Abstract
Oilsand in China is very rich, especially in northwestern Sichuan basin. Houba oilsand is one of the famous oilsand belts, it consists of medium-coarse grained sandstone with high porosity and permeability. The genesis of those pores is very important in the research of Houba oilsand reservoir. Based on thin section analyses, SEM observation and X-ray diffraction (XRD) analysis, the diagenesis and pore evolution of oilsand reservoir have been studied. It shows oilsand reservoir in Shaximiao Formation had experienced the early diagenesis and the late diagenesis including early mechanical compaction, four times cementation and two times dissolution. Diagenetic alterations affect the pore evolution in the long geology history. At last, porosity evolution model of the oilsand reservoir have been established.
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