Document Type : Original Research Paper
Authors
1 Research Institute of Petroleum Industry (RIPI), Tehran, Iran.
2 Mining Department, Faculty of Engineering, University of Tehran,Tehran, Iran
Abstract
Natural fractures are the main factor which control hydraulic behavior of oil and gas reservoir in naturaly fractured reservoirs. Thus it is important to fully characterize these features in fractured reservoirs. Image logs are one of powerful tools in fracture study in wells. Image log is high resolution “pseudo picture” of borehole wall which records properties of fractures. In present study, FMI (Formation Micro Scanner) of two wells located in the same structural setting of a naturally fractured carbonate are considered. Well A and B drilled through three formations (Asmari, Pabdeh and Gurpi) and fracture data of these formations were acquired from these wells. Both wells located in the same structural setting near each other. We compared fractures of each formation in well A with well B to find out similarity and dissimilarity of fractures occurd in the same formation in different wells. This study shows that density and orientation of bedding planes of well A is completely similar to well B. Density of open fractures of well A is totally different from well B but orientations of open fractures are same in two wells. Density and orientation of filled fractures of well A are similar to well B. Pattern of fractures of Asmari and Pabdeh formations are similar but in Gurpi fractures are different. Comparison of density of bedding planes and fractures show that high fracture frequency occurred in the thin beds, for example FMI show that laminar intervals of Pabdeh coincide with highly fractured intervals.
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