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《致密砂巖儲層微觀孔隙結(jié)構(gòu)特征——以鄂爾多斯盆地延長組長7儲層為例.pdf》由會員上傳分享,免費在線閱讀,更多相關內(nèi)容在行業(yè)資料-天天文庫。
1、第25卷第4期巖性油氣藏V01.25No.42013年8月LITH0L0GICRESERV0IRSAUg.2013文章編號:1673—8926(2013)04—0023—04致密砂巖儲層微觀孔隙結(jié)構(gòu)特征——以鄂爾多斯盆地延長組長7儲層為例何濤,王芳一,汪伶俐2,3(1.中國石油長慶油田分公司蘇里格南作業(yè)分公司,陜西西安710018:2.中國石油長慶油田分公司勘探開發(fā)研究院,陜西西安710018;3.低滲透油氣田勘探開發(fā)國家工程實驗室,陜西西安710018)摘要:運用物性分析、掃描電鏡、鑄體薄片及恒速壓汞等技術,對致密
2、砂巖儲層進行了微觀孔隙結(jié)構(gòu)定量分析。研究結(jié)果表明:鄂爾多斯盆地長7油層組為典型的致密砂巖儲層,滲透率小于0.3mD.孔隙類型以次生溶孔為主,平均孔隙半徑為l62Ixm,與滲透率無相關性;平均喉道半徑為0.33m,與滲透率具有很好的正相關性,是影響滲透率的主要因素;孔喉半徑比大,平均為602,大孔隙被小喉道所控制,從而造成儲層非均質(zhì)性強、滲流能力差。致密砂巖儲層的規(guī)模開發(fā)需采用先進的儲層改造工藝.充分擴大喉道半徑,降低孔喉比,提高儲層滲流能力,這樣才能取得更好的開發(fā)效果關鍵詞:致密砂巖;微觀孔隙結(jié)構(gòu):恒速壓汞:鄂爾多斯
3、盆地中圖分類號:TEl22.221文獻標志碼:ACharacteristicsofmicro—porestructureoftightsandstonereservoir:AcasestudyfromChang7reservoirofYanchangFormationinOrdosBasinHETao,WANGFang一,WANGLingli'(1.SouthSuligeOperationCompany,PetroChinaChangqingOilfieldCompany,Xi’an710018,China;2.Re
4、searchInstituteofExplorationandDevelopment,PetroChinaChangqingOilfieldCompany,Xi’an710018,China;3.NationalEngineeringLaboratm3~forExplorationandDevelopmentofLow—permeabilityOilandGasField,Xi’an710018,China)Abstract:Basedonreservoirproperties,scanningelectronicm
5、icroscope,castthinsectionandconstantratemercurypenetration,thispapercamedoutquantitativeanalysisofmicro—porestructureoftightsandstonereservoir.TheresultshowsthatChang7reservoirinOrdosBasinistypicaltightsandstonereservoir,thereservoirpermeabilityislessthan0.3mD,
6、thesecondarydissolvedporeisthemainporetypeandaverageporeradiusis162m,andthereis130correlationwithpermeability;theaveragethroatradiusis0.33p,mandhasagoodpositivecorrelationwithpermeability.a(chǎn)nditisthemaininfluencingfactorofpermeability;theporethroatradiusratioisl
7、argeandtheaveragevalueis602;thebigporeiscontrolledbysmallthroat,whichcausesreservoirstrongheterogeneityandpoorpermeability.So,theadvancedstimulationtechnologyneedtobeusedforlargescaledevelopmentoftightsandstonereservoir,andneedtoenlargethethroatradiusandlowerpo
8、rethroatradiusratioandimprovethepermeability.Keywords:tightsandstone;micro-porestructure;constantratemercurypenetration;OrdosBasin收稿日期:2013—03—20;修回日期:2013—05—20作者簡介:何濤(1979