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Study on Density Discontinuous Layers of the Kunsan Basin in the Yellow Sea Using Satellite Altimetry Gravity Data  

Kim, Kyong-O (Korea Institute of Geoscience and Mineral Resources)
Oh, Jae-Ho (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Economic and Environmental Geology / v.40, no.6, 2007 , pp. 751-759 More about this Journal
Abstract
To better understand the subsurface geological structure of the Kunsan Basin in the Yellow Sea, the mean depths of the density discontinuous layers (DDLs) of the Kunsan Basin were calculated by power spectrum analysis using satellite altimetry gravity data. The calculated mean depths of DDLs were -1.1km, -3.4km, -9.1km and -31.0km. The mean depth of -1.1km DDL was interpreted as regional unconformity shown in about 1 second in two way travel time (TWTT) in the seismic reflection profiles, and the mean depth of -3.4km DDL was also interpreted as top of the acoustic basement in the seismic reflection profiles. Comparing with well data, seismic reflection profiles and regional geology in the study area, the mean depth of -9.1km DDL was interpreted as top of the igneous origin basement. This means that the acoustic basement of the study area is composed mainly of sediments which are disregarded in previous study. The mean depth of -31.0km DDL was interpreted as the Moho discontinuity because this mean depth is similar to one of the normal continental crust thickness. The detection of top of the igneous origin basement suggests that oil gas potential analysis in Kunsan Basin needs to be extended to the deeper part of sediments (acoustic basement).
Keywords
Kunsan Basin; Satellite altimetry gravity data; Power spectrum analysis; Density discontinuous layer; Oil.gas potential;
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