摘要:
通过普通薄片、铸体薄片观察和扫描电镜研究,并结合X射线衍射与压汞分析等资料,对鄂尔多斯盆地富县地区延长组长6段、长8段的储层物性特征及影响因素进行了研究。研究发现,延长组长6段、长8段储层岩石类型主要为岩屑长石砂岩,其次为长石岩屑砂岩。储层颗粒分选中等-较好,磨圆度为次棱角状-次圆状,其中以次圆状居多,接触式胶结。孔隙类型主要有残余粒间孔隙、填隙物内微孔隙、粒间溶孔、粒内溶孔、微裂隙等。总体上富县地区延长组储层由于受岩性、成岩等作用影响表现出低孔低渗的特征。
Abstract:
In the light of thin section examination,SEM,X-ray diffraction analysis and mercury injection analysis, the porosity and permeability and their controlling factors are explored for the hydrocarbon reservoirs in the Chang-6 and Chang-8 members of the Yanchang Formation in the Fuxian region,Ordos Basin. The hydrocarbon reservoirs in the Chang-6 and Chang-8 members of the Yanchang Formation consist dominantly of lithic feldspar sandstone and subordinately of feldspathic litharenite,which are moderately to well sorted,subangular to subrounded,and in contact cementation. The porosity types include residual intergranular pores,interstitial micropores,intergranular solution openings,intragranular solution openings and microfissures. Influenced by lithology and diagenesis,the hydrocarbon reservoirs in the Fuxian region are assigned to the low-porosity and low-permeability hydrocarbon reservoirs.
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