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http://dx.doi.org/10.7582/GGE.2013.16.3.163

Amplitude Variation Analysis for Deep Sea Seismic Data in the Ulleung Basin, East Sea  

Cheong, Snons (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resouces)
Kim, Youngjun (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resouces)
Kim, Byungyup (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resouces)
Koo, NamHyung (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resouces)
Lee, Ho-Young (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resouces)
Publication Information
Geophysics and Geophysical Exploration / v.16, no.3, 2013 , pp. 163-170 More about this Journal
Abstract
The amplitude variation with offset of seismic data can detect fluids in the sediment and resolve the petrophysical properties of hydrocarbons in the subsurface. We analyzed and described the amplitude variation in deep sea seismic data obtained from the Ulleung Basin, East Sea. By inspecting seismic CDP-offset and CDP-angle gathers which show a bright reflection event, we decided a target zone for amplitude variation analysis. From the seismic angle gather at the middle of Ulleung Basin, we recognized amplitude increase or decrease versus offset on the intercept-gradient curve. Using the product attribute and Poisson's ratio change attribute computed in terms of intercept with gradient, the top and the base of gas saturated sediments were described. The area of amplitude variation suggestive of the presence of gas saturated sediments is shown at the depth of 3 s traveltime. Anomalous features of seismic amplitude in the Ulleung Basin were classified by the crossplot of intercept and gradient. The background trend of crossplot between intercept and gradient shows an inverse proportional relation that is common for wet sediments. Anomalous amplitudes of Class III fall into the first and the third quadrants on crossplots. We inferred regional gas/water saturated area with the horizontal dimension of 150 m in the Ulleung Basin by cross-section with respect to cross-plot anomaly.
Keywords
angle gather; amplitude variation; intercept; gradient; crossplot; crosssection;
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Times Cited By KSCI : 1  (Citation Analysis)
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