--> Abstract: Reconstruction of Burial Diagenesis by 2-D Sedimentary Simulation and Analysis of Petroleum Potential of the Upper Tertiary Sequences in Southern Ulleung Sedimentary Basin, East Sea (Sea of Japan), by Daekyo Cheong and Daehong Kim; #90124 (2011)
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AAPG ANNUAL CONFERENCE AND EXHIBITION
Making the Next Giant Leap in Geosciences
April 10-13, 2011, Houston, Texas, USA

Reconstruction of Burial Diagenesis by Previous Hit2-DNext Hit Sedimentary Simulation and Analysis of Petroleum Potential of the Upper Tertiary Sequences in Southern Ulleung Sedimentary Basin, East Sea (Sea of Japan)

Daekyo Cheong1; Daehong Kim1

(1) Geology, Kangwon National University, Chuncheon, Korea, Republic of.

The southwestern margin of the Ulleung basin, East Sea (Sea of Japan) is an area where recently produces commercial natural gas and condensate. A total of 17 exploratory wells have been drilled, and also many seismic explorations have been carried out since early 1970s. Among the wells and seismic sections, the Gorae 1 well and a seismic section through the Gorae 1-2 well were chosen for reconstruction of burial diagenesis in terms of Previous Hit2-DNext Hit sedimentary simulation. The study area is a suitable place for modeling a petroleum system and evaluating hydrocarbon potential of reservoir. Shale as a source rock is about 3500m deep from sea floor, and sandstones interbedded with thin mud layers are distributed as potential reservoir rocks from 3,500m to 2,000m deep. On top of that, shales cover as seal rocks and overburden rocks upto 900m deep. The thermal maturity of the potential source rock was calculated from known thermal gradient data. In this study area, only gas and condensate have been found and commercially produced, and the result of Previous Hit2-DNext Hit sedimentary simulation also shows that there is a gas window between 4000m and 6000m deep, so that three possible scenarios can be inferred from the simulation. First, oil has already moved and gone to the southeastern area along uplifting zones. Or second, oil has never been generated because organic matter is kerogen type 3, and or finally, generated oil has been converted into gas by thermally overcooking. Previous Hit2-DNext Hit sedimentary simulation has an advantage that it provides the timing and Previous HitdepthTop information of generated oil and gas with TTI values. Based on the result of our simulation, added exploratory wells are suggested to discover possible deeper gas reservoirs located in the study area.