西南石油大学学报(自然科学版)

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Contrast of Shale Gas Reservoir Conditions in China and the
United States

Guan Xiaoxu1,2, Yi Xiangyi1, Yang Huohai1,2   

  1. 1. College of Energy Resources,Chengdu University of Technology,Chengdu,Sichuan 610059,China
    2. School of Petroleum and Natural Gas Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China
  • Online:2014-10-01 Published:2014-10-01

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.

Key words: shale reservoir, brittle mineral, microfracture, organic content, brittleness index