Seismic Methods for Exploration and Exploitation of Gas Hydrate

Abstrak: Gas hidrat merupakan sumber energi nonkonvesional yang kuantitasnya hampir dua kali lebih banyak apabila dibandingkan dengan energi yang bersumber dari fosil. Oleh karena itu, penulis memiliki tujuan untuk mengembangkan potensi gas hidrat tersebut dan mengindikasikan potensi persebaran serta pembentukannya di Indonesia. Metode penelitian yang digunakan yaitu studi pustaka yang bersumber dari literatur seperti jurnal, artikel, dan buku. Berdasarkan penelitian ini, potensi cadangan gas hidrat di Indonesia dapat ditemukan di wilayah perairan Indonesia terutama perairan laut dalam seperti di Cekungan Busur Muka Simeulue, Sumatera dan Selat Makassar. Selain itu, potensi tersebut juga didukung oleh adanya kegiatan tektonik yang terjadi Indonesia. Metode geofisika seismik, BSR (Bottom Stimulating Reflector) dan analisa AVO merupakan beberapa metode yang digunakan untuk mengindikasikan adanya keberadaan potensi gas hidrat di suatu daerah. Gas hidrat dapat menjadi substitusi bagi bahan bakar fosil dan berpotensi masuk tahap eksplorasi dan eksploitasi, sehingga dibutuhkan studi lanjutan agar dapat diproduksi secara komersial. Kata Kunci: bottom stimulating reflector (BSR), gas hidrat, Indonesia, laut dalam, seismik Abstract: Gas hydrate is a non-conventional energy source, which is almost twice as large as fossil energy sources. Therefore, the authors want to develop gas hydrate potential and indicate the potential for its distribution and formation in Indonesia. The research method used is literature study sourced from literature such as journals, articles and books. Based on this research, the potential gas hydrate reserves in Indonesia is found in Indonesian territorial waters, especially deep sea waters such as the Simeulue Forearc Basin, Sumatra and the Makassar Strait. In addition, this potential is supported by tectonic activity occurs in Indonesia. Seismic geophysical methods, BSR (Bottom Stimulating Reflector) and AVO analysis are some of the methods used to indicate presence gas hydrate potential in area. Gas hydrate can be substitute fossil fuels and has the potential enter the exploration and exploitation stage, so further studies needed so that it can be produced commercially. Keywords: bottom stimulating reflector (BSR), deep sea, gas hydrate, Indonesia, seismic

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SEISMIC TRAVELTIME TOMOGRAPHY APPLIED TO DATA FROM MIRANGA FIELD, RECÔNCAVO BASIN, BRAZIL

Brazilian Journal of Geophysics ◽

10.22564/rbgf.v34i3.856 ◽

2016 ◽

Vol 34 (3) ◽

Author(s):

Vitor Hugo Serravalle Reis Rodrigues ◽

Amin Bassrei

Keyword(s):

High Resolution ◽

Reservoir Characterization ◽

Seismic Inversion ◽

Oil Exploration ◽

Exploration And Exploitation ◽

Traveltime Tomography ◽

Seismic Methods ◽

Global Demand ◽

Alternative Means

ABSTRACT. The growing global demand for hydrocarbons has tested the limits of oil exploration and exploitation technologies. Among the seismic methods, tomography is an alternative means for high-resolution characterization of reservoirs, and it enables a more efficient...Keywords: reservoir characterization, traveltime tomography, seismic inversion, regularization, Recôncavo Basin. RESUMO. A crescente demanda mundial por hidrocarbonetos tem testado os limites das tecnologias de exploração e explotação de petróleo. Dentro dos métodos sísmicos, a tomografia surge como alternativa de caracterização de alta resolução dos reservatórios,...Palavras-chave: caracterização de reservatórios, tomografia de tempos de trânsito, inversão s´ísmica, regularização, Bacia do Recôncavo.

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Feasibility of Monitoring Gas-Hydrate Production With Time-Lapse Vertical Seismic Profiling

SPE Journal ◽

10.2118/132508-pa ◽

2010 ◽

Vol 15 (03) ◽

pp. 634-645 ◽

Cited By ~ 4

Author(s):

Michael B. Kowalsky ◽

Seiji Nakagawa ◽

George J. Moridis

Keyword(s):

Gas Hydrate ◽

Geophysical Methods ◽

Rock Physics ◽

Time Lapse ◽

Time Interval ◽

Scale Production ◽

Seismic Profiling ◽

Vertical Seismic Profiling ◽

Seismic Methods ◽

Geophysical Surveys

Summary Many studies involving the application of geophysical methods in the field of gas hydrates have focused on determining rock-physics relationships for hydrate-bearing sediments, with the goal being to delineate the boundaries of gas-hydrate accumulations and to estimate the quantities of gas hydrate that such accumulations contain using remote-sensing techniques. However, the potential for using time-lapse geophysical methods to monitor the evolution of hydrate accumulations during production and, thus, to manage production has not been investigated. In this work, we begin to examine the feasibility of using time-lapse seismic methods—specifically, the vertical-seismic-profiling (VSP) method—for monitoring changes in hydrate accumulations that are predicted to occur during production of natural gas. A feasibility study of this nature is made possible through the coupled simulation of large-scale production in hydrate accumulations and time-lapse geophysical (seismic) surveys. We consider a hydrate accumulation in the Gulf of Mexico that may represent a promising target for production. Although the current study focuses on one seismic method (VSP), this approach can be extended easily to other geophysical methods, including other seismic methods (e.g., surface seismic or crosshole measurements) and electromagnetic surveys. In addition to examining the sensitivity of seismic attributes and parameters to the changing conditions in hydrate accumulations, our long-term goals in this work are to determine optimal sampling strategies (e.g., source frequency, time interval for data acquisition) and measurement configurations (e.g., source and receiver spacing for VSP), while taking into account uncertainties in rock-physics relationships. The numerical-modeling strategy demonstrated in this study may be used in the future to help design cost-effective geophysical surveys to track the evolution of hydrate properties. Here, we describe the modeling procedure and present some preliminary results.

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