System and Method for Simulation of Gas Desorption in a Reservoir Using a Multi-Porosity Approach

A computer program product comprising non-transitory computer-readable medium having stored thereon instructions executable by a computer for causing the computer perform simulation of a reservoir represented by a model having a plurality of porosity nodes, the instructions for causing the computer to:

• characterizing at least three different porosity types for the modeled reservoir, the at least three different porosity types selected from the group consisting of natural fracture pore systems, matrix pore systems, induced fracture pore systems and vug pore systems;
• identifying transfer terms between the nodes of at least three porosity types;
• and
• solving a linear system for the model using a linear solver.

A method for drilling one or more wellbores in shale reservoir, which method comprises:

• modeling an oil and gas shale reservoir having natural fracture pore systems, matrix pore systems, induced fracture pore systems and vug pore systems;
• characterizing at least three different porosity types in the modeled reservoir, wherein the characterized pore types are utilized to create one or more subgrids that represent a zone within the reservoir, and wherein the zone includes at least one node of each porosity type;
• assigning transfer terms between the at least three porosity types, wherein transfer terms between nodes are assigned on a nodal basis to the nodes of the subgrids;
• and
• solving a linear system for the model using a linear solver;
• preparing equipment to construct a portion of said wellbore;
• based on the modeled reservoir, selecting a characteristic for the wellbore;
• and
• drilling a wellbore in accordance with the selected characteristic.