The Evolution Model and Controlling Factors Analysis of the Pore Space of Oolitic Shoal Reservoir

摘要

The pore space type of oolitic shoal reservoir is very complicated in Feixianguan Formation in Northeast Sichuan China. And the evolution mode of different dissimilar pore space is different. An intensive research on the characteristics, the evolution mode and the controlling factors of all kinds of pore space was carried out in Feixianguan Formation in Northeast Sichuan basin. The result of study indicated that the pore types include residual intergranular pore, dissolved pores between grains, dissolved pores in grains, intracrystalline pore, intercrystal-line solution pores and fracture. The evolution mode of pore space is divided into three types (oolitic limestone shoal type, oolitic dolomite shoal type and the type without facies controlled). The formation of pore space is controlled by sedimentation, diagenesis and tectogenesis.