Abstract: The invention provides techniques that relate to horizontal well completions that facilitate multistage fracturing, for example, in shale gas reservoirs. Aspects of these techniques involve the creation of large scale fracture networks, connecting the reservoir and the wellbore, facilitated by activating pre-existing natural fractures (NFs). Taking into account selected shale formation geo-mechanical characteristics facilitates the optimization of maximum stimulated reservoir volumes (SRVs). In particular, completion optimization patterns are provided for horizontal wellbores, designated herein as altered alternate fracturing (AAF) completions. Aspects of this approach involve a multi-step combination of simultaneous and alternate fracturing patterns. To illustrate aspects of optimization, the dynamic evolution and progression of NF growth are modeled using a variety of alternative criteria. In addition, specific analyses are provided of how the well completion pattern influences the fracture network.