Application of butane geochemistry of natural gas in hydrocarbon exploration

查看全文 作　　者：Miao [1,2]Zhongying;Chen [2]Jianfa;Wang [3]Jing;Wang [2]Guannan;[4]ZhangChen;Li [2]Wei

机构地区：[1]Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;[2]State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;[3]Luliang Oilfield Operation District,PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;[4]Department of Natural Gas,PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,-China

出　　处：《Petroleum Science》索引2012年第9卷第4期,共8页

基　　金：supported by NSFC (Grant No. 41202100);the National Science and Technology Major Projects(Grant No. 2008ZX05007-003) 摘　　要：In order to distinguish the source and migration direction of natural gas by geochemical characteristics of butane,the components and carbon isotopes of natural gas from major hydrocarbonbearing basins in China were analyzed.The results showed that:(1) Oil-type gas has i-C 4 /n-C 4 <0.8,δ 13 C butane <-28‰,δ 13 C i-butane <-27‰,δ 13 C n-butane <-28.5‰,whereas coal-type gas has i-C 4 /n-C 4 >0.8,δ 13 C butane >-25.5‰,δ 13 C i-butane >-24‰,δ 13 C n-butane >-26‰.(2) When δ 13 C i-butane-δ 13 C n-butane is greater than 0,the maturity of oil-type gas is generally more than 2.4% and that of coal-type gas is greater than 1.4%,whereas when the difference is less than 0,the maturity of oil-type gas is generally less than 1.1% and that of coal-type gas is less than 0.8%.(3) When natural gas migrates through dense cap rocks,the value of i-C 4 /n-C 4 increases,whereas when it migrates laterally along a reservoir,the value of i-C 4 /n-C 4 decreases.(4) Sapropelic transition zone gas with composition and carbon isotopic signatures similar to those of oil-type gas in the low thermal evolution stage is found to have a relatively high butane content.(5) The values of i-C 4 /n-C 4 and δ 13 C n-butane δ 13 C i-butane of gas which has suffered biological degradation are significantly higher than those obtained from thermogenic and bio-thermocatalytic transition zone gas.Thus,natural gas of different genetic types can be recognized through component analysis and carbon isotopic signatures of butane,the natural gas maturity can be estimated from the difference in carbon isotopic content between isobutane and n-butane,and the migration direction of natural gas can be determined from i-C 4 /n-C 4 ratios and transport conditions,which can also be used to thermogenic and bio-thermocatalytic transition zone gas. 关键词：天然气地球化学异丁烷油气勘探碳同位素 n-丁烷应用地球化学特征生物降解

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Application of butane geochemistry of natural gas in hydrocarbon exploration

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