Reconsideration of the Adsorption/Desorption Characteristics with the Influences of Water in Unconventional Gas Systems

Table 1

Characteristics of water in shale and coalbed during reservoir forming process.

Sample	Characterization parameters
Coalbed	Coalification process	Participants	Production	Evaluation method
	Biochemical coalification	Organic matter, bacteria and fungi, swamp water, oxygen	H2O, CH4, CO2, and N2	Qualitative
	Geochemical coalification	Surface water, remains of plant and animal	Coal
	Rank	Participants	Production	Evaluation method
	Lignite and bituminous	Plant (1 unit)	H2O (64 units), CH4 (8 units), and CO2 (2 units)	Quantitative
	Semianthracite	Bituminous (1 unit)	H2O (7.87 units), CH4 (9.23 units), and CO2 (3 units)
	Anthracite	Semianthracite (1 unit)	H2O (1 unit) and CH4 (36 units)
	Rank	Participants	Production	Evaluation method
Shale	Pyrolysis	Bituminous (1 unit)	H2O (7.87 units), CH4 (9.23 units), and CO2 (3 units)	Qualitative
	Thermal cracking	Semianthracite (1 unit)	H2O (1 unit) and CH4 (36 units)