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1、2012年9月,第l8卷,第3期,433—437頁(yè)September2012,Vo1.18,No.3,P.433—437鄂爾多斯盆地東緣含煤地層水動(dòng)力條件及其控氣作用田文廣一,湯達(dá)禎,孫斌,趙素平,溫軍會(huì)1.中國(guó)地質(zhì)大學(xué)(北京)能源學(xué)院,北京100083;2.中國(guó)石油勘探開(kāi)發(fā)研究院廊坊分院,廊坊065007;3.陜西省地礦局區(qū)域地質(zhì)礦產(chǎn)研究院,成陽(yáng)712000摘要:鄂爾多斯盆地東緣南北跨度大,含煤地層水動(dòng)力區(qū)域分布規(guī)律不明?;诤旱貙雍畬臃植技翱诐B條件、煤層氣井產(chǎn)水量、產(chǎn)出水化學(xué)及同位素特征、煤層甲烷濃度等的分析,探討了區(qū)內(nèi)煤層氣生成和富集的水動(dòng)力條件
2、控制作用。結(jié)果顯示,砂巖含水層北部較南部發(fā)育,北部孔滲條件好于南部;太原組灰?guī)r含水層在三交一吉縣地區(qū)最為發(fā)育,導(dǎo)致山西組煤層含氣量高于太原組;煤層氣井產(chǎn)水量及產(chǎn)出水鈣、鎂離子含量北部高于南部,煤層含氣量與礦化度呈正相關(guān)關(guān)系。分析認(rèn)為,該區(qū)含煤地層水動(dòng)力條件在北部較南部活躍,北部地區(qū)的山西組水動(dòng)力強(qiáng)于太原組,三交一吉縣地區(qū)太原組水動(dòng)力強(qiáng)于山西組;在保德以南的中一高煤階區(qū),地下水弱徑流一滯留帶有利于煤層氣富集;在保德及其以北的中一低煤階區(qū),較活躍的水動(dòng)力條件和良好的封蓋條件為次生生物氣的生成和富集提供了關(guān)鍵條件。關(guān)鍵詞:鄂爾多斯盆地;煤層氣;水動(dòng)力;控氣作用中
3、圖分類(lèi)號(hào):P641.461文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1006—7493(2012)03—0433—05HydrodynamicConditionsandTheirControlsofGasinCoal-bearingStrataainEasternEdgeoftheOrdosBasin高TIANWenguang’。,TANGDazhen’,SUNBin,ZHAOSuping,WENJunhui。校1.SchoolofEnergyResources,ChinaUniversityofGeoseiences,Beijing100083,China;地2.Lang
4、fangBranchofPetroChinaExplorationandDevelopmentResearchInstitute,Langfang065007,China;a3.InstituteofRegionalGeologyandMineralResources,ShanxiBureauofGeologicalExploration,Xianyang712000,China質(zhì)Abstract:TheEastemedgeoftheOrdosbasinhasawidenorth—southspanwheretheregionalhydrodynamicc
5、onditionsarestill學(xué)S嘲unclear.Basedonthedataoftheporosity,permeability,drillingwaterproduction,hydro-chemicalandisotopecompositionandcoalbe報(bào)dme-錒thanefCBM)concentration,thecontrolofthehydrodynamicconditiontotheCBMgenerationandaccumulationintheareawasdiscussed.Itwasshownthatthesandst
6、oneaquifersandtheirporesandpermeabilitydevelopmuchwellinnorthpartofthebasinthaninitssouth.LimestoneaquifersintheTaiyuanFormationaremostdevelopedintheSanjiao—Jixianarea,resultinginthehigherCBMcontentoftheShanxiFormationthanthatoftheTaiyuanFormation.Drillingwaterproductionandthecalc
7、iumandmagnesiumionconcentrationsarehigherinthenorththaninthesouth.a(chǎn)ndthewatermineralizationiSpositivelycorrelatedt0CBMcontent.Itwasindicatedthatthegroundwaterintheareaismoreactiveinthenorththaninthesouth.HydrodynamicconditioninthenorthiSstrongerintheShanxiFormationthanintheTaiyuan
8、ForamtionbutitisoppositeintheSanj