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时间:2020-03-26
《鄂尔多斯盆地东北缘保德地区煤层气成因.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2012年9月,第l8卷,第3期,479—484页September2012,Vo1.18,No.3,P.479—484鄂尔多斯盆地东北缘保德地区煤层气成因田文广,汤达祯,王志丽,孙斌1.中国地质大学(北京)能源学院,北京100083;2.中国石油勘探开发研究院廊坊分院,河北廊坊065007;3.渤海钻探S-程有限公司第二录井分公司,河北廊坊065007摘要:鄂尔多斯盆地东北缘保德地区煤层气井组试采取得较好效果,但煤层气成因尚未形成统一认识,影响到对区域煤层气勘探开发潜力的进一步认识。本文基于各类煤层气样品组
2、分和稳定同位素的分析,对其成因进行了探讨。结果表明,煤层气组分以甲烷为主,重烃浓度极低;813C明显偏轻,部分813CCH4和8D分布在热成因与二氧化碳还原型生物成因气过渡区间;8t3C。相对较重,且与c之间存在负相关关系。分析认为,该区煤层气具有混合成因,以热成因气为主,兼具生物成因气的特征,生物甲烷形成于二氧化碳还原途径,煤层水的化学和动力条件以及煤岩孔渗条件有利于产甲烷菌的大量繁殖。关键词:煤层气;成因;稳定同位素;生物气;鄂尔多斯盆地中图分类号:P618.11文献标识码:A文章编号:1006—7493
3、(2012)03—0479—06oOriginofCoalbedMethaneinBaode,NortheasternOrdosBasingaTIANWenguang’TANGDazhen’WANGZhili。,SUNBin高h,,盯1.SchoolofEnergyResourcesChinaUniversityofGeosciences,Beijing100083,China;校2.LangfangBranchofPetroChinaPetroleumExplorationandDevelopmentRes
4、earchInstitute,Langfang065007,China;3.BoHaiDrillingEngineeringCompanyLimeted,2thMudLoggingCompany,Hebei065007,China地aAbstr质act:UTrialcoalbedmethanefCBM1productionofthewellgroupinBaodehasachievedarelativelysatisfactoryresultbuttheCBMg、elneVsisisstillunconfir
5、med.BasedonthedataofthecomponentsandstableisotopecompositionoftheCBMsampledfromthepro报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
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