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鄂尔多斯盆地北部内蒙古自治区鄂多克旗一乌审旗一带，长庆油田公司的天然气勘探取得了重大突破，发现了苏里格气田，含气面积约6000km2。圈闭类型为岩性圈闭气藏，下石盒子组为主要目的层，储集岩为一套中、粗拉砂岩，储集空间以各类次生孔隙为主。成岩作用对储层的影响有利有弊，压实与胶结作用使原生孔隙几乎丧失贻尽，溶蚀作用所形成的次生孔隙改善了砂岩储层的孔渗性。砂岩储集层埋深在2850一3100m时，最有利于次生孔隙的形成。成功地预测次生孔隙发育区，将是寻找高产富集区的关键。

Diageneses and Pore Evolution of P1h8 Reservoir in Sulige Gas Field

??An important breakthrough in natural gas exploration at Eduoke Banner-Wushen Banner in the Inner Mongol Autonomous Region in North E'erduosi Basin has been made by Changqing Oil Field Branch,PCL,Sulige gas field with a gas-bearing area of 6 000 km² being found.Gas reservoir belongs in lithologic trap,Lower Shihezi Formation is the major target zone,the reservoir rocks are composed of a series of medium-coarse sandstones and storages rooms are mainly the secondary pores with various types.The influence of diageneses on reservoir has both advantages and disadvantages,the compaction and cementation making the primary pores be almost lost but the secondary pores formed by corrosion being able to improve the porosity and permeability of sandstone reservoir.It is concluded that when the burial depths of sandstone reservoirs are 2 850??3 100 m,the growth of secondary pores is mostly beneficial,thus predicting successfully the growth areas of secondary pores which is the key of prospecting for gas accumulation regions.