鄂尔多斯盆地中部气田奥陶系风化壳气藏天然气来源及混源比计算  

Gas Sources and Mixing Ratio of Ordovician Weathering Crust Reservoir of Central Gas Field in Ordos Basin

作　　者：夏新宇[1,2] 赵林[1,2] 戴金星 张文正[1,2] 李剑峰 

机构地区：[1]石油勘探开发研究院 [2]长庆勘探开发研究院

出　　处：《沉积学报》1998年第3期75-79,共5页Acta Sedimentologica Sinica

摘　　要：对鄂尔多斯盆地中部气田天然气碳同位素资料按不同地区、不同层位进行了分析，认为奥陶系风化壳气藏甲烷碳同位素值与石炭—二叠系气藏的接近，在平面上变化趋势相似，而与风化壳之下奥陶系自生自储的油型气相差较大。奥陶系风化壳气藏的来源是以石炭—二叠系煤成气为主，定量计算表明，在中部气田的大部分地区，石炭—二叠系来源气的比例大于７０％。According to the distribution of the carbon isotopic composition data of over 140 gas samples in different places and different beds in Ordos basin,natural gas in the Ordovician weathering crust is more close to the Carboniferous Permian coal typed gas rather than to the Ordovician oil typed gas represented by the gas in the reservoir under the weathering crust.Plenary distribution of methane carbon isotopic composition of weathering crust gas has a similar feature with that of Carboniferous Permian gas.Calculation result shows that over 70% of the gas in weathering crust in the Central gas field is from Carboniferous Permian beds.

关 键 词：天然气成因 甲烷 碳同位素 气田 风化壳 气藏 

分 类 号：P618.130.1[天文地球—矿床学]