Abstract

In recent times unconventional fractured Basement reservoir in the Mumbai High field has gained importance due to increasing requirements of hydrocarbon. Exploration and development of fractured Basement reservoirs needs assessment of the fracture network as the fractures control the reservoir porosity and permeability. Fracture modelling, based on the geological understanding of the relationship between fracture network and geological evolution of the area has been carried out for entire Mumbai high field in present study. 3D Geomechanical sequential restoration of horizon surfaces was carried out and differential strain was captured between restored and unrestored Basement. Discrete Fracture network (DFN) model has been generated by using differential Maximum Principal Strain (e1) as a proxy to input for fracture intensity. Four different fracture sets were modelled by constraining the model by observed fracture parameters from the wells. Susceptibility analysis of fracture sets to failure in present day stress regime show that the fracture set oriented in NNW-SSE direction has very high slip and dilation tendencies, and are optimally oriented and critically stressed to be in slip mode. The validated model can be used for fracture prediction in areas of poor or sparse seismic data for exploring basement sweet spots in new areas.