Abstract
This paper presents a preliminary experimental study on methane adsorption capacity in shales before and after artificial deformation. The experimental results are based on uniaxial compression and methane isothermal adsorption tests on different shale samples from the Silurian Longmaxi Formation, Daozhen County, South China. Two sets of similar cylindrical samples were drilled from the each same bulk sample, one set was subjected to a uniaxial compressive simulation test and then crushed as artificial deformed shale sample, the other set was directly crushed as the original undeformed shale sample. And then we conducted a comparative experimental study of the methane adsorption capacity of original undeformed and artificially deformed shales. The uniaxial compression simulation results show that the failure mode of all samples displayed brittle deformation. The methane isothermal adsorption results show that the organic matter content is the main controlling factor of shale methane adsorption capacity. However, the comparative results also show that the compression and deformation have an effect on methane adsorption capacity, with shale methane adsorption capacity decreasing by about 4.26–8.48% after uniaxial compression deformation for the all shale samples in this study.
Highlights
The adsorbed gas accounts for a large proportion of the total shale gas content and has a significant impact on shale gas resource potential (Ross and Bustin, 2009; Zhang et al, 2012; Wu et al, 2014; Vishal et al, 2019)
In this paper we present an experimental study of uniaxial compression induced brittle deformation and its influence on the methane adsorption capacity of shale
We present an experimental study of uniaxial compression induced brittle deformation and its influence on methane adsorption capacity of shale
Summary
The adsorbed gas accounts for a large proportion of the total shale gas content and has a significant impact on shale gas resource potential (Ross and Bustin, 2009; Zhang et al, 2012; Wu et al, 2014; Vishal et al, 2019). The CH4 adsorption capacity in shale samples has been widely recognized as varying significantly depending upon the composition (organic matter and clay mineral type and amount) of the shales, as well as the physical porosity and pore properties (Hill et al, 2007; Javadpour et al, 2007; Ross and Bustin, 2007, 2008, 2009; Chalmers and Bustin, 2008a,b; Jenkins and Boyer, 2008; Zhang et al, 2012; Hou et al, 2014; Tan et al, 2014; He et al, 2019; Tang et al, 2019; Jiang et al, 2020). An understanding of the relationships between organic matter (type, maturity and content), clay mineral (type and content), porosity (microporous structural framework) and methane sorption capacity in shale is crucial for assessing the shale reservoir
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