The characteristics of shale gas reservoirs and the engineering characteristics of "factory" operation lead to repeated production performance among wells. which is the theoretical basis of a probability method to calculate estimated ultimate recovery (EUR). Compared to the conventional deterministic method. the probability method can calculate a reserve probability distribution. https://www.roneverhart.com/HP-Pavilion-15-eg2373cl-15-6-FHD-Touch-Laptop-Intel-Core-i7-1255U-3-50-GHz-GeForce-MX550-16GB-DDR4-512GB-SSD-Windows--p8309/