Abstract:

Micro-pore filling is an adsorption behavior that usually happens in micropores and high equilibrium pressure conditions,
the thermodynamic theory based on this theory played a great role in determining the microscopic structures and adsorption
properties. In this paper, we mainly discuss the relationship of filling rate θ, character energy E, character coefficience n, differential

adsorption work A, the adsorption heat Q, the adsorption enthalpy ΔH and the adsorption entropy ΔS for methan. The results show
that 1) n=1 is appropriate; 2) the value of E decreases with raising temperatures; 3) E is among 4.14~5.63 kJ/mol; with the increase
of θ value, Q, ΔH, and ΔS decrease. These parameters change continuously and do not show sudden change. To some extent, the
thermodynamic parameters can represent the comprehensive effects of parameters such as TOC and Ro. Comparison of the calculated
parameters in this paper with the adsorption energy value of the Longmaxi shale in Sichuan basin shows that this set of shale in
China has huge exploration and development potential.

Key words: Micro-pores, fill, shale, methane, adsorption, the adsorption heat, adsorption entropy