Optimization of Development Parameters for Tight Gas Reservoirs in Area S

Abstract

The tight sandstone gas reservoirs in Area S are characterized by deep burial, strong heterogeneity, and poor petrophysical properties. Single-well productivity varies widely and declines rapidly; therefore, establishing optimal combinations of development parameters is essential for improving development efficiency. Taking the tight gas reservoir in Area S as the study object, this work integrates well logging, geological, and production dynamic data. A three-dimensional fine-scale geological model was constructed using sequential indicator simulation and sequential Gaussian simulation, and geological reserves were quantitatively evaluated using the Monte Carlo method (P50 = 4.818 × 109 m3). Based on this model, numerical simulation techniques were applied to conduct sensitivity analysis and optimization of key development parameters. The results indicate that for vertical wells in Area S, a reasonable fracture half-length ranges from 100 to 300 m with 3-4 fracturing stages; for horizontal wells, a reasonable lateral length ranges from 800 to 1000 m with a fracture half-length of approximately 100 m. For zones classified by reserve abundance, differentiated well-pattern layouts are proposed: a 900 m × 1200 m pattern for Class I zones, a 700 m × 1000 m pattern for Class II zones, and a 500 m × 700 m pattern for Class III zones. These findings provide a scientific basis and technical support for the efficient development of Area S and other similar tight gas reservoirs.