IDENTIFIKASI GAS HIDRAT PADA CEKUNGAN SIMEULEU DI LINTASAN BGR-135 MENGGUNAKAN ANALISIS AVO (Amplitude Versus Offset)

Rahmi Nanda Pertiwi, Tiwi (2018) IDENTIFIKASI GAS HIDRAT PADA CEKUNGAN SIMEULEU DI LINTASAN BGR-135 MENGGUNAKAN ANALISIS AVO (Amplitude Versus Offset). Diploma thesis, UNIVERSTAS ANDALAS.

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Abstract

Hasil pengolahan data seismik laut 2D menghasilkan indikasi adanya gas hidrat pada lintasan BGR-135 yang kemudian divalidasi dengan analisis Amplitude Versus Offset (AVO). Daerah penelitian berlokasi di Cekungan Simeuleu yang terdapat di pantai barat Sumatera. Software ProMax digunakan untuk pengolahan data seismik dan Software HRS (Humpson Russel) digunakan untuk analisis AVO. Pengolahan data seismik dimulai dari input berupa raw data serta dilakukan proses prosesing (filtering, editing, dekonvolusi, analisis kecepatan, stacking, migrasi) hingga didapatkan output berupa data pre stack dan post stack. Data post stack kemudian diinterpretasi untuk menentukan zona fokus yang mengindikasikan keberadaan gas hidrat yang ditandai dengan kenampakan Buttom Simulating Reflector (BSR). Dari hasil interpretasi, indikasi kehadiran BSR terdapat pada CDP 26318 sampai 26354 dan TWT 1590 ms sampai 1660 ms. Data seismik pre stack yang telah ditentukan batasan CDP dan kedalaman dari zona fokus, dijadikan input untuk analisis AVO. Analisis AVO dilakukan pada rentang daerah target di lapisan terindikasi BSR dengan menentukan nilai gradient dan crossplot. Dari analisis diperoleh nilai gradient positif dan crossplot berada pada kuadran AVO kelas III. Gradient positif menandakan adanya anomali amplitudo pada zona fokus sedangkan AVO kelas III menandakan adanya indikasi hidrokarbon pada zona fokus. Kata kunci : Analisis Versus Offset (AVO) , Gas hidrat, Bottom Simulating Reflector (BSR), Cekungan Simeuleu ABSTRACT The result of seismic marine 2D indicated BSR in line BGR-135 which then validated by AVO Analysis. Research area is located in forearc basin Simeuleu - West Coast of Sumatera. Promax used for processing marine seismic 2D data and HRS (Humpson Russel) used for AVO analysis. Seismic data processing was carried out with raw data as input which then going through filtering, editing, deconvolution, velocity analysis, stacking and migration resulted in pre stack and post stack data as ouputs. Post-stack data is interpreted to determine zone of interest which indicates the presence of gas hydrate with the appearance of a Buttom Simulating Reflector (BSR). Then, the seismic pre stack data (which the CDP limit and the depth of the focus zone has been determined) is used as input for AVO analysis. Indication of BSR is identified at CDP 26318 to 26354 and depth 1590 ms to 1660 ms. AVO Analysis is applied in the target through gradient and crossplot analysis. AVO analysis shows that the gradient is positive and the crossplot resulted in AVO class III. Positive gradient indicates that there is amplitude anomaly in the target zone while AVO class III indicates hydrocarbon content in the zone. Keywords: Analysis Versus Offset (AVO), Gas hydrate, Bottom Simulating Reflector (BSR), Simeuleu Basin

Item Type: Thesis (Diploma)
Primary Supervisor: Dwi Pujiastuti, M.Si
Subjects: Q Science > QC Physics
Divisions: Fakultas Matematika dan Ilmu Pengetahuan Alam > Fisika
Depositing User: s1 fisika fisika
Date Deposited: 16 Oct 2018 16:10
Last Modified: 16 Oct 2018 16:10
URI: http://scholar.unand.ac.id/id/eprint/38612

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