Sedimentary Basins, Offshore Korea
  a. Yellow Sea Basin
         Yellow sea basin has been relatively less explored compared to other basins in offshore Korea. Exploration activities carried out in the basin are only five exploratory wells drilled in the northern depression and seismic survey with 5 x 5 Kms or more sparse grid. Total 33,784 L-kms of seismic data have been acquired in the South Yellow Sea Basin up to date. The thickness of Cretaceous to Paleocene strata is estimated at about 4000 m in the south-west sag and 1500 m in the central sag. The Eocene sedimentary rocks, as much as 3500 m in the south-west sag and 3000 m in the central sag, are well preserved. The tremendous thickness of the source and reservoir strata give rise to the prospectivity of this basin.
  b. Ulleung Basin
         Recently, gas discovery has been in the block VI-1 of Ulleung basin.

         Despite the exploratory drilling commenced in 1972, most of gas discoveries have been reported since late 80's, and the first commercial gas discovery based on new play concept has been reported by the well Gorae V in 1998. To date, a total of 15 wells have been drilled in the block VI-1 since 1972 and gas was discovered at nine of these. The high rate of gas discovery and the success at the Gorae V gas field give rise to expectation of high potential prospects around the block VI-1


  c. Che-Ju Basin
            To date 14 exploratory wells have been drilled in Che-ju basin. Of these, five have recorded encouraging indication of gas and/or oil shows. Total seismic coverage (2D) is about 58,000 L-km.

        Che-ju basin is divided into 8 separate depressions. Each of these is segmented by NE-SW trending prospective structure highs.
All the depressions contain a predominantly clastic sedimentary fill ranging in age from Paleogene to Recent. The thickness of sediments in the NE part of basin is estimated up to 7000 m. Two play systems are expected in the Che-ju Basin; Paleogene and Miocene play system. Various trap types exist within the basin and two major trap types are readily interpreted from 2D seismic data.

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Last Update: 8 August 2002