Description of the material: The proper estimation of the Actual Stimulated Reservoir Volume (ASRV) requires the modeling of the propagation of multiple hydraulic fractures and their interaction with the natural fractures which will determine the complex geometry of connected fracture network . This paper describes a new numerical modeling approach called the Material Point Method (MPM) that overcomes the limitation of the Extended Finite Element Method (XFEM) commonly used to model the propagation of one single hydraulic fracture. Since MPM is a meshless method, it provides multiple unique advantages including the ability to simulate the propagation of multiple hydraulic fractures while accounting for their interaction with the natural fractures. In this work, the 3D distribution of the natural fractures system is derived from an accurate description that relies on the integrated use of seismic and well data. Application: An actual frac job is simulated around a horizontal wellbore where the surrounding reservoir rock has heterogeneous elastic properties derived from a pre-stack elastic inversion. The complex 3D natural fractures are shown to play a major role in the resulting complex network. The derived results are used to evaluate the effects of the resulting complex fracture network geometry on proppant placement. Results, Observations, and Conclusions: These new concepts are illustrated with an actual fracing example where microseismic events validated the results. Significance of subject matter: A meshless numerical modeling method is applied to the realistic simulation of hydraulic fracture propagation in an actual reservoir with microseismic validation.
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