STUDI PENCITRAAN STRUKTUR BAWAH PERMUKAAN BUMI MENGGUNAKAN PEMODELAN CONSTRAINED VELOCITY INVERSION DAN GRID BASED TOMOGRAPHY PADA LINTASAN GMR165 DI DAERAH TELUK CENDRAWASIH

Gamal Muhammad Rizka

Abstract


 
 
Prestack Depth Migration (PSDM) method has been applied to image the subsurface at Line GMR165 in Cendrawasih Bay. Imaging   and   positioning   is   the  most  important   issue   in seismic   data   processing.   In   the complex area case with lateral variation velocity , PSDM has more benefit than PSTM . It cause  the   ability   of   PSDM   method   that   can   focus just   for  one   reflector   when lateral velocity change.
 
In this study used constrained velocity inversion modelling method. This method is designed to make an initial interval velocity model for PSDM and updated in grid based tomography to got the best velocity so that the result had  continuous PSDM reflector with flat gather. That interval velocity applied to PSDM to get seismic image section and compared with PSTM (prestack time migration) seismic section based on it’s image and velocity model analysis. Seismic section of PSDM shows a significant image enhancement. It is able to assure the reflection pattern at the horizons with strong lateral velocity variations and makes image resolution more coherence than seismic section of PSTM. This study is very valuable to build exploration concept and development area, especially in a complex structure with strong lateral velocity variations.

Keywords: Pre Stack Depth Migration, Constarined Velocity Inversion, Grid Based
Tomography.
 


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DOI: http://dx.doi.org/10.23960/jge.v1i02.209

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University of Lampung
Website: http://journal.eng.unila.ac.id/index.php/geo
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Copyright (c) JGE (Jurnal Geofisika Eksplorasi)
ISSN 2356-1599 (Print); ISSN 2685-6182 (Online)