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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(hào):1001-1986(2014)04.0031-05鄂爾多斯盆地黃陵北部延安組頁(yè)巖氣勘探潛力分析李智學(xué),一,邵龍義,李明培3,陳飛(1.中國(guó)礦業(yè)大學(xué)地球科學(xué)與測(cè)繪工程學(xué)院,北京100083;2.陜西能源集團(tuán)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%??傆袡C(jī)~(TOC)I.63%~3.89%,有機(jī)質(zhì)成熟度。為0.59%~0.60%,含氣量(CH4)0.25~0.85m/t,等溫吸附實(shí)驗(yàn)表明延安組泥巖的甲烷吸附能力與總有機(jī)碳含量呈正相關(guān)關(guān)系。泥巖處于生物成因氣階段,具備頁(yè)巖氣形成的基本地質(zhì)條件,并可對(duì)比美國(guó)密歇根盆地Antrim頁(yè)巖和伊利諾斯盆地的NewAlbany頁(yè)巖的地質(zhì)條件。為查清黃陵北部侏羅系延安組頁(yè)巖氣的勘探潛力,通過(guò)分析勘查和化驗(yàn)測(cè)試資料,對(duì)其頁(yè)巖氣勘探潛力進(jìn)一步評(píng)價(jià)認(rèn)為:黃陵北部延安組泥巖分布范圍和厚度較大,已進(jìn)入生
3、物成因氣和熱催化生氣的中間階段,有機(jī)質(zhì)豐度較高,具備形成頁(yè)巖氣的成藏條件,頁(yè)巖氣潛力巨大。關(guān)鍵詞:脆性礦物;有機(jī)碳;成熟度;頁(yè)巖氣;陸相地層;鄂爾多斯盆地中圖分類號(hào):TEl32.2;P618.13文獻(xiàn)標(biāo)識(shí)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