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1、第26卷第2期巖性油氣藏Vo1.26No.22014年4月LITHOLOGICRESERV0IRSADr.2014文章編號(hào):1673—8926(2014)02—0015—06鄂爾多斯盆地鎮(zhèn)原地區(qū)長(zhǎng)8油層組超低滲儲(chǔ)層孑L隙結(jié)構(gòu)特征胡作維,李云,王海紅,侯長(zhǎng)冰,王昌勇,劉犟(1.油氣藏地質(zhì)及開發(fā)工程國(guó)家重點(diǎn)實(shí)驗(yàn)室(成都理工大學(xué)),成都610059;2.中國(guó)石油長(zhǎng)慶油田分公司超低滲透油藏第四項(xiàng)目部,甘肅慶陽745100)摘要:孔隙結(jié)構(gòu)特征作為油氣勘探與開發(fā)中必不可少的重要基礎(chǔ)資料,日益成為油氣儲(chǔ)層綜合評(píng)價(jià)和油氣藏精細(xì)描述中不可或缺
2、的組成部分。根據(jù)巖石薄片、常規(guī)物性及高壓壓汞等分析結(jié)果,系統(tǒng)地研究了鄂爾多斯盆地鎮(zhèn)原地區(qū)長(zhǎng)8油層組超低滲儲(chǔ)層的孔隙結(jié)構(gòu)特征。并對(duì)其進(jìn)行了分類評(píng)價(jià)。結(jié)果表明:鎮(zhèn)原地區(qū)長(zhǎng)8油層組巖石類型主要為富含長(zhǎng)石和巖屑砂巖,總體屬于低孔、超低滲儲(chǔ)層,其喉道半徑較小,產(chǎn)油能力較低,驅(qū)油效率不高,喉道分布的集中程度和均勻程度較差,粗細(xì)喉道分異性較強(qiáng);砂巖孔隙結(jié)構(gòu)可分為好、較好、中等、較差和差5類,其中中等和較差孔隙結(jié)構(gòu)是鎮(zhèn)原地區(qū)長(zhǎng)8油層組中最為典型的孔隙結(jié)構(gòu)類型關(guān)鍵詞:砂巖儲(chǔ)層;超低滲儲(chǔ)層;孔隙結(jié)構(gòu);長(zhǎng)8油層組;鄂爾多斯盆地中圖分類號(hào):TEl2
3、2.23文獻(xiàn)標(biāo)志碼:APorestructurecharacteristicsofultra—lowpermeabilityreservoirsofChang8oilreservoirsetinZhenyuanarea,OrdosBasinHUZuowei,LIYun,WANGHaihong,HOUChangbing,WANGChangyong,LIUJiang(1.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityof
4、Technology,Chengdu610059,China;2.TheFourthSectionofUltra—lowPermeabilityReservoirs,PetroChinaChangqingOilfieldCompany,Qingyang745100,Gansu,China)Abstract:Asimportantbasicdataforpetroleumexplorationanddevelopment,thecharacteristicsofporestructureincreasinglybecamean
5、indispensablepartinthecomprehensiveevaluationandfinedescriptionoftheoilandgasreservoirs.Basedontheanalysisofthinsections,routinephysicalpropertiesandhigh—pressuremercuryinjection,thispapersystematicallystudiedthecharacteristicsandcomprehensiveclassificationofthepor
6、estructureoftheultra-lowpermeabilityreservoirsofChang8oilreservoirsetinZhenyuanarea,OrdosBasin.Theresultsshowthatthereservoirsandstonesarecharacterizedbyfeldsparandlithic-richsandstonetypes,low-porosityandultra—lowpermeability,micro—finesizesofpore—throatradius,low
7、capacityofoilproduction,nothigheficiencyofoildisplacement,poorconcentrationanduniformityofpore-throatsizes,andstrongdifferentiationbetweencoarse-throatsandfine·throats.Theporestructureofreservoirsandstonescanbedividedintofivetypes:good,slightlygood,moderate,slightl
8、ypoorandpoortypes.Themoderateandslightlypoortypesarethemosttypicaltypesoftheporestructure.Keywords:sandstonereservoir;ultra-lowpermeabilityreserv