鄂尔多斯盆地东北部天然气地球化学特征及成藏分析  

Geochemical characteristics and accumulation analysis of natural gas in northeastern Ordos Basin

作　　者：杨丽丽 徐飞 陈斗 杨皓铭 王春雷 韩旭 YANG Lili;XU Fei;CHEN Dou;YANG Haoming;WANG Chunlei;HAN Xu(Changqing Branch,China Petroleum Logging Co.Ltd.,Xi’an 710201,Shaanxi;Technical Center,CNLC,Xi’an 710201,Shaanxi;Training Center,CNLC,Xi’an 710201,Shaanxi)

机构地区：[1]中国石油测井有限公司长庆分公司,陕西西安710201 [2]中国石油集团测井有限公司技术中心,陕西西安710201 [3]中国石油集团测井有限公司培训中心,陕西西安710201

出　　处：《长江大学学报（自然科学版）》2022年第5期18-26,共9页Journal of Yangtze University(Natural Science Edition)

基　　金：国家科技重大专项“鄂尔多斯盆地大型岩性地层油气藏勘探开发示范工程”(2016ZX05050)。

摘　　要：为了明确鄂尔多斯盆地东北部上古生界天然气来源及成藏特征,以地球化学实验和包裹体分析实验为手段,结合埋藏热演化史研究,探讨了研究区天然气的成因、地球化学特征及成藏特征。研究结果表明,鄂尔多斯盆地东北部上古生界天然气中甲烷含量主频分布为94%,非烃组分含量一般小于0.2%,干气为主、湿气为辅,具有同源性;天然气类型主要为煤型气,混合了部分油型气,来源于二叠系太原组和山西组煤系烃源岩;研究区天然气经历了早侏罗世、晚侏罗世至早白垩世共两期生烃,其中晚侏罗世至早白垩世为主力生烃期,具有近源邻源充注成藏的特点;天然气成藏受控于构造运动,古生界的裂缝和断层为天然气运移的良好通道,由煤系烃源岩生成烃类物质后向上进入优质储层,发生规模性天然气聚集成藏。In order to clarify the source and accumulation characteristics of natural gas in the Upper Paleozoic in northeastern Ordos Basin,the genesis,geochemical characteristics and accumulation characteristics of natural gas in the study area were discussed by means of geochemical experiments and inclusion analysis experiments combined with burial thermal evolution history.The results show that the main frequency distribution of methane content in the Upper Paleozoic natural gas in the northeastern Ordos Basin is 94%,and the content of non-hydrocarbon components is generally less than 0.2%.Dry gas is the main gas,and wet gas is the auxiliary with homology.The main type of natural gas is coal type gas,mixed with some oil type gas,which comes from coal measure source rocks of Permian Taiyuan Formation and Shanxi Formation.The natural gas in the study area has experienced two periods of hydrocarbon generation,including early Jurassic and late Jurassic to early Cretaceous.The main period of hydrocarbon generation is from late Jurassic to early Cretaceous,which has the characteristics of near source and adjacent source charging.Natural gas accumulation is controlled by tectonic movement,and fractures and faults of Paleozoic are good channels for natural gas migration.Hydrocarbon materials generated from coal measure source rocks enter high-quality reservoirs,resulting in large-scale natural gas accumulation.

关 键 词：古生界 天然气 鄂尔多斯盆地 地球化学 成因分析 

分 类 号：P59[天文地球—地球化学] TE121[天文地球—地质学]