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时间:2020-01-13
《不同孔喉匹配关系下的特低渗透砂岩微观孔喉特征差异.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第35卷第4期石油窦鲐沾届Vo1.35,No.42013年7月PETRoLEUMGEoLoGY&EXPERIMENTJu1.,2013文章编号:1001—6112(2013)04—0401—06doi:10.11781/sysydz201304401不同孑L喉匹配关系下的特低渗透砂岩微观孑L喉特征差异高辉,敬晓锋,张兰(1.西安石油大学石油工程学院西安710065;2.玉门油田分公司鸭儿峡油田作业区甘肃酒泉735200;3.玉门油田分公司老君庙油田作业区,甘肃酒泉735200)摘要:因沉积和成岩作用改造不同,渗透率相近或相等的砂岩,微观孑L喉特征参数存在明显差异。以吴起地
2、区延长组长6砂岩和牛圈湖地区西山窑组x砂岩为对象,综合利用物性、铸体薄片和恒速压汞对不同孑L喉匹配关系下的微观孑L喉特征参数进行了定量对比。结果表明,各渗透率级别样品的孔隙参数差异不大,微观孔喉特征的差异主要体现在喉道上。发育的溶蚀孔和晶间孑L造成x2砂岩的弯片状、管束状喉道含量高,喉道半径小且分布范围窄,对渗透率贡献集中,平均喉道半径和主流喉道半径小、大孔喉比含量高。长6砂岩缩颈状、片状和弯片状喉道发育,喉道半径差异大、大喉道含量高的特征归因于发育的原生粒间孑L不同孔喉匹配关系下的特低渗透砂岩,开发过程中应区别对待。关键词:孔隙喉道类型;孔喉差异;特低渗透砂岩;延长组;
3、西山窑组;吴起地区;牛圈湖地区中图分类号:TEl22.23文献标识码:ADiferenceofmicro-porethroatcharacteristicsinextra·lowpermeabilitysandstoneofdiferentporethroatmatchingrelationshipGaoHui,JingXiaofeng,ZhangLan(1.CollegeofPetroleumEngineering,Xi’anShiyouUniversity,Xi’an,Shaanxi710065,China;2.YaerxiaOilFieldWorkingQuarte
4、r,YumenOieldCompany,Jiuquan,Gansu735200,China;3.LaojunmiaoOilFieldWorkingQuarter,YumenOieldCompany,Jiuquan,Gansu735200,China)Abstract:Therearedifferentporethroatmatchingrelationshipandmicro—porethroatcharacteristicsforsimilarorequalsandstonesbecauseofdifferentdepositionanddiagenesisrecons
5、truction.TakingtheChang6sandstoneofYanchangFormationinWuqiareaandtheX2sandstoneofXishanyaoFormationinNi~uanhuareaastheobjects,themicro-porethroatcharacteristicsindifferentporethroatmatchingrelationshipsareevaluatedquantitativelyusingphysicalpropertytesting,castsectionandconstantratemercur
6、ypenetrationtechnique.Theresultsshowthattherearenoobviousdifferencesinporeparameters,andthedifferencesofmicro—porethroatcharacteristicsaremainlypresentedinthroatparametersforsampleswithdifferentpermeabilities.AstotheX2sandstone,thegenerationofdissolutionporesandintercrystalporesleadstohig
7、hcontentofcurvedlamellarandtubebundlethroat,smallthroatradiusandnarrowdistribution,concentratedcontributionofthroattopermeability,fineaver—agethroatradiusandmainflowthroatradius,highcontentofbigporethroatratioinNiujuanhuarea.IntheChang6sandstone,necking,flakyandcurv
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