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1、2012年9月,第l8卷,第3期,479—484頁September2012,Vo1.18,No.3,P.479—484鄂爾多斯盆地東北緣保德地區(qū)煤層氣成因田文廣,湯達(dá)禎,王志麗,孫斌1.中國地質(zhì)大學(xué)(北京)能源學(xué)院,北京100083;2.中國石油勘探開發(fā)研究院廊坊分院,河北廊坊065007;3.渤海鉆探S-程有限公司第二錄井分公司,河北廊坊065007摘要:鄂爾多斯盆地東北緣保德地區(qū)煤層氣井組試采取得較好效果,但煤層氣成因尚未形成統(tǒng)一認(rèn)識(shí),影響到對(duì)區(qū)域煤層氣勘探開發(fā)潛力的進(jìn)一步認(rèn)識(shí)。本文基于各類煤層氣樣品組
2、分和穩(wěn)定同位素的分析,對(duì)其成因進(jìn)行了探討。結(jié)果表明,煤層氣組分以甲烷為主,重?zé)N濃度極低;813C明顯偏輕,部分813CCH4和8D分布在熱成因與二氧化碳還原型生物成因氣過渡區(qū)間;8t3C。相對(duì)較重,且與c之間存在負(fù)相關(guān)關(guān)系。分析認(rèn)為,該區(qū)煤層氣具有混合成因,以熱成因氣為主,兼具生物成因氣的特征,生物甲烷形成于二氧化碳還原途徑,煤層水的化學(xué)和動(dòng)力條件以及煤巖孔滲條件有利于產(chǎn)甲烷菌的大量繁殖。關(guān)鍵詞:煤層氣;成因;穩(wěn)定同位素;生物氣;鄂爾多斯盆地中圖分類號(hào):P618.11文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1006—7493
3、(2012)03—0479—06oOriginofCoalbedMethaneinBaode,NortheasternOrdosBasingaTIANWenguang’TANGDazhen’WANGZhili。,SUNBin高h(yuǎn),,盯1.SchoolofEnergyResourcesChinaUniversityofGeosciences,Beijing100083,China;校2.LangfangBranchofPetroChinaPetroleumExplorationandDevelopmentRes
4、earchInstitute,Langfang065007,China;3.BoHaiDrillingEngineeringCompanyLimeted,2thMudLoggingCompany,Hebei065007,China地aAbstr質(zhì)act:UTrialcoalbedmethanefCBM1productionofthewellgroupinBaodehasachievedarelativelysatisfactoryresultbuttheCBMg、elneVsisisstillunconfir
5、med.BasedonthedataofthecomponentsandstableisotopecompositionoftheCBMsampledfromthepro報(bào)duc.iSngwells,thegenesiswasdiscussed.ResultsshowedthattheCBMismainlycomposedofthemethanewithlittleheavyhydrocarbons.Carbonisotopiccompositionofthemethaneisobviouslylight,a
6、ndpartialdataofthecarbonandhydrogenisotopesofthemethaneplotwithinthetransitionalrangebetweenthethermogenicandbiogenicgases.Carbonisotopiccompositionofthecarbondioxideofthesamplesisrelativelyheavyandisnegativelycorrelatedtothecarbonisotopiccompositionoftheme
7、thane.Itwassuggestedthatthecoalbedmethaneintheareahasamixedthermogenieandbiogenicorigin,butthermogenicgasisthemainwithcompositionminorofbiogenicgas.Biogenicmethanewasformedthroughthereductionofcarbondioxide.Thechemistryandhydrodynamicsofthecoalbedwaterandth
8、eporosityandpermeabilityofthestrataintheareawerefavorableoftheactivepopulationofthemethanogenicbacteria.Keywords:coalbedmethane;origin;stableisotope;biogenicgas;OrdosBasinFirstauthor:TIANWenguang,Engin