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GAS HYDRATE SEISMIC IDENTIFICATION AND CHARACTERIZATIONS IN X BASIN, WEST SULAWESI

Master Theses from JBPTITBPP / 2017-10-09 10:24:10
Oleh : WINA FITRIAH (NIM : 22310014), Department of Geophysical Engineering
Dibuat : 2012, dengan 1 file

Keyword : BSR, apparent polarity, instantaneous phase, AVO

Gas hydrate is solid solution which is formed when gas



molecules were trapped in crystal lattices that is



formed by water molecules at low temperature and



high pressure. So that gas hydrate commonly found in



permafrost and deep water ocean along continental



margin. In Indonesia, gas hydrate can be found in deep



ocean along subduction zone, such as Sunda Arc Basin



and X Basin. X Basin is located at western Sulawesi.



The presence of gas hydrate in nature can be



represented by Bottom Simulating Reflector (BSR) on



seismic section. BSR occur if gas hydrate bearing



sediment and gas/water bearing sediment below has a



negative contrast acoustic impedance. Those negative



value is caused by the increasing of P- and S-wave



velocity and density in gas hydrate bearing sediment.



3D seismic acquisition has been conducted in X



Basin. The data was processed so gas hydrate in this



basin can be identified and characterized. Firstly, the



preliminary seismic data processing was conducted to



produce a good quality seismic section/gathers.



Secondly, this seismic section/gathers are developed



by using advance seismic processing, such as seismic



attributes, and AVO methods. Unfortunately, there is



no well log data for this study, so the identification and characterization has been done as an estimation



without an accurate validation.



Seismic section/gathers in this study give



information about the presence of gas hydrate. BSRs



can be seen clearly almost in every along the crossline



direction and they can be used as preliminary



identification. Furthermore, RMS amplitude slice



section and apparent polarity resulted in the same way.



Through the seismic attribute method, gas hydrate



bearing sediment velocity can be estimated around



2000 m/s with 100 m of thickness.

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