3차원 탄성파 자료와 지구통계 앙상블 모델링을 이용한 서해 이산화탄소 저장소 암상·공극률 모델 및 불확실성 평가

초록

Carbon capture and storage (CCS) is one of the key technologies for achieving carbon neutrality. It serves as a transitional strategy to systematically reduce carbon emissions from the existing fossil fuel-based industrial system. In particular, the geological storage of carbon dioxide constitutes a critical component for achieving large-scale carbon reduction; this requires a quantitative evaluation of the spatial distribution of reservoir properties and their inherent uncertainties. In this study, we evaluated the distribution and associated uncertainty of reservoir properties within the Early Miocene stratigraphic unit SU5, a proposed prospective CO2 storage formation, using three-dimensional seismic data acquired from the western offshore region of the Korean Peninsula. Acoustic impedance derived from seismic data was utilized to construct geostatistical models of the spatial distribution of rock facies and porosity, and a probabilistic framework was implemented to account for the limited availability of well data. In addition, an ensemble of models incorporating variations in key geostatistical parameters was generated to evalute the spatial variability of reservoir properties. This approach aimed to derive more robust and reliable reservoir property models than those obtained using a single deterministic approach.

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