During the evolution of technology to successfully produce shale reservoirs, a term called Stimulated Reservoir Volume (SRV) was introduced. Since then, several authors made efforts to identify, characterize or optimize the stimulated reservoir volume. However, as current literature holds, only a few attempts have been made to summarize and analyze all these contributions. The purpose of this work is to discuss SRV, its different concepts and calculation methodologies to diminish the uncertainty and improve the understanding on unconventional hydrocarbon production.
Several techniques are discussed from literature that calculates different volumes, their names and their time-frame scope of analysis that can go from microseismic observation to stimulation to rate transient analysis to numerical simulation. Differentiation between stimulated volume and producing area is also discussed. A discussion over created fractures and the inherited debate over fracture height and brittleness are investigated. Finally, it is reviewed the changes during and after refracturing of maximum horizontal stress, permeability, conductivity and fracture dimensions and it is impact in SRV.
Based data from several hydraulic fractured wells, our observations suggest an effective improvement in the prediction of permeability distribution if more than one SRV concept is applied analyzed at different time intervals. Also results reflects the fact that micro seismic aids SRV characterization as an effective tool. Another observation for improved production is the importance of mobility for shale gas and shale oil that requires creating fracture complexity for the former to be more productive and planar fracture for the latter.
This work delivers a synopsis of several standpoints about Stimulated Reservoir Volume towards a better identification of optimum lateral length location, orientation and proppant volume. This fundamental review will aid reservoir, completion and stimulation engineers on the understanding of the factors that contribute to successful production from unconventional shale reservoirs.