OPTIMALISASI PENCITRAAN STRUKTUR BAWAH PERMUKAAN MENGGUNAKAN METODE KIRCHHOFF PRE-STACK TIME MIGRATION PADA DATA SEISMIK LAUT WETAR

Syamsurijal Rasimeng, Amelia Isti Ekarena, Bagus Sapto Mulyanto, Subarsyah Subarsyah, Andrian Wilyan Djaja

Abstract


Migration is one of the stages in seismic data processing aimed at returning the diffraction effect to the actual reflector point. The processing of a seismic data is adjusted to the existing problems in the data itself, so the accuracy in using the migration technique and determination of data processing parameters greatly affects the resulting seismic cross-section. Kirchhoff Pre-Stack Time Migration is one of the most used migration methods in seismic data processing because it shows better results than conventional stacking methods. The parameters that need to be noticed in the Kirchhoff migration are the migration aperture values. Based on this, variations of migration aperture values used are 75 m, 200 m and 512.5 m. The 512.5-m aperture migration value shows the best seismic cross-section results. This is evidenced by the capability in eliminating bowtie effects around CDP 600 up to CDP 800, eliminating diffraction effects around CDP 3900 to CDP 4050, and showing a seismic cross-section with better lateral resolution compared to the migration value of the aperture of 75 m and 200 m. Based on the seismic cross-section of migration results, the geological structure that can be identified is a fault that found in some CDP.


Keywords


PSTM; Kirchhoff; Aperture

Full Text:

PDF

References


Bednar, J. (2008). Modeling, Migration and Velocity Analysis in Simple and Complex Structure. http://www.panoramatech.com/papers/migration.pdf

Bonomi, E., & Cabitza, G. (1994). Migration of seismic data. Journal of Statistical Physics, 76(1–2), 703–723. https://doi.org/10.1007/BF02188682

Dewanto, O. (2004). Seismik Eksplorasi. Jurusan Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Lampung.

Ku, C.-Y., & Hsu, S.-K. (2009). Crustal structure and deformation at the northern Manila Trench between Taiwan and Luzon islands. Tectonophysics, 466(3–4), 229–240. https://doi.org/10.1016/j.tecto.2007.11.012

Naess, O. E., & Bruland, L. (1985). Stacking methods other than simple summation. Developments in geophysical exploration methods - 6.

Siraju, A., Hutabarat, J., Sukiyah, E., & Haryanto, A. D. (2018). Analisis Kandungan Mineral dan Logam Oksida Pada Singkapan Batuan Vulkanik yang Termanivestasi Alterasi Hidrothermal di Wilayah Pertambangan PT. Batutua Tembagaraya Pulau Wetar Provinsi Maluku. Bulletin of Scientific Contribution : Geology, 16(3), 149–162.

Subarsyah, S., & Rahardiawan, R. (2016). Geological Structures Appearances and Its Relation to Mechanism of Arc-Continent Collision Northen Alor-Wetar Islands. BULLETIN OF THE MARINE GEOLOGY, 31(2), 55–66. https://doi.org/10.32693/bomg.31.2.2016.326

Sutrisno. (1997). Fisika Dasar: Gelombang Optik. ITB Press.

Telford, W. M., Geldart, L. P., & Sheriff, R. E. (1990). Applied geophysics. 2nd edition. Cambridge University Press.

Yilmaz, Ö. (2001). Seismic Data Analysis. In Investigations in geophysics. Society of Exploration Geophysicists. https://doi.org/10.1190/1.9781560801580




DOI: https://doi.org/10.23960/jge.v6i2.67

Refbacks

  • There are currently no refbacks.


Copyright (c) 2020 Jurnal Geofisika Eksplorasi

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.


This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.


Publisher

Geophysical Engineering Department, Engineering Faculty, Universitas Lampung
Website: https://jge.eng.unila.ac.id/index.php/geoph/index

Email: jge.tgu@eng.unila.ac.id
 
 
Copyright (c) JGE (Jurnal Geofisika Eksplorasi) 
 
ISSN 2356-1599 (Print); ISSN 2685-6182 (Online)