#TITLE_ALTERNATIVE#

• Main Author: LAELA SULASTRI (NIM : 123 04 010); Pembimbing : Setianingsih, ST, MT; Dr. Alfian Bahar MT., WINI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/17582
• Institution: Institut Teknologi Bandung

On the basic seismic survey planning and data-processing which has been done before, the earth is assumed isotropy, but in fact the earth is known as anisotropy <br /> <br /> <br /> <br /> <br /> and heterogeneous. The most common anisotropy case in hydrocarbons exploration is Vertical Transversely Isotropy (VTI) media. In this case, the research is done to have a better understanding in characteristic of PS converted wave, especially in mapping a shifting of conversion point (Xp) on medium anisotropy (VTI), by compare it to isotropy media. It is expected to assist us in preparing the QC (Quality Control) on Common Conversion Point (CCP)-gather in processing of converted wave data. Mathematics modeling and physical modeling were conducted in this research. Mathematics modeling is developed using Thomsen’s anisotropy equations (1986) <br /> <br /> <br /> <br /> <br /> and the simple principle of Snell’s law. Anisotropy model were built from the initial model of isotropy. This horizontal displacement of the conversion point in VTI media from that in the isotropy case is dependent on the offset-to-depth ratio, velocity ratio Vp/Vs, and anisotropy parameters defined by Thomsen. When &#948; <&#949;, for the same offset, the conversion point moves towards the source in VTI media relative to that in the isotropy case, while when &#948; &#8805; &#949; the conversion point moves towards the receiver in VTI media relative to that in the isotropy case. The displacement of the conversion <br /> <br /> <br /> <br /> <br /> point from that in the isotropy case increases with the increasing offset-to-depth ratio and the value of &#949;. The velocity ratio doesn’t have a significant influence on the displacement of the conversion point for small offset/depth, but has an influence on for large offset/ depth. Physical modeling is done on anisotropy media and isotropy media in the laboratorium to find out the type of converted wave that has generated. Has been <br /> <br /> <br /> <br /> <br /> obtained that the type of waves generated from the conversion of all the medium is the converted wave from P to SV waves.