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1、2012年9月,第18卷,第3期,438—446頁高校地質(zhì)學(xué)報September2012,Vo1.18,No.3,P.438-446GeologicalJournalofChinaUniversities鄂爾多斯盆地東緣構(gòu)造一水文地質(zhì)控氣特征姜波,許進(jìn)鵬,朱奎,汪吉林,王繼堯,屈爭輝,李明中國礦業(yè)大學(xué)資源與地球科學(xué)學(xué)院,煤層氣資源與成藏過程教育部重點實驗室,徐州221116摘要:基于大量野外地質(zhì)工作,結(jié)合鉆孔抽水試驗資料分析,探討了鄂爾多斯盆地東緣構(gòu)造、水文地質(zhì)條件及其對煤層氣保存的控制特征。結(jié)果顯示,盆地邊界近NS向的壓性斷裂和褶皺構(gòu)造發(fā)育,構(gòu)造變形程度向盆地內(nèi)部逐漸減弱,即
2、盆地邊緣和內(nèi)部的構(gòu)造條件均有利于煤層氣保存。依據(jù)構(gòu)造、地下水補(bǔ)給及排泄條件和地貌等特征,研究區(qū)可劃分為5個水文地質(zhì)單元,西南部韓城單元的水動力條件強(qiáng)于東部各水文地質(zhì)單元,東部各單元中又以柳林泉流域水動力條件最強(qiáng),這種差異在構(gòu)造背景上的疊加,導(dǎo)致煤層氣保存條件發(fā)生分異。中部黃河?xùn)|斷凹單元煤層含氣量隨埋藏深度的加深而增高,北部柳林單元在柳林泉以西發(fā)育有利煤層氣保存的地下水動力場條件,中南部龍門山單元北部的地下水動力條件可能有利于煤層氣保存,西南部韓城單元西北段地下水處于滯流環(huán)境而使煤層氣保存條件較好。關(guān)鍵詞:鄂爾多斯盆地;煤層氣;構(gòu)造;水文中圖分類號:P542;P641.461文獻(xiàn)
3、標(biāo)識碼:A文章編號:1006—7493(2012)03—0438—09StructuralandHydrOge0l0gicalControlsofCoalbedMethanePreservationintheEasternOrdosBasinJIANGBo,XUJinpeng,ZHUKui,WANGJilin,WANGJiyao,QUZhenghui,LIMingSchoolofResourceandEarthScience,ChinaUniversityofMiningandTechnology,andKeyLaboratoryofCoalbedMethaneResource
4、andReservoirFormationProcess(CUMT),MinistryofEducation,Xuzhou221116,ChinaAbstract:Basedonfieldinvestigationanddataofboreholepumpingtest,thestructure,hydrogeologyandtheircontrolstotheCOalbedmethane(CBM)preservationineasternmar~noftheOrdOSbasinwerediscussed.Resultsshowedthatthecompressionfault
5、sandfoldswithnearlysouth—northdirectiondevelopwellinthebasinmargins,andthetectonicdeformationweakengraduallytowardsthecenterofthebasin,whichindicatesthestructurebothinthemarginandcenterofthebasinisallconducivetotheCBMpreservation.Fivehydrologicalunitsintheareaweredistinguishedbasedonthegeomo
6、rphologicalandgeologicalconditionssuchasthestructureandgroundwaterrechargeanddischarge.HydrodynamicinsouthwesternHanchengunitisstrongerthanthatinotherunitsintheeastern,andthatintheLiulinunitisstrongestamongtheeasternunits.Superpositionofthehydrodynamicvariationonthetectonicsettingmakesthedif
7、ferentiationofCBMpreservationconditions.CBMcontentinmiddleYellowRiverdepressionincreaseswiththeincreaseoftheburialdepth.HydrodynamicfavorabletoCBMpreservationinnorthernLiulinunitOccursatthewesternpartoftheLiulinSpringintheunit.Groundwaterdynamicatt