摘要
Abstract
The exploitation of shale gas has been greatly successful in North America,while it is just starting out in China. Comparing the conditions of shale gas formation in China with those in America,it is of great significance to better exploit shale gas. This paper compared and analyzed 3 aspects in detail:the conditions for accumulation of shale gas,the properties of reservoir and reservoir evaluation factors. Through comparison,we get the following conclusions. The conditions for accumulation of shale gas in China are more complex,because the reservoir has properties great depth,high temperature, high thermal maturity and thin thickness. The mineral composition of shale gas in China is more complicated. The main clay minerals are andreattite and illite,both of which are fine grain migrating minerals. On the other hand,the shale contains more quartz,which leads to a higher brittleness index. Therefore,the fracture operation can be well applied,reservoir evaluation factors are also more complex in China. In order to evaluate the shale gas formation,it is necessary to take organic charcoal content,organic maturation,kerogen type,net pay thickness and lithological feature into consideration. In all,from the aspect of reservoir conditions,the shale gas reservoir in China,especially in Sichuan Basin,has already been equipped with the large scale exploitation conditions.关键词
页岩储层/脆性矿物/微裂缝/有机质含量/脆性指数Key words
shale reservoir/brittle mineral/microfracture/organic content/brittleness index分类
能源科技
