FRACTURE CHARACTERIZATION WITH FIELDWORK DATA AND ITS IMPLICATION FOR BASEMENT FRACTURE RESERVOIR AT MUARO SILOKEK GRANITIC OUTCROPS Wildan Tri Koesmawardani*1, Benyamin Sapiie2, Alfend Rudyawan2
1Geological Engineering Department, Universitas Trisakti
2Geological Engineering Department, Institut Teknologi Bandung
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 espacially with fieldwork data. The aim of the study is to determining fracture atributes like fracture spacing, fracture aperture, fracture length with total 2700 cm scan line and 490000 cm² area of widows scan in five location damage zone and relate with fracture reservoir. The result shows generally shear fracture have three main orientation, there were NE – SW, NNW – SSE, ENE – WSW and NNE – SSW, W – E, NW – SE for joint orientation. There were three types of granitic, namely syeno granite, alkali feldspar granite, and monzo granite shows each type of granite has a different response of fracture intensity and fracture density. Statistically, fracture porosity and permeability result shows linier data distribution with cubes calculation methods. This fracture permeability has exponential data distribution with fracture aperture.
Keywords: Fieldwork, scan line, windows scan, fracture porosity, fracture permeability
