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1、第42卷第4期煤田地質(zhì)與勘探Vl01.42N0.42014年8月CoALGE0I.0GY&ElXP10RfⅢ0NAug.2014文章編號:1001-1986(2014)04.0031-05鄂爾多斯盆地黃陵北部延安組頁巖氣勘探潛力分析李智學,一,邵龍義,李明培3,陳飛(1.中國礦業(yè)大學地球科學與測繪工程學院,北京100083;2.陜西能源集團有限公司,陜西西安710061;3.陜西煤田地質(zhì)局勘察院,陜西西安710054)摘要:鄂爾多斯盆地中南部發(fā)育有侏羅系延安組第二段和第三段陸相暗色厚層泥巖層系,礦物成分以石英、黏土為主,石
2、英43%~56%,黏土礦物29%~33%。總有機~(TOC)I.63%~3.89%,有機質(zhì)成熟度。為0.59%~0.60%,含氣量(CH4)0.25~0.85m/t,等溫吸附實驗表明延安組泥巖的甲烷吸附能力與總有機碳含量呈正相關關系。泥巖處于生物成因氣階段,具備頁巖氣形成的基本地質(zhì)條件,并可對比美國密歇根盆地Antrim頁巖和伊利諾斯盆地的NewAlbany頁巖的地質(zhì)條件。為查清黃陵北部侏羅系延安組頁巖氣的勘探潛力,通過分析勘查和化驗測試資料,對其頁巖氣勘探潛力進一步評價認為:黃陵北部延安組泥巖分布范圍和厚度較大,已進入生
3、物成因氣和熱催化生氣的中間階段,有機質(zhì)豐度較高,具備形成頁巖氣的成藏條件,頁巖氣潛力巨大。關鍵詞:脆性礦物;有機碳;成熟度;頁巖氣;陸相地層;鄂爾多斯盆地中圖分類號:TEl32.2;P618.13文獻標識碼:ADOI:10.3969/j.issn.1001.1986.2014.04.007Analysisofshale2asresourceexplorationpotentialofYan’anFormationinnorthernHuanglingminingareaof0rdosbasinLIZhixue,SHAOLo
4、ngyi,LIMingpei,CHENFei(1.SchoolofGeoscienceandSurveyEngineering,ChinaUniversityofMiningandTechnology,Beijing100083,China;2.ShaanxiEnergyGroupCo.,Ltd,Xi'an710061,China;3.InvestigationResearchInstituteofShaanxiCoalGeologyBureau,Xi'an710054,China)Abstract:0rdosbasini
5、soneoftheimportantenergYresourcebasinsinChina.ThesecondandthirdmembersofJurassicYan’anFormationinnorthernHuanglingminingareaofthesouth—centralOrdosbasincontainathicksuccessionofcontinentaldarkmudstone.Themineralsofthemudstonearedominatedbyqua~zandclayminerals,with
6、qua~zcontent43%一56%.claycontentranging29%一33%.Thetotalorganiccarbon(TOC)contentofthemudstoneis1.63%-3.89%,theorganicmaturityischaracterizedbyo0fO.59%-0.60%,andgas(CH4)contentis0.25~0.85m/t.TheisothermaladsorptiontestshowedthatgasadsorptioncapacityofthemudstonesinY
7、an’anFormationhadapositivecorrelationwithTOC.Thegasisbiogenicandpossessedthebasicgeologicalconditionsofshalegasformation.ThecharacteristicsofthemudstonecanbecomparedwithNewAlbanyShaleinMichiganbasinandAntrimShaleinIllinoisbasinofAmerica.Inordertoassesstheshalegasr
8、esourcepotentialofYan’anFormationinnorthernHuanglingminingarea,theexplorationdataandlaboratoryexperimentdatawereanalyzed.Apreliminaryassessmentofgasreso