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.