Characteristics of paleo-fluid of coal-bearing strata and its influence on the properties of CBM reservoirs in the Western Guizhou Province, China

ABSTRACT

The differential characteristics of paleo-fluids and their influence on the properties of coal reservoirs in Panxian and Zhijin areas were investigated by use of the data from experiments and drill wells. The results show that two generations of fluid activity related to hydrocarbon generation can be identified in these areas. The type of paleo-formation water indicates that the coal-bearing formation in Zhjin area is more favorable for hydrocarbon preservation than that of Panxian area. Under the influence of the paleo-fluid, the coal reservoirs in Zhijin area have poor pores connectivity, which are unfavorable to the output of coalbed methane.

KEYWORDS:

• Coalbed methane
• fluid inclusion
• paleo-fluids
• reservoirs
• Western Guizhou Province

Additional information

Funding

This work was financially supported by the National Natural Science Foundation of China (40730422, 41272175), the Key Project of the National Science & Technology (2011ZX05034), and the Fundamental Research Funds for the Central Universities (2011YXL052).