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1、礦物巖石地球化學通報·研究成果·BulletinofMineralogy,PetrologyandGeochemistryVo1.35No.5,Sep.,2016四川盆地南部上二疊統(tǒng)龍?zhí)督M頁巖氣儲集層礦物組成特征及意義張吉振,李賢慶,王剛,楊杰,王元,徐紅衛(wèi),樊志偉中國礦業(yè)大學(北京)煤炭資源與安全開采國家重點實驗室,地球科學與測繪工程學院,北京100083摘要:為探討海陸過渡相頁巖儲集層海陸過渡相頁巖儲集層礦物對煤系頁巖氣生成、賦存的影響作用,對四川盆地南部龍?zhí)督M富有機質頁巖樣品,進行了x射線衍射分析、有機地球化學分析、孔隙度測試等。結果表明,龍?zhí)督M頁巖有機質豐度較高(TO
2、C含量為0.85%一35.7%),有機質成熟度達高.過成熟度階段(R=1.96%~2.40%),頁巖孔隙發(fā)育良好(孔隙度為3.14%一9.95%);龍?zhí)督M頁巖富含黏土礦物(含量為20.3%一92.3%),其次是石英(含量為4.2%~46.2%)和方解石(含量為0~40.3%),還含有少量長石、白云石、黃鐵礦、石膏等礦物,脆性礦物含量為6.3%一65.7%,多為20%~50%,脆性指數(shù)I、脆性指數(shù)Ⅱ平均值為24.2%、32.32%,達北美工業(yè)性開采頁巖壓裂下限。黏土礦物含量與頁巖孔隙度發(fā)育有密切相關性,兩者呈正相關關系,脆性礦物則相反。反映在龍?zhí)督M頁巖具有良好的頁巖氣形成的成熱
3、條件。關鍵詞:頁巖氣;礦物組成;有機質特征;上二疊統(tǒng);龍?zhí)督M;川南地區(qū)中圖分類號:P618.130.21文章編號:1007-2802(2016)05.0957.09doi:10.3969/j.issn.1007—2802.2016.05.016MineralCompositionsofUpperPermianLongtanFormationShaleinSouthernSichuanBasinandItsSignificanceforGasReservoirZHANGJi-zhen,LIXian—qing,WANGGang,YANGJie,WANGYuan,XUHong-we
4、i,F(xiàn)ANZhi—weiStateKeyLaboratoryofCoalResourcesand.sMining,CollegeofGeosciencegradSurveyingEngineering,ChinaUniversityofTechnology(Beijing),Beng100083,ChinaAbstract:Inordertostudythemineralcompositionsandbrittlenessofthemarine-terrigenousfaciesshalegasreservoirandtheroleofsuchmineralsinthegen
5、erationandoccurrenceofshalegas,theX—raydiffraction(XRD),organicgeo-chemicalanalysesandporositytestwereconductedonPermianLongtanFormationshaleintheSouthernSichuanbasininthispaper.TheresultsshowthattheLongtanFormationshaleinSouthernSichuanhasrelativelyhighorganiccarboncon—tent(TOC=0.85%一35.7%
6、),high-overthermalevolutionlevel(R。=1.95%一2.4%),goodporosity(3.14%一9.95%).Theyarecomposedofclayminerals(20.3%一92.3%),quartz(4.2%一46.2%)andcalcite(0-40.3%),withminorfeld-spar,dolomite,gypsum,pyrite.Thebrittlemineralcontentcanbe6.3%一65.7%(mainly20%一50%),andtheaveragevaluesofbrittlenessindexIa
7、ndthebrittlenessindexIIare24.2%and32.32%,respectively.whichhadreachedthelowerfracturelimitofNorthAmericanindustrialexploitation.ClaymineralsoftheLongtanFormationshalearecloselyre—latedtoporosityandshowpositivecorelationwithit,onthecontrary,contentofbritt