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1、第24卷第5期中國礦業(yè)Vo1.24。No.52O15年5月CHINAMININGMAGAZINEMay2015鄂爾多斯盆地南部侏羅系煤層氣成因探究田文廣,邵龍義,張繼東,趙素平,霍萬國。(1.中國礦業(yè)大學(xué)(北京),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.中國石油渤海鉆探井下作業(yè)公司第一試油_7-程作業(yè)部,河北廊坊065O07)摘要:鄂爾多斯盆地南部侏羅系具有較好的煤層氣勘探潛力,但煤層氣成因有待深人研究,弄清楚其成因類型能夠有效指導(dǎo)該區(qū)下一步勘探開發(fā)方向?;趨^(qū)域地質(zhì)條件、煤層氣樣品組分、穩(wěn)定
2、同位素等分析,對(duì)其成因進(jìn)行了探討。結(jié)果表明,研究區(qū)淺部的彬縣、焦坪、黃陵地區(qū)煤層氣6C。n一般介于一81%o~一57%。,煤層氣干燥系數(shù)一般大于100,8Dc“一般介于一236‰~一234‰,煤層氣為晚期生物成因,同時(shí),地層水礦化度低,煤巖孔隙度較高,滲透性較好,具備生物氣生成的地質(zhì)條件;深部合水一寧縣地區(qū)煤層氣6”C.一般介于一49‰~一35‰,煤層氣干燥系數(shù)一般小于100,是典型的熱成因氣,地層水礦化度高,呈酸性,不利于生物氣的生成。關(guān)鍵詞:鄂爾多斯盆地;侏羅系;煤層氣;成因中圖分類號(hào):P536文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):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鄂爾多斯盆地南部侏羅系煤層分布廣泛,厚度層氣勘探潛力。但該區(qū)煤層氣成因