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ID:46535132
大小:1.71 MB
页数:9页
时间:2019-11-25
《鄂尔多斯盆地东缘构造-水文地质控气特征》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、2012年9月,第18卷,第3期,438—446页高校地质学报September2012,Vo1.18,No.3,P.438-446GeologicalJournalofChinaUniversities鄂尔多斯盆地东缘构造一水文地质控气特征姜波,许进鹏,朱奎,汪吉林,王继尧,屈争辉,李明中国矿业大学资源与地球科学学院,煤层气资源与成藏过程教育部重点实验室,徐州221116摘要:基于大量野外地质工作,结合钻孔抽水试验资料分析,探讨了鄂尔多斯盆地东缘构造、水文地质条件及其对煤层气保存的控制特征。结果显示,盆地边界近NS向的压性断裂和褶皱构造发育,构造变形程度向盆地内部逐渐减弱,即
2、盆地边缘和内部的构造条件均有利于煤层气保存。依据构造、地下水补给及排泄条件和地貌等特征,研究区可划分为5个水文地质单元,西南部韩城单元的水动力条件强于东部各水文地质单元,东部各单元中又以柳林泉流域水动力条件最强,这种差异在构造背景上的叠加,导致煤层气保存条件发生分异。中部黄河东断凹单元煤层含气量随埋藏深度的加深而增高,北部柳林单元在柳林泉以西发育有利煤层气保存的地下水动力场条件,中南部龙门山单元北部的地下水动力条件可能有利于煤层气保存,西南部韩城单元西北段地下水处于滞流环境而使煤层气保存条件较好。关键词:鄂尔多斯盆地;煤层气;构造;水文中图分类号:P542;P641.461文献
3、标识码:A文章编号: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
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