ROCK PHYSICS MODELING AND AZIMUTHAL AVA IN FRACTURED MEDIUM

• Main Author: Reza Mutaqin, Muhammad
• Format: Theses
• Language: Indonesia
• Subjects: Ilmu kebumian
• Online Access: https://digilib.itb.ac.id/gdl/view/32554
• Institution: Institut Teknologi Bandung

Most reservoirs today, such as carbonate, tight sand and basement reservoir, are often affected by the presence of fractures. This phenomenon is interesting to study because these fractures not only have porosity to store fluids such as oil and gas, but can also increase fluid permeability to flow to the drilling well. There are several methods to investigate the presence of these fractures, one of which is to use seismic multi-azimuth. This method can not only map the fracture distribution, but also the direction of the dominance of the fracture. At shallow depths, many horizontal-directed fractures like coating on the shale. But for deep depths, many are dominated by vertical directed fractures, even combinations. In this study, fracture phenomenon was modeled using physical modeling of rocks in anisotropic medium using the Hudson penny-shaped crack (1981) model and continued by modeling the AVO azimuthal for both VTI, HTI and Ortorombic medium using the Ruger (1997) equation. From the modeling results, it was found that the effect of this fracture was closely related to the anisotropic parameters and more visible for the larger angle of incidence. The response and intensity of the reflection amplitude can differ depending on the filler inclusion material. The amplitude response for gas is lower when compared to brine. Not only that, Fracture that is perpendicular to one another can result in a pitfall like the absence of anisotropy, even though it is a combination of two sets of perpendicular fractures.