Fracture characterization with fieldwork data and its implication for basement fracture reservoir at Muaro Silokek Granitic Outcrops

Abstract

The Muaro Silokek Area is a location that is quite complex in geological structure and consists of granitic rocks which vary in mineral composition, so it’s fit to do fieldwork for fracture characterization for analog basement fracture reservoir. This research was continuance of previous study about granitic basement fracture at around Sumatra, now especially with fieldwork data. The aim of the study is to determining fracture characteristics like fracture spacing, fracture aperture, fracture length by using fieldwork data to determine fractal analysis and relate it to fracture reservoir. Those research conducted by using scanline and windows scan method with total 2700 cm scan line and 490000 cm2 area of widows scan in five location damage zone. The result shows generally shear fracture have three main orientations, there were NE – SW, NNW – SSE, ENE – WSW and NNE – SSW, W – E, NW – SE for joint orientation. Cumulative distribution of fracture spacing, fracture aperture, fracture length at five location scan line and window scan following power law. Statistically, fracture porosity and permeability result shows linier data distribution with cubes calculation methods. This fracture permeability has exponential distribution relationship with fracture aperture, and fracture porosity has power distribution relationship with fracture spacing.