东濮凹陷濮卫地区天然气成因与来源  

Origin and source of natural gas in Puwei area of Dongpu depression

作　　者：张国强 欧光习[1] 陈践发[2] 徐田武[3] 吴迪[1] 马剑 张磊[1] ZHANG Guoqiang;OU Guangxi;CHEN Jianfa;XU Tianwu;WU Di;MA Jian;ZHANG Lei(Beijing Research Institute of Uranium Geology,Beijing 100029,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;Research Institute of Exploration and Development,Zhongyuan Oilfield Company,Puyang,Henan 457001,China)

机构地区：[1]核工业北京地质研究院,北京100029 [2]油气资源与探测国家重点实验室中国石油大学(北京),北京102249 [3]中国石化中原油田分公司勘探开发研究院,河南濮阳457001

出　　处：《世界核地质科学》2021年第2期218-228,共11页World Nuclear Geoscience

摘　　要：通过对东濮凹陷濮卫地区天然气组分、碳氢同位素特征分析,探讨了研究区天然气地球化学特征、成因及来源。研究区天然气中主要以甲烷为主,重烃气含量较高,天然气干燥系数(C1/C1-5)大部分小于0.95,为典型的湿气。天然气δ^(13)C1集中分布在-41.9‰~-28.4‰,δ^(13)C2集中分布在-29.3‰~-23.1‰,δ^(13)C3集中分布在-28.3‰~-21.3‰,δ^(13)C4集中分布在-27.6‰~-23.4‰。表明研究区天然气主要为有机成因的煤型气,含少部分油型气及混合气。气源对比研究表明,卫城气田天然气为典型的混合气,主要来源于沙三、沙四段湖相烃源岩,混有部分深部石炭-二叠系的高熟阶段的煤型气。户部寨气田天然气为典型的煤型气,来源于深部石炭-二叠系的高熟阶段煤型气。濮城气田天然气类型较多,油型气来源于沙三、沙四段湖相烃源岩,煤型气来源于深部石炭-二叠系的高熟阶段煤型气,混合气则为以上两处烃源岩混合来源。Based on the analysis of natural gas composition,carbon and hydrogen isotope characteristics,this paper discussed the geochemical characteristics,origin and source of natural gas in Puwei area of Dongpu depression.The natural gas in the study area was found mainly methane with a high content of heavy hydrocarbon gas,the dryness coefficient of natural gas(C1/C1-5)was mostly less than 0.95,which is typical wet gas.The natural gas was tested with δ^(13)C1 concentrated in the range of-41.9‰~-28.4‰,δ^(13)C2 concentrated in the range of-29.3‰~-23.1‰,δ^(13)C3 concentrated in the range of-28.3‰~-21.3‰,and δ^(13)C4 concentrated in the range of-27.6‰~-23.4‰.It showed that the natural gas in the study area was mainly coal gas of organic origin and contained a small part of oil gas and mixture gas.The gas source correlation study showed that the natural gas in Weicheng gas field was a typical mixed gas,which mainly came from Es3 and Es4 lacustrine source rocks and was mixed with some deep carboniferous and Permian coal-type gas of high maturity stage.The natural gas in Hubuzhai gas field is a typical coal-type gas,which came from the high maturity coal-type gas in deep Carboniferous-Permian System.There are many types of natural gas in Pucheng gas field.Oil-type gas came from Es3 and Es4 lacustrine source rocks,coal-type gas came from deep Carboniferous-Permian System highmaturity coal-type gas,and mixed gas comes from the mixed sources of the above two source rocks.

关 键 词：东濮凹陷 濮卫地区 天然气成因 天然气同位素 煤型气 油型气 

分 类 号：P618.13[天文地球—矿床学]