Characterization of Fractures in Carbonate Reservoirs of North Zone of Pakistan Using Formation Micro Image Logs Technique

Abstract

Fracture characterization is an important technique to locate and point out the area, depth, fracture geometry, fracture orientation, fracture aperture, fracture dip, fracture density and occurrence of fractures. In petroleum Industry, knowledge about the fractures is very critical due to lying underline formations of oil and gas. Carbonate reservoirs having low porosity, fractures are the only source of holding capacity (porosity source) and delivering (permeability source) towards the production well. Fractures usually provide fluid flow path from reservoir to the production well. Matrix feeds oil and gas into the fracture and fractures are the source of permeability channels for the carbonate reservoirs having low porosity and low permeability. Production operations in oil and gas reservoirs totally depend on fracture characterization especially in Naturally Fractured Carbonate Reservoirs. Formation Micro Image Log is most advanced technique that can provide real time information about the Fracture orientation, Fracture geometry, Fracture dip, Fracture density at certain intervals of depth. In this study, micro image logs are the techniques used to predict the fracture areas, Lithology, type of fracture with respect to depth. Here, case studies of different wells from North zone of Pakistan have been interpreted and analyzed to validate the fracture characterization of carbonate reservoirs.