Geochemistry and origins of hydrogen-containing natural gases in deep Songliao Basin,China:Insights from continental scientific drilling  

作　　者：Shuang-Biao Han Chao-Han Xiang Xin Du Lin-Feng Xie Jie Huang Cheng-Shan Wang 

机构地区：[1]College of Geoscience and Surveying Engineering,China University of Mining and Technology,Beijing,100083,China [2]State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Beijing,100083,China

出　　处：《Petroleum Science》2024年第2期741-751,共11页石油科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.42072168);the National Key R&D Program of China(Grant No.2019YFC0605405);the Fundamental Research Funds for the Central Universities(Grant No.2023ZKPYDC07)。

摘　　要：The different reservoirs in deep Songliao Basin have non-homogeneous lithologies and include multiple layers with a high content of hydrogen gas.The gas composition and stable isotope characteristics vary significantly,but the origin analysis of different gas types has previously been weak.Based on the geochemical parameters of gas samples from different depths and the analysis of geological settings,this research covers the diverse origins of natural gas in different strata.The gas components are mainly methane with a small amount of C_(2+),and non-hydrocarbon gases,including nitrogen(N_(2)),hydrogen(H_(2)),carbon dioxide(CO_(2)),and helium(He).At greater depth,the carbon isotope of methane becomes heavier,and the hydrogen isotope points to a lacustrine sedimentary environment.With increasing depth,the origins of N_(2)and CO_(2)change gradually from a mixture of organic and inorganic to inorganic.The origins of hydrogen gas are complex and include organic sources,water radiolysis,water-rock(Fe^(2+)-containing minerals)reactions,and mantle-derived.The shales of Denglouku and Shahezi Formations,as source rocks,provide the premise for generation and occurrence of organic gas.Furthermore,the deep faults and fluid activities in Basement Formation control the generation and migration of mantle-derived gas.The discovery of a high content of H_(2)in study area not only reveals the organic and inorganic association of natural-gas generation,but also provides a scientific basis for the exploration of deep hydrogen-rich gas.

关 键 词：Gas compositions Stable isotopes Gas origins Hydrogen gas Songliao Basin 

分 类 号：P618.13[天文地球—矿床学] P634[天文地球—地质学]