碳酸盐岩中的一种储集空间—微孔隙

塔里木盆地北部沙14井的下奥陶统低能碳酸盐岩中喷出高产油气流,其主要储集空间为微孔隙。这是我国首次发现的以微孔隙为主要储集空间的碳酸盐岩储层。微孔隙的特征如何?在成岩过程中是如何演化的?其成因和控制因素是什么?本文根据国内外最新资料,简要回答了这些问题。

A RESERVOIR TYPE IN CARBONATE ROCKS—MICROPOROSITY

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.