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时间:2020-06-05
《致密砂岩储层微观孔隙结构特征——以鄂尔多斯盆地延长组长7储层为例.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第25卷第4期岩性油气藏V01.25No.42013年8月LITH0L0GICRESERV0IRSAUg.2013文章编号:1673—8926(2013)04—0023—04致密砂岩储层微观孔隙结构特征——以鄂尔多斯盆地延长组长7储层为例何涛,王芳一,汪伶俐2,3(1.中国石油长庆油田分公司苏里格南作业分公司,陕西西安710018:2.中国石油长庆油田分公司勘探开发研究院,陕西西安710018;3.低渗透油气田勘探开发国家工程实验室,陕西西安710018)摘要:运用物性分析、扫描电镜、铸体薄片及恒速压汞等技术,对致密
2、砂岩储层进行了微观孔隙结构定量分析。研究结果表明:鄂尔多斯盆地长7油层组为典型的致密砂岩储层,渗透率小于0.3mD.孔隙类型以次生溶孔为主,平均孔隙半径为l62Ixm,与渗透率无相关性;平均喉道半径为0.33m,与渗透率具有很好的正相关性,是影响渗透率的主要因素;孔喉半径比大,平均为602,大孔隙被小喉道所控制,从而造成储层非均质性强、渗流能力差。致密砂岩储层的规模开发需采用先进的储层改造工艺.充分扩大喉道半径,降低孔喉比,提高储层渗流能力,这样才能取得更好的开发效果关键词:致密砂岩;微观孔隙结构:恒速压汞:鄂尔多斯
3、盆地中图分类号:TEl22.221文献标志码: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.anditisthemaininfluencingfactorofpermeability;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作者简介:何涛(1979
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