ATENUASI MULTIPLE PADA DATA SEISMIK 2D CEKUNGAN BRYANT CANYON LEPAS PANTAI TELUK LOUISIANA TEXAS

Authors

  • Ade Saputra Jurusan Fisika FMIPA Universitas Andalas, Padang Kampus Unand Limau Manih, Pauh Padang 25163
  • Elistia Liza Namigo Jurusan Fisika FMIPA Universitas Andalas, Padang Kampus Unand Limau Manih, Pauh Padang 25163

DOI:

https://doi.org/10.25077/jfu.4.4.%25p.2015

Abstract

ABSTRAK

Telah dilakukan atenuasi multiple berbasis Seismic Unix pada data seismik 2D laut dalam (3000- 5000 meter) pada cekungan Bryant Canyon lepas pantai teluk Louisiana Texas. Atenuasi dilakukan pada empat line seismik dengan metode Predictive Deconvolution, Transformasi Radon, dan kombinasi Predictive Deconvolution dengan Transformasi Radon atau disebut TauP Deconvolution. Penelitian ini ditujukan untuk mengetahui efektifitas ketiga metode dalam mengatenuasi multiple pada data seismik laut dalam dengan struktur geologi kompleks. Pada keempat line seismik tersebut teridentifikasi water-bottom, peg-leg, dan intrabed multiple. Metode Predictive dan TauP Deconvolution efektif digunakan untuk menghilangkan peg-leg, intrabed multiple, dan multiple di sekitar kubah garam (pada line 3) namun tidak dapat mengatenuasi water-bottom multiple. Kedua metode juga berhasil meningkatkan signal to noise ratio serta memperbaiki dead trace. Metode Transformasi Radon terbukti tidak efektif untuk mengatenuasi multiple laut dalam dengan morfologi yang kompleks.

Kata Kunci :   Multiple, Predictive Deconvolution, Transformasi Radon, TauP Deconvolution.

Abstract

Seismic Unix based - multiple attenuation has been performed on 2D seismic data on deep ocean (3000-5000 metres) of Bryant Canyon basins offshore Louisiana Gulf Texas. Attenuation was performed on four seismic lines by Predictive Deconvolution, Radon Transform, and the combination of Predictive Deconvolution and Radon Transform or called the TauP Deconvolution methods. This study aimed to find out the effectiveness of the three methods in multiple attenuation on marine seismic data in structure geological complex. Water-bottom, peg-leg, and intrabed multiples were identified in the four seismic lines. Predictive Deconvolution method and TauP Deconvolution methods are effective for removing peg-leg, intrabed and salt-related multiples (identified on seismic line 3) but the two methods fail to attenuate water-bottom multiples. The two methods have also successfully enhanced signal to noise ratio and fixed the dead traces. Radon transform method was prooped to be in effective for deep water and complex structure multiple elimination.

Keywords :  Multiple, Predictive Deconvolution, Radon Transform, TauP Deconvolution.

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Published

2024-10-26

Issue

Vol. 4 No. 4: Oktober 2015

Section

Articles

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Copyright (c) 2024 Ade Saputra, Elistia Liza Namigo

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