ROCK PHYSICS MODELING AND AZIMUTHAL AVA IN FRACTURED MEDIUM

• Main Author: REZA MUTAQIN (NIM: 22316005), MUHAMMAD
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29319
• Institution: Institut Teknologi Bandung

<p align="justify">The presence of fractures can cause the anisotropy phenomenon in rocks. The existence of this anisotropy can be detected in far seismic data as well as multi azimuth seismic. At shallow depths, many horizontal-directed fractures like on the shale. But for the deep depths, many are dominated by vertical fractures, even their combinations. In this study I model the physical phenomena of rocks in anisotropic medium using the Hudson penny-shaped crack (1981) model and modeling azimuthal AVO for both VTI, HTI and Ortorombic medium using the Ruger (1997) equation. From the modeling results showed that the effect of anisotropy parameters is increasingly visible for a larger angle of arrival, as well as for HTI and ortorombic medium, the effect is more visible on different azimuths. The response of the amplitude of the reflection depends on the crack fluid-filling materials. The amplitude response and intensity for gas is lower when compared to brine. Fractures that are perpendicular to each other can result in a pitfall such as the absence of anisotropy, even though it is a combination of two sets of perpendicular fractures.<p align="justify">