Application of seismic methods in study of appreciate growth condition and occurrence of gas hydrate in Oman Sea
During the past two decades, marine researches have focused on gas hydrates because of many reasons that the most important of them is future energy resource potential. Gas hydrates are ice-like crystals that form a rigid cage of water molecules and entrap hydrocarbon and non-hydrocarbon gas by hydrogen bonding. There are many methods for prospecting gas hydrates. Seismic methods are the most applicable tools to study them. The presence of the suitable thermodynamic conditions, gas and water in appropriate amount and gas migration pathway from depth to sea floor sediment are necessary for growth and stability of gas hydrates and evaluation of these conditions are necessary for prospecting gas hydrates. The occurrence of gas hydrates and free gas in host sediments changes the elastic properties and makes them detectable with seismic methods. The important seismic indicators of gas hydrates are bottom simulating reflector, flat spot and bright spot. Therefore, the presence of the gas hydrates in host sediments are detectable with seismic indicators and the study of the gas hydrate anomalies are applicable with seismic attributes. In this article, the appropriate conditions for growth and stability of gas hydrates in OmanSea were examined with 2D seismic sections, the occurrence of the gas hydrates in sediments was proven with seismic indicators and the properties of their indicators were studied with reflection strength and apparent polarity attributes. Also the effect of the gas hydrates in attenuation of seismic wave amplitude was studied with spectral decomposition attribute. The results of this study prove the presence of gas hydrates in OmanSea.
Iranian Journal of Geophysics, Volume:2 Issue:2, 2008
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