Aplikasi Atribut Spectral Decomposition pada Data Seismik 3D Penobscot

Putra, Maulana Fakhrudin Fania (2017) Aplikasi Atribut Spectral Decomposition pada Data Seismik 3D Penobscot. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penampang seismik yang kerap diamati merupakan komposit dari rentang frekuensi tertentu. Penampang dengan kandungan frekuensi berbeda akan menunjukkan kenampakan geologi yang berbeda pula. Hal ini disebabkan sifat geologi seperti ketebalan atau kandungan fluida hanya akan lebih jelas bila diamati pada rentang frekuensi yang sesuai. Pada penelitian ini, dilakukan pemanfaatkan atribut seismik dekomposisi spektral untuk memetakan persebaran sandstone pada data seismik 3D Penobscot. Selain data seismik, digunakan juga dua data sumur, B-41 dan L-30. Perangkat lunak yang digunakan adalah IHS Kingdom dan OpendTect. Zona target pada penelitian ini berada pada Formasi Missisauga. Pengolahan data diawali dengan dilakukannya well to seismic tie, pada sumur B-41 didapatkan nilai koefisien korelasi 0.730 dan pada sumur L-30 sebesar 0.706. Wavelet yang digunakan adalah statistical wavelet jenis Ricker dengan frekuensi 25 Hz dan rotasi fase 45o. Setelah itu, dilakukan interpretasi lapisan melalui picking horizon pada lapisan Upper Misisauga (-2125 hingga -1875 ms), Middle Missisauga (-2125 hingga -2000 ms), dan Lower Missisauga (-2625 hingga -2325 ms). Penerapan atribut dekomposisi spektral dilakukan dengan metode Continuous Wavelet Transform (CWT). Frekuensi yang digunakan adalah 7 Hz, 16.7 Hz, dan 40 Hz, pemilihan frekuensi didasarkan pada bentukan spektrum dari data seismik yang digunakan. Setelah itu, dilakukan analisis color blending untuk mendapatkan penampang spektral hasil penerapan atribut. Dari proses penelitian yang dilakukan, didapati kesimpulan bahwa kandungan sandstone pada Formasi Missisauga memiliki frekuensi dengan rentang 7 Hz – 40 Hz. =============================================================================================== Seismic section that usually observed is the result of a certain frequency composition. A section that contained different frequency will show different geological features. This is due to geological properties like thickness or fluid content will only be apparent to be observed in the appropriate frequency range. In this study, the writer did the utilization of spectral decomposition attribute for mapping the spreading of sandstone in 3D seismic data Penobscot. Besides seismic data, two well data, B-41 and L-30 were also used. The software used were IHS Kingdom and OpendTect. The target zone in this study was in Missisauga Formation. Data processing was begun by doing well to seismic tie, on well B-41, the value of correlation coefficient obtained was 0.730, on the other side, well L-30 got the value of 0.706. Wavelet used in this kind of process was statistical wavelet with the type of Ricker. The frequency was 25 Hz and rotated at 45o of phase. After that, layers were interpreted by doing horizon picking on Upper Missisauga (-2125 to -1875 ms), Middle Missisauga (-2125 to -2000 ms), and Lower Missisauga (-2625 to -2325 ms). The application of spectral decomposition attribute was done by Continuous Wavelet Transform (CWT) method. The frequency used were 7 Hz, 16.7 Hz, and 40 Hz. The Frequency selection was based on the spectrum formation of the seismic data sued. After that, color blending analysis was done to get spectral section result of attribute application. From the study process conducted, it was found that the content of Sandstone on Missisauga Formation had a frequency with the range of 7 Hz – 40 Hz.

Item Type: Thesis (Undergraduate)
Additional Information: RSGf 551.220 287 Put a-1
Uncontrolled Keywords: Spectral decomposition, frequency, color blending
Subjects: Q Science > QE Geology > QE571 Sedimentation and deposition. Sediment transport.
Q Science > QE Geology > QE601 Geology, Structural
Divisions: Faculty of Civil Engineering and Planning > Geophysics Engineering > (S1) Undergraduate Theses
Depositing User: MAULANA FA FAKHRUDIN FANIA PUTRA
Date Deposited: 26 Oct 2017 07:04
Last Modified: 05 Mar 2019 02:34
URI: http://repository.its.ac.id/id/eprint/41983

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