Identifikasi Gas Hidrat pada Cekungan Simeuleu di Lintasan BGR-135 Menggunakan Analisis AVO (Amplitude Versus Offset)
DOI:
https://doi.org/10.25077/jfu.7.4.305-311.2018Abstract
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) untuk analisis AVO. Pengolahan data seismik dimulai dari input 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
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Copyright (c) 2018 Rahmi Nanda Pertiwi, Trevi Jayanti Puspasari, Elistia Liza Namigo, Dwi Pujiastuti
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