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本文通过某油田G区内大量岩心铸体薄片及物性等资料分析,对C6和C8储集层的岩石学特征、孔渗特征及孔隙类型等进行了深入研究.通过C6与C8储集层特征对比分析发现,C6与C8储层总体均表现为成分成熟度低、结构成熟度较高的特点.C6储层物性特点为中孔特低渗型,C6储层孔隙类型以残余粒间孔为主;C8储层物性特点为中—低孔特低渗型,C8储层孔隙类型也以残余粒间孔为主.沉积背景、岩石成分、填隙物成分及含量、成岩作用中的压实与压溶作用、碳酸盐胶结作用等是影响储层物性的主要因素.
In this paper, we have studied the petrological characteristics, pore-permeability characteristics and pore types of C6 and C8 reservoirs on the basis of the analysis of a large number of thin sections of core castings and physical properties in G area of a certain oilfield. The comparative analysis shows that the C6 and C8 reservoirs are generally characterized by low maturity and high structural maturity.The physical properties of the C6 reservoir are mesoporous ultra-low permeability type, the pore type of the C6 reservoir is characterized by the residual intergranular pores of Mainly, the physical properties of C8 reservoir are medium-low porosity and ultra-low permeability type, and the pore types of C8 reservoir are mainly residual intergranular pores.The sedimentary background, rock composition, interstitial composition and content, compaction in diagenesis And pressure solution, carbonate cementation, etc. are the main factors that affect reservoir physical properties.