The Effect of Hydraulic-Natural Fracture Networks on the Waterflooding Development in a Multilayer Tight Reservoir: Case Study

An integrated hydraulic fracturing followed by waterflooding was conducted in a heterogeneous sandstone formation the Northern Shanxi Slop of Ordos Basin Western China. Water breakthrough quickly occurred, and underlying mechanism water has not been well understood. Such needs to be investigated comprehensively from spatial connectivity multilayer sand bodies characterization hydraulic-natural fracture networks. Here, an approach is proposed tap remaining oil individual layer during late-stage development tight reservoirs. A case study utilized demonstrate applicability method. It found that six layers could further divided within target layers. These have variety physical mechanical properties, leading asymmetric distribution fractures after performing whole The difference conforms features multiperiod superimposed channel sedimentary environment fan delta front. natural were generated tectonic movement Mesozoic period with dominant orientation approximately NE 67°. propagated connected preexisting fractures, forming intricate natural-hydraulic pattern each primarily ascribed networks microfacies. refracturing operations based on are proven effective developing formation. average production related wells increased 0.61 t/d 2.18 t/d. This practical strategy provides insights for likewise