PRE-STACK TIME MIGRATION (PSTM) BERBASIS SEISMIC UNIX PADA DATA SEISMIK 2D CEKUNGAN BRYANT CANYON LEPAS PANTAI TELUK LOUISIANA TEXAS
DOI:
https://doi.org/10.25077/jfu.4.1.%25p.2015Abstract
ABSTRAK
Telah dilakukan pre-stack time migration (PSTM) berbasis Seismic Unix pada data 2D cekungan Bryant Canyon lepas pantai teluk Louisiana Texas. Penelitian ini menggunakan data Marmousi sebagai data uji untuk menentukan metode migrasi paling tepat. Dari hasil pengujian, metode Phase Shift, Finite-Difference dan Kirchhoff dipilih sebagai metode yang diterapkan pada data Bryant Canyon pada line 9 dan 12 yang diidentifikasi memiliki struktur kompleks (sinklin, patahan dan salt body) dan mengandung banyak noise (bowtie, difraksi dan multiple). Metode Phase Shift baik digunakan pada struktur yang memiliki kemiringan di atas 90Ëš sedangkan metode Finite-Difference mampu menangani variasi kecepatan horizontal dengan kemiringan yang terbatas. Metode Kirchhoff efektif menghilangkan pola-pola difraksi sehingga struktur yang ada pada penampang seismik terlihat jelas. Dari penelitian ini terlihat bahwa struktur bawah permukaan dengan variasi kecepatan vertikal dan lateral yang kompleks tidak dapat dipilih satu metode migrasi terbaik namun ketiganya saling menunjang dari segi struktur maupun penanganan noise.
Kata Kunci : metode Phase Shift, metode Finite Difference, metode Kirchhoff
Abstract
Seismic Unix based - pre-stack time migration (PSTM) on 2D seismic data of Bryant Canyon trough the Louisiana gulf of coast has been conducted. This research uses Marmousi data set to determine the most appropriate method of migration. From the test, Phase Shift, Finite-Difference and the Kirchhoff methods were chosen to be applied on line 9 and 12 of Bryant Canyon data set where complex structures such assyncline, fault and salt body and several types of noise e.g bowties, diffractions and multiples were identified. Phase Shift method is reliable for definiting structures that have slopes above 90Ëš where as Finite-Difference method is good in handling lateral velocity variation in the subsurface structure. Kirchhoff method eliminates diffraction patterns so that the existing structure is clearly visible in the seismic cross-section. From this research, it was found that for complex structures can not be selected one of excellentmigration methods but the three methods complimentary each other in terms of structure and handling noise.
Keywords : Phase Shift method, Finite-Difference method, Kirchhoff method
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