MODELING METHOD FOR GAS PRODUCTION OF CBM RESERVOIR ROCKS

摘要

The present invention relates to a method for modeling the gas production of a coal bed methane gas reservoir. (A) forming a three-dimensional grid having a plurality of cells by partitioning a reservoir in a coal bed methane (CBM) development area into a three-dimensional grid, (b) forming at least one borehole in the development area, Acquiring a core sample for each depth; (c) modeling the ash, water content and gas content of the plurality of cells in the three-dimensional grid; (d) modeling the pressure change with time of each cell in the grid as the production cell is formed in the grid; And (e) performing a Langmuir experiment on the core sample obtained in step (b), wherein the Langmuir correction volume constant and the correction pressure constant for the case where only coal is present except for ash and moisture in the core sample The Langmeyer function is determined for the maximum gas adsorption amount using the pressure, the amount of reaction, and the water content as parameters, and the Langmayer function is applied to each cell on the grid, and the amount of gas desorbed Is calculated.