence of mixing of gas from the same source but different periods. The mixing of oil-associated gas not only reduces the δ13C values of several coal-derived gas samples in the central Sichuan gas province, but also causes the partial reversal of carbon isotopic series of some gas samples.关键词
四川盆地/须家河组/侏罗系/煤成气/碳同位素Key words
Sichuan Basin/ Xujiahe Formation/ Jurassic/ coal-derived gas/ carbon isotope分类
能源科技引用本文复制引用
吴小奇,黄士鹏,廖凤蓉,李振生..四川盆地须家河组及侏罗系煤成气碳同位素组成[J].石油勘探与开发,2011,38(4):418-427,10.基金项目
国家自然科学基金(40702021 （）
40972134) （）
中国科学技术大学研究生创新基金项目(KD2007061) （KD2007061）
