Received date: 2015-04-28
Revised date: 2015-05-22
Online published: 2015-09-10
The evaluation of shale gas content has a great significance on resource prediction,reserve calculation,and exploration and development planning.Desorption method is one of the methods which is widely applied to the evaluation of shale gas content.The present shale gas desorption method has mainly followed coalbed methane technologies.After the core or cutting shale sample is sealed in the desorption canister,desorbed gas and residual gas are measured,and the lost gas is fitted using the measured data.Their sum is the total gas content.After years of development,desorption apparatuses as well as data analytical methods have been improved continuously.USBM method,polynomial method,Smith-Williams method,decline curve method and Amoco method have been successively developed to analyze desorption process.In actual applications,temperature and other environmental factors,lost time,fitting method and desorption apparatuses will influence the result of desorption.Due to the differences in diffusion mechanism and desorption process between shale gas and coalbed methane,evaluation of shale gas content based on methods from coalbed methane may lead to a significant error.Future research will target to improve desorption apparatuses,develop shale gas desorption models,standardize desorption methods as well as set up a relevant industry standard.
Key words: Shale; Gas content; Desorption apparatuses; Desorption methods
WEI Qiang,YAN Bo,XIAO Xian-ming . Research Progress on the Desorption Methods of Shale Gas[J]. Natural Gas Geoscience, 2015 , 26(9) : 1657 -1665 . DOI: 10.11764/j.issn.1672-1926.2015.09.1657
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