【摘要】 鄂尔多斯盆地中部气田奥陶系风化壳天然气藏的气源问题是迄今尚有争议的重要问题。在前人大量研究的基础上,系统研究了该气田天然气混源的地球化学特征与标志,并利用多指标综合评价了气藏的气源。研究结果表明,鄂尔多斯盆地中部气田奥陶系风化壳天然气具有高—过成熟干气的组分和同位素特征。天然气的来源比较复杂,既有以石炭—二叠系来源为主的煤成气,又有以下古生界来源为主的油型气。该气田东部区块的天然气主要为煤成气,中部气田北部、西部及南部区块的天然气主要为油型气。更多还原

【Abstract】 Gas sources of Ordovician weathered crust gas reservoirs in Central Gas Field in the Ordos basin are an important problem that has not been c ompletely solved.On the basis of a la rge number of previous research,geochemical characteristics and in dexes of mixed origin natural gases f rom Ordovician weathered crust gas r eservoirs in Central Gas Field in the Ordos Basin are systematically studied.The gas sources from this gas field are also discussed through the comprehensiv e analyses of many indexes.The resul ts demonstrate that natural gases fr om Ordovician weathered crust reservo irs in Central Gas Field in the Ordos B asin have the characteristics of gas components and isotope composition s of high mature and over-mature dry g ases.In Central Gas Field in the Ordos Basin,there are both coal-formed gas and oil-type gas,the former of whic h comes from Permo-Carbonfierous coal measures and the latter originates f rom lower Paleozoic marine carbonate.The coal-formed gas is mainly located in the eastern part of Central Gas Field while oil-type gas lies in the northern,western and southern parts of Cen tral Gas Field in the Ordos Basin.更多还原