Engineering simulation method of effective fracturing volume based on discrete fracture network geological model

The accuracy of fracturing volume directly restricts the accuracy of productivity prediction and affects the development of unconventional reservoirs.Therefore, the high-precision effective fracturing volume must be predicted.Currently, the engineering fracturing volume is primarily calculated based on microseismic monitoring event points, which are significantly affected by human subjective factors.The volume error is one or several orders of magnitude, and the productivity prediction accuracy is low.Hence, an unstructured tetrahedron network is used to characterize the effective microseismic event points using the fracture tree model, and a discrete fracture network is established.Subsequently, a rapid numerical simulation of the depletion development of fractured wells is performed to obtain the pressure distribution in the entire field, generally known as the funnel-type distribution.Based on the edge of the pressure funnel, the critical pressure PC of the transformation area is determined, followed by tetrahedral grids with a pressure lower than the above-mentioned critical value.The volumes of these grids are summed to obtain the effective fracture volume.The practical application results of three fractured wells on a platform are analyzed.The production capacity predicted based on the economic limit of the fracturing volume is consistent with the actual production data of a single well, proving that the method can yield the effective fracturing volume with high accuracy.