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时间:2020-03-26
《鄂尔多斯盆地南部侏罗系煤层气成因探究.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、第24卷第5期中国矿业Vo1.24。No.52O15年5月CHINAMININGMAGAZINEMay2015鄂尔多斯盆地南部侏罗系煤层气成因探究田文广,邵龙义,张继东,赵素平,霍万国。(1.中国矿业大学(北京),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.中国石油渤海钻探井下作业公司第一试油_7-程作业部,河北廊坊065O07)摘要:鄂尔多斯盆地南部侏罗系具有较好的煤层气勘探潜力,但煤层气成因有待深人研究,弄清楚其成因类型能够有效指导该区下一步勘探开发方向。基于区域地质条件、煤层气样品组分、稳定
2、同位素等分析,对其成因进行了探讨。结果表明,研究区浅部的彬县、焦坪、黄陵地区煤层气6C。n一般介于一81%o~一57%。,煤层气干燥系数一般大于100,8Dc“一般介于一236‰~一234‰,煤层气为晚期生物成因,同时,地层水矿化度低,煤岩孔隙度较高,渗透性较好,具备生物气生成的地质条件;深部合水一宁县地区煤层气6”C.一般介于一49‰~一35‰,煤层气干燥系数一般小于100,是典型的热成因气,地层水矿化度高,呈酸性,不利于生物气的生成。关键词:鄂尔多斯盆地;侏罗系;煤层气;成因中图分类号:P536文献标识码:A文章编号:1004—
3、4051(2015)05—008l-O5AnalysisofgenetictypesofthecoalbedmethaneofJurassicformation,SouthernOrdosBasinTIANWewguang,SHAOLong—yi,ZHANGJi—dong,ZHAOSu—ping,HUOWan-guo。(1.ChinaUniversityofMiningandTechnology(Beijing),Beijing100083,China;2.ResearchInstituteofPetroleumExploratio
4、nandDevelopment—Langfang,Langfang065007,China;3.TheFirstOilTestEngineeringOperations,DownholeServicesCompanyBHDC,ChinaNationalPetroleumCorporation,Langfang065007,China)Abstract:ExplorationactivitieshaveprovedthatJurassicFormationofSouthOrdosBasinhasgreatpotentialofCBM(
5、eoalbedmethane),toclarifythegenetictypeoftheCBMcaneffectivelyguidethefurtherexploration,forthispurpose,thegeologiccharactersoftheformation,thegassamplesandstableisotopeoftheCBMwereanalyzed,andtheresultsshowthatthe8”CcH.valueoftheshallowlayersofBinCounty,Jiao—pingandHua
6、nglingarearangebetween一81%o~一57‰,thedryfactorsaremainlyabove100,3DcHmostlydistributebetween-236%o~一234~0,allthefeaturesaboveprovedthattheCBMisbiogenesisgas,andthereservoiroftheseareaischaracterizedby1OWwatersalinityandrelativelygoodpenetrationcondition,whichisfavorable
7、forbiogenesisgas’sgeneration.WhileforthedeeperzoneofHeShui—NingCountyarea,the6。CcHvaluerangedfrom~49%o0~一35%o,theCBMdryfactorsarelessthan100,whichistypically.thermogenicgas,andalso,itsformationwaterisnotconducivetothegenerationofbiogenicgasbecauseofthehighsalinityandac
8、idicproperty.Keywords:OrdosBasin;Jurassicformation;CBM(coalbedmethane);genetictype鄂尔多斯盆地南部侏罗系煤层分布广泛,厚度层气勘探潜力。但该区煤层气成因
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