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时间:2020-06-03
《低渗透砂岩储层孔隙结构对储层质量的影响——以鄂尔多斯盆地姬塬地区长8油层组为例.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第26卷第5期岩性油气藏V01.26No.52014年10月LITHOLOGICRESERVOIRSOct.2014文章编号:1673—8926(2014)05—0069—06低渗透砂岩储层孔隙结构对储层质量的影响以鄂尔多斯盆地姬塬地区长8油层组为例蔡碉,一,熊琦,李勇,一,丁迎超,徐文杰(1.长安大学地球科学与资源学院,西安710054;2.长安大学成矿作用及其动力学实验室,西安710054)摘要:应用常规压汞、铸体薄片、扫描电镜和岩石薄片等资料,结合恒速压汞实验,综合研究了鄂尔多斯盆地姬塬地区长8低渗透砂岩储层微观孔隙结构特征及
2、其对储层质量的影响。结果表明,长8储层孔隙类型多样.孔隙结构可划分为4种类型:I类低排驱压力一中喉型、Ⅱ类较低排驱压力一细喉型、Ⅲ类中排驱压力一微细喉型和Ⅳ类高排驱压力一微喉型。储层物性与平均孔喉半径、中值孔喉半径、分选系数及最大进汞饱和度均具有正相关性,与结构系数均具有负相关性,而与均值系数、歪度及退汞效率均无明显相关性恒速压汞测试进一步表明.储层物性与孔隙参数相关性不明显.储层质量主要受喉道的控制。在低渗透储层开发过程中应注重对喉道的有效保护,进而取得更好的开发效果。关键词:低渗透砂岩;孔隙结构特征;储层质量;姬塬地区;鄂尔多斯
3、盆地中图分类号:TEl12.23文献标志码:AInfluenceofporestructureonreservoirqualityoflowpermeabilitysandstonereservoir:AcasestudyfromChang8OilreservoirsetinJiyuanarea,OrdosBasinCAIYue一,XIONGQi,LIYong一,DINGYingchao,XUWenjie(1.SchoolofEarthScienceandResources,Chang’anUniversity,Xi’an71005
4、4,China;2.LaboratoryofMineralizationandDynamics,Chang’anUniversity,Xi’an710054,China)Abstract:Basedonconventionalconstant—pressuremercuryinjection,castimage,scanningelectronmicroscopyandsliceobservation,combinedwithconstant—speedmercuryinjection,thispaperstudiedthemicr
5、oscopicporestructureanditsinfluenceonreservoirqualityofChang8lowpermeabilitysandstonereservoirsinJiyuanarea.TheresultshowsthatChang8reservoirsdevelopedvariousporetypesandtheporestructurecanbedividedintofourcategories.Theaveragepore-throatradius,medianpore-throatradius,
6、sortingcoeficientandmaximummercurysaturationhaveapositivecorrelationwithreservoirproperties,haveanegativecorrelationwithstructurecoeficient,andhavelittlecorelationwithaveragecoeficient,skewnessandmercurywithdrawaleficiency.Constant—speedmercuryinjectiontestfurthershows
7、thatphysicalpropertiesofChang8lowpermeabilityreservoirhavelittlecorelationwithporeparameters,andreservoirqualityaremainlycontrolledbythroat.Intheprocessoflowpermeabilityreservoirdevelopment,weshouldprotectthethroateffectivelytoachievebetterdevelopmenteffect.Keywords:lo
8、wpermeabilitysandstone;porestructurefeatures;reservoirquality;Jiyuanarea;OrdosBasin收稿日期:2014—04—26;修回13期:2014~06—12基金
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