鄂尔多斯盆地合水地区长4+5储层特征与低渗成因探讨

应用铸体薄片、扫描电镜、粒度分析、压汞等分析化验资料,对鄂尔多斯盆地合水地区长4+5储层的储层特征和低渗成因进行了分析.结果表明,本区岩石类型以岩屑质长石砂岩为主,成分成熟度与结构成熟度均较低;储层孔隙类型以残余粒间孔为主,其次为粒内溶孔和粒间溶孔;喉道类型以片状、弯片状喉道为主,喉道属微细喉道,分选与连通性较差;造成...

Discussion on Chang 4+5 reservoir characteristics and low permeability origin in Ordos basin Heshui area

Based on chemical data analysis, such as cast ing thin slice, scanning electron microscope, sizing test,pressure mercury, we studied Chang 4+5 reservoirs charac teristics and low permeability origin in Ordos basin Heshuiarea. The result indicated that the regional rock type is nature arkosic sandstone primarily, the ingredient maturity andthe structure maturity is low; The reservoir porosity typetake the remaining intergranular hole primarily, next as agrain in dissolution pore and the intergranular dissolutionpore; The throat type is the laminated shape, the curved lamellar throat primarily, the throat is the tiny throat, theseparation and the connectivity is bad; primary origin of lowpermeability is sedimentary and diagenesis function.