鄂尔多斯盆地苏里格气田成藏机理研究

RESERVOIRING MECHANISM OF SULIGE GAS FIELD IN E’ERDUOSI BASIN

苏里格气田是目前我国探明天然气地质储量最大的气田,也是我国在克拉通盆地找到的最大的天然气田。苏里格气田的形成与成藏条件的分析研究,对我国克拉通盆地的天然气藏形成与富集规律认识有借鉴意义。文章通过对苏里格气田生、储、盖匹配条件的分析,以及对苏里格气田的生、排烃特征、运、储体系特征、天然气运聚特征及圈闭条件等成藏地质特征进行了综合分析研究,认为“广覆式”烃源岩生烃、低孔渗河流相储集砂体储气、源—储压力差较小等因素综合作用造就了现今的苏里格大气田,类似苏里格这样类型的气田,可以在塔里木盆地的塔东地区,四川盆地的川中—川南过渡带找到。

Sulige gas field was found in a craton basin in China, which is of great importance to understanding the law of reservoir formation and hydrocarbon accumulation in the similar basins in China through analyzing its reservoiring conditions. On the basis of comprehensively analyzing and studying the reservoiring geological conditions of Sulige gas field, such as the characteristics of the generation, expelling, migration and accumulation of hydrocarbons, and the trap feature, it was considered that this field resulted from the combined action of these factors as the hydrocarbon generation of 'wide-covered' source rocks, the low-porosity and low-permeability sandbody gas reservoir of fluvial facies, and the small pressure difference between source rocks and reservoir rocks, etc.; and the fields similar to Sulige gas field may be found out in the East Talimu Basin and at the Central Sichuan - South Sichuan, transitional zone in Sichuan Basin.