Introduction:
Organic matter is primarily defined as organic compounds that are directly or indirectly derived from cells or tissues of living organisms. In the case of shale rocks, these are mostly phytoplankton organisms, while in the case of other energy resources, such as coal, organic matter is composed predominantly of terrigenous material derived from trees, shrubs, ferns or leaves. Organic matter plays a key role in the gas adsorption in CSG and shales.
In general, for small pores, the sorptive storage exceeds the compressed gas storage [Bustin et al, 2008]. Scanning electron microscope of images namometer pores are shown below:
References:
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Freeman, C. M. Study of Multi-Scale Transport Phenomena in Tight Gas and Shale Gas Reservoir Systems. PhD. Thesis, Texas A&M University, 2013.