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1、第25卷第1O期中國礦業(yè)Vo1.25.No.1020t6年1O月CHINAMININGMAGAZINE0ct20l6威利斯頓盆地巴肯組泥頁巖排烴效率地質(zhì)研究胡瑩,盧雙舫,李文浩,張鵬飛,張晗,李倩(1.中國石油大學(華東)非常規(guī)油氣與新能源研究院,山東青島266580;2.中國石油大學(華東)地球科學與技術(shù)學院,山東青島266580)摘要:為了弄清造成威利斯頓盆地巴肯組泥頁巖相對含油量低,而致密砂(灰)巖中含油量高的原因,對巴肯組泥頁巖的排烴特征進行研究具有重要的意義。本文在油氣勘探相關(guān)資料的分析基礎(chǔ)上,結(jié)合薄片鑒定和地球化學分析方法,探討了巴
2、肯組泥頁巖的排烴特征。結(jié)果表明,巴肯組泥頁巖的高排烴效率是造成巴肯組中段致密層段相對含油量高、而泥頁巖相對含油量較低的根本原因。巴肯組泥頁巖產(chǎn)率指數(shù)與其有機碳含量的明顯不匹配,可溶有機質(zhì)族組成的低飽/芳值以及巴肯組中段粉砂質(zhì)白云巖強熒光性都說明巴肯組泥頁巖發(fā)生過大量的排烴。泥頁巖的生烴增壓引起的超壓誘導(dǎo)泥頁巖產(chǎn)生的微裂縫與干酪根網(wǎng)絡(luò)構(gòu)成了石油初次運移的通道,也利于泥頁巖排烴。關(guān)鍵詞:致密油;含油量;排烴效率;巴肯組;威利斯頓盆地中圖分類號:P59文獻標識碼:A文章編號:1004—4051(2O16)10-0163一O5Geologicalres
3、earchonhydrocarbonexpulsionefficiencyofshaleinBakkenFormationintheWillistonBasinHUYing,LUShuang—fang,LIWen-hao,ZHANGPeng—fei,ZHANGHan,LIQian’(1.ResearchInstituteofUnconventionalHydrocarbonandRenewableEnergy,ChinaUniversityofPetroleum(EastChina),Qingdao266580,China;2.Schoolof
4、Geosciences,ChinaUniversityofPetroleum(EastChina),Qingdao266580,China)Abstract:TofindoutthecauseofrelativelylOWoi1contentoftheshaleandhighoi1contentindensezoneinbakkenformationintheWillistonbasin,isofgreatsignificanceinordertOrevealthecharacteristicsofhydrocarbonexpulsionofs
5、haleinbakkenformation.Throughthedetailedanalysisofbasicgeologicaldataofpetroleumexploration,combinedthemethodsofthinsectionandgeochemistry,thecharacteristicsofhydrocarbonexpulsionofshaleinbakkenformationisdiscussed.Theresultsareshowedasbelow:highhydrocarbonexpulsionefficienc
6、yofshaleistherootcauseofrelativelyhighoilcontentinthemiddledensezoneandlowoilcontentofshale.Thedismatchesbetweenproductionrateindexandorganiccarboncontent,thelowratioofsaturatedhydrocarbonandaromatichydrocarbonofsolubleorganicmatter,aswellasstrongfluorescenceofsiltydolomitei
7、nthemiddlebakkengroup,suggestthattheshaleinbakkenformationhavehappenedalotofhydrocarbonexpulsion.Microfractureandkerogennetworkinductedbyoverpressurecausedbyhydrocarbon-generatingpressurizationofshaleconstitutesthechanneloftheoilprimarymigration,andisalsoconducivetOhydrocarb
8、onexpulsionoftheshale.Keywords:tightoil;oilcontent;hydrocarbonexpulsioneffi