Identification and Characterization of Gas Hydrate using Marine Seismic and Well Data: South Makassar Strait case study Ahmad Wadi Muntashir (a*), Tumpal Bernhard Nainggolan (b), Eddy Supriyana (a)
a) Department of Geophysics, Padjadjaran University, Jl. Raya Bandung Sumedang Km. 21, Jatinangor, 45363, Indonesia
*rvrclm[at]gmail.com
b) Research Center for Geological Resources, National Research and Innovation Agency, Jl. Sangkuriang 21, Bandung, 40135, Indonesia
Abstract
Gas hydrate holds significant potential resource as a non-conventional alternative to current oil and gas resources. It is composed of gas molecules that is formed in sub-seabed layer characterized by high pressure and low temperature. The appearance of bottom simulating reflector (BSR) is the main indicator for the presence of gas hydrate during the seismic interpretation process. However, there is no significant study to determine distribution of gas hydrate-bearing sediments using post-stack time migration seismic data and well data on South Makassar Strait. Therefore, in this study, three seismic sections South Makassar Strait is analyzed, characterized and interpreted to determine distribution of gas hydrate by the presence of high amplitude, reversed polarity reflection, cross-cut reflection and cross-over density and porosity logs of sedimentary layer. This study uses three lines of 2D marine seismic post-stack time migration CM02-57, SM93-06 and SM93-08 and Kris-1 well. Based on the results, gas hydrates are indicated in three seismic lines. There are two areas on line CM02-57 identified with bottom simulating reflector and cross-over density and porosity logs, firstly CDP range of 7592-8311 on time depth 2700-2800 ms, and CDP range of 9832-10152 on time depth 2400-2500 ms. Line SM93-06 shows gas hydrate at CDP range of 4783-5762 on time depth 2900-3000 ms. Both lines are correlated with line SM93-08, which shows gas hydrate CDP range of 4119-4992 on time depth 2900-3000 ms. Those three lines indicates good distribution of gas hydrate potential on South Makassar Strait area.
Keywords: gas hydrate- bottom simulating reflector- post-stack time migration- South Makassar Strait
