Abstract:

Microporosity in carbonate rocks is not only a kind of reservoir space,but also a main reservoir type for some reservoirs in certain geological condition.Therefore,it is an important reservoir type,especially for the carbonate rocks deposited in low energy envi-ronment.This is evidenced by many microporosity reservoirs of Mesozoic and Tertiary in Middle East,North Africa,Southeast Asia and North America,and it is also evidenced by the microporosity reservoir of Lower Ordovician limestones in Sha-14 Well,North Tarim Basin.The type,evolution in diagenetic process,origin and control factors of mi-croporosity were discussed in this paper,and the characteristics of microporosity reservoir in Lower Ordovician limestone in Sha-14 Well were also described.