30 petroleum system modeling in Jeju Basin of the South Sea Shelf of Korea

초록

This study conducts a 3D petroleum system modeling of the Jeju Basin to evaluate whether the proven petroleum systems of the adjacent Xihu Basin can also be effective in the Jeju Basin. To enhance the reliability of the study, the latest 3D seismic data and geochemical datasets analyzed by advanced and high-resolution geochemical analytical techniques were integrated. In particular, geochemical re-analyses based on detailed lithofacies classfication of source rocks indicate that high-quality shale and coal-bearing strata were deposited during the Eocene and Oligocene, providing critical evidence for petroleum potential in the study area. Modeling results suggest that Eocene and Oligocene petroleum systems are working in the Jeju Basin: The Eocene petroleum system is mainly effective in the western slope belt, whereas the Oligocene petroleum system is evaluated to be effective in the central anticline inversion belt. Despite significant tectonic movements during the Late Miocene, hydrocarbon generation and expulsion are interpreted to have continued after major structural deformation events. This study have academic significance in that it visualize the timing of hydrocarbon generation, migration, and accumulation in 3-dimensions and evaluates regionally effective petroleum systems. Overall, the petroleum system proven in the Xihu Basin is considered applicable to the Jeju Basin. The results of this study are expected to contribute to establishment of future exploration strategies and to the reduction of exploration risk in the Jeju Basin.

키워드