Hydrocarbon Generation Characteristics of Coal-measure Source Rocks and their Contribution to Natural Gas:A Case Study of Middle and Lower Jurassic Targets from the Southern Junggar Basin Margin  

作　　者：YU Miao GAO Gang LIU Miao MA Wanyun TIAN Anqi FAN Keting GUO Liulinbo HE Dan ZHANG Youjin 

机构地区：[1]College of Geosciences,China University of Petroleum,Beijing 102249,China [2]National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum,Beijing 102249,China [3]Research Institute of Experimental Testing,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China [4]Xinjiang Conglomerate Reservoir Laboratory,Karamay,Xinjiang 834000,China [5]Key Laboratory of Exploration and Development of Conglomerate Reservoirs,Karamay,Xinjiang 834000,China

出　　处：《Acta Geologica Sinica(English Edition)》2024年第5期1270-1284,共15页地质学报（英文版）

基　　金：financially supported by Xinjiang Oilfield Company of China(Grant No.2020-C4006)。

摘　　要：In order to study the hydrocarbon generation(HCGE)characteristics of coal-bearing basins,the coal-measure source rocks of the Middle Jurassic-Lower Jurassic(MLJ)of the piedmont thrust belt in the southern margin of the Junggar Basin in Northwest China are taken as research objects.More than 60 MLJ samples were collected from outcrops and wells.Total organic carbon(TOC),rock pyrolysis(Rock-Eval),organic petrological,vitrinite reflectance(%Ro),and hydrous pyrolysis were performed to analyze the relevant samples.The pyrolysis gases and liquid products were measured,and then the chemical composition,as well as carbon isotopes of the gases,were analyzed.The results indicate that the MLJ source rocks have the capacity for large-scale gas generation.In addition,for coal-measure source rocks,the heavier the carbon isotope of kerogen(δ^(13)C_(kerogen)),the lower the liquid hydrocarbon and hydrocarbon gas yield,and the easier it is to produce non-hydrocarbon gas.It is worth noting that when theδ^(13)C_(kerogen)in organic matter(OM)is relatively heavier,the fractionation of its products may become weaker in the evolutionary process.The vital contribution of the MLJ source rock to natural gas resources in the study area was further confirmed by comparing it with the Jurassic source gas.

关 键 词：upstream natural resources/energy coal-bearing basins source rock hydrous pyrolysis carbon isotope JURASSIC Xinjiang province 

分 类 号：P618.13[天文地球—矿床学]