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《Geology-geochemistry》 2001-01
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CARBON ISOTOPIC COMPOSITION AND ORIGIN OF CARBON DIOXIDE IN NATURAL GASES IN NORTHERN AND CENTRAL TARIM BASIN

Wang Guo'an\+\{1,2)\}\ Shen Jianzhong\+\{2)\}\ Ji Meiying\+\{2)\} 1) (Institute of Geology, Chinese Academy of Sciences, Beijing 100029) 2) (Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 73000)  
Carbon dioxide is one of the non\|hydrocarbons which occur in natural gases in northern and central Tarim Basin. The \{δ\{\}\+\{13\}C\} values of carbon dioxide are different from one oil (gas) field to another, but all the \{δ\{\}\+\{13\}C\} values of carbon dioxide from the same oil (gases) field imply that CO\-2 is relatively homogeneous in origin. The five \{δ\{\}\+\{13\}C\} values of carbon dioxide in central Tarim Basin are within the carbon isotopic range of abiogenic carbon dioxide ,and the carbon dioxide probably has two sources : one originated from the decomposition of hydrocarbon\|source rocks or carbonate minerals and carbonate cements in the hydrocarbon\|source rocks, and the other from degassing during Permian volcanism in central Tarim Basin. Carbon dioxide in natural gases from oil (gas) deposits (except Xa\|Ke\|La oil (gas) field) in the Luntai salient originated from the Permian\|Jurassic continental facies hydrocarbon\|source rocks. The contents of CO\-2 in natural gases from the Denhetang oil (gas) field are very high ,and the \{δ\{\}\+\{13\}C\} values are within the carbon isotopic range of abiogenic carbon dioxide ,and carbon dioxide was derived from decomposition of the Cambrian\|Ordovician marine facies carbonate rocks and carbonate minerals in mudstones.
【Fund】: 国家“九五”科技攻关项目
【CateGory Index】: P597.2
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