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《四川盆地南部上二疊統(tǒng)龍?zhí)督M頁巖氣儲(chǔ)集層礦物組成特征及意義.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、礦物巖石地球化學(xué)通報(bào)·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(chǔ)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(xué)(北京)煤炭資源與安全開采國家重點(diǎn)實(shí)驗(yàn)室,地球科學(xué)與測繪工程學(xué)院,北京100083摘要:為探討海陸過渡相頁巖儲(chǔ)集層海陸過渡相頁巖儲(chǔ)集層礦物對(duì)煤系頁巖氣生成、賦存的影響作用,對(duì)四川盆地南部龍?zhí)督M富有機(jī)質(zhì)頁巖樣品,進(jìn)行了x射線衍射分析、有機(jī)地球化學(xué)分析、孔隙度測試等。結(jié)果表明,龍?zhí)督M頁巖有機(jī)質(zhì)豐度較高(TO
2、C含量為0.85%一35.7%),有機(jī)質(zhì)成熟度達(dá)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(dá)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(guān)性,兩者呈正相關(guān)關(guān)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(guān)鍵詞:頁巖氣;礦物組成;有機(jī)質(zhì)特征;上二疊統(tǒng);龍?zhí)督M;川南地區(qū)中圖分類號(hào):P618.130.21文章編號(hào):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