Study on main controlling factors of tight gas reservoir productivity

Abstract In this paper, a differential discrete numerical model is first established, taking into account the pore structure characteristics of tight reservoirs. Subsequently, a research framework for the rock compression coefficient is developed, and its influence on multi‐stage flow in tight reservoirs is investigated. Following this, the main geological controlling factors affecting productivity are analyzed. With porosity and permeability as the focus, a productivity analysis program for tight reservoirs is constructed, revealing the evolution patterns of production capacity under low‐porosity and low‐permeability conditions. The main findings are as follows: (a) In tight reservoir settings, different rock compression coefficients have a relatively limited impact on daily gas production. (b) Initial daily gas production shows little variation across different porosity values; however, as depletion development proceeds, lower porosity leads to a more rapid decline in gas production. (c) At permeability values of 0.03, 0.05, 0.07, and 0.1 mD, the initial daily gas production rates are 1528.578, 2547.596, 3566.587, and 5095.023 m 3 , respectively. Daily gas production gradually decreases throughout the depletion process.