Assessment of Facies and Porosity Uncertainty in a West Sea CO2 Storage Reservoir Using 3D Seismic–Driven Geostatistical Ensemble Modeling Techniques

Sangin Cho; Hyunmin Kim; Eunsil Park; Jwagyum Kim; Honggeun Jo; Joongmoo Byun; Sukjoon Pyun

doi:10.7582/GGE.2026.29.1.076

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2026 Vol.29, Issue 1 Preview Page Next Page

Research Article

Assessment of Facies and Porosity Uncertainty in a West Sea CO₂ Storage Reservoir Using 3D Seismic–Driven Geostatistical Ensemble Modeling Techniques 3차원 탄성파 자료와 지구통계 앙상블 모델링을 이용한 서해 이산화탄소 저장소 암상·공극률 모델 및 불확실성 평가

28 February 2026. pp. 76-86

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Abstract

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.

Keywords

CCS

Geostatistical Modeling

Gunsan Basin

3D Acoustic Impedance

Uncertainty Quantification

이산화탄소 포집 및 저장(Carbon Capture and Storage, CCS)은 탄소중립 달성을 위한 핵심 기술 중 하나로, 화석연료 중심의 현 산업체계에서 발생하는 탄소배출을 구조적으로 저감하기 위한 전환 기술이다. 특히 이산화탄소 지중 저장은 대규모 탄소 감축을 실현하기 위한 필수적인 기술 요소로서, 저장소 물성의 공간적 분포와 이에 수반되는 불확실성에 대한 정량적 평가가 요구된다. 본 연구에서는 한반도 서해권역에서 취득된 3차원 탄성파 탐사 자료를 활용하여, 이산화탄소 저장 유망층으로 제안된 전기 마이오세 퇴적층(SU5)의 저장소 물성 분포와 불확실성을 평가하였다. 탄성파 자료로부터 도출한 음향임피던스(acoustic impedance)를 기반으로 암상 및 공극률의 공간 분포를 지구통계학적으로 모델링하였으며, 시추공 자료가 제한적인 조건을 고려하여 확률론적 접근을 적용하였다. 또한 주요 지구통계 인자의 변동성을 반영한 모델 앙상블 구축을 통해 저장소 물성의 공간적 변동 특성을 분석하고, 이를 통해 단일 결정론적 모델보다 신뢰성 있는 저장소 물성 모델을 도출하고자 하였다.

키워드

이산화탄소 지중저장

지구통계 모델링

서해 군산 분지

3차원 음향 임피던스

불확실성 정량화

References

Choe, J. G., 2007, Geostatistics, Sigma Press (in Korean).

Choi, B. Y., Park, Y. C., Shinn, Y. J., Kim, K. Y., Chae, G. T., and Kim, J. C., 2015, Preliminary results of numerical simulation in a small-scale CO₂ injection pilot site: 1. Prediction of CO₂ plume migration, J. Geol. Soc. Korea, 51, 487-496 (in Korean with English abstract).

10.14770/jgsk.2015.51.5.487

Kim, A. R., Kim, H. M., Kim, H. W., and Shinn, Y. J., 2017, Geomechanical stability analysis of potential site for domestic pilot CCS project, Tunn. Undergr. Space, 27, 89-99 (in Korean with English abstract).

Kim, D., Kim, J., Lee, G., Lee, J., and Byun, J., 2024, Development of process for extracting reservoir properties on CO₂ storage prospect from geophysical data in the West Sea Basin, 122nd Spring Conference of the Korean Society of Mineral and Energy Resources Engineers, Abstracts, 65 (in Korean).

Kim, J., Seol, S., and Byun, J., 2025, Acoustic impedance extraction from 3D seismic data for CO₂ storage assessment in Yellow Sea, 124th Spring Conference of the Korean Society of Mineral and Energy Resources Engineers, Abstracts, 77 (in Korean).

Kim, K., Kang, M., Cheong, S., Kim, K., Song, I., and Kim, K., 2026, Comprehensive site screening and selection for offshore CO₂ storage in the Early Miocene formations of the eastern Gunsan Basin, Yellow Sea, Mar. Pet. Geol., 183, 107621.

10.1016/j.marpetgeo.2025.107621

Kim, Y., Lee, K., Jo, S., Kim, M., Kim, J. S., and Park, M. H., 2012, A preliminary evaluation on CO₂ storage capacity of the southwestern part of Ulleung Basin, offshore, East Sea, Econ. Environ. Geol., 45, 41-48 (in Korean with English abstract).

10.9719/EEG.2012.45.1.041

Kwon, Y. K. and Shinn, Y. J., 2018, Suggestion for technology development and commercialization strategy of CO₂ capture and storage in Korea, Econ. Environ. Geol., 51, 381-392 (in Korean with English abstract).

Lee, G., Seo, S. J., Byun, J., Choi, Y., Kim, S., and Kang, M., 2025, Case study: Machine learning–based vertical resolution enhancement of seismic data in Gunsan Basin, West Sea, 2025 Fall Joint Conference of KSMER–KSAM–KSEG–KSCE, Abstracts, 44 (in Korean).

MOTIE and MOF, 2021, Evaluation of Domestic CO₂Storage Capacity for CCS: 730 Million Tons, Expandable to 1.16 Billion Tons, Press Release, November 3, 2021. (in Korean)

Park, J. Y., Kim, J. M., and Yoon, S. H., 2015, Three dimensional geologic modeling of the Pohang Basin in Korea for geologic storage of carbon dioxide, J. Geol. Soc. Korea, 51, 289-302 (in Korean with English abstract).

10.14770/jgsk.2015.51.3.289

Pyrcz, M. J. and Deutsch, C. V., 2014, Geostatistical Reservoir Modeling, Oxford University Press.

Republic of Korea, 2021, 2050 Carbon Neutral Scenario, 2050 Carbon Neutrality Commission, October 18, 2021 (in Korean).

Shinn, Y. J., Lee, H. S., Lee, Y., Song, I., and Park, M. H., 2020, 3D grid based screening process for large-scale CO₂ geological storage in Gunsan Basin, Yellow Sea, Korea, Int. J. Greenh. Gas Control, 99, 103062.

10.1016/j.ijggc.2020.103062

Shinn, Y. J., Yoo, D. G., Hwang, S., Park, Y. C., and Huh, D. G., 2012, A preliminary screening of CO₂ geological storage in Ulleung Basin, Korea, J. Korean Soc. Miner. Energy Resour. Eng., 49, 47-58 (in Korean with English abstract).

Strebelle, S., 2002, Conditional simulation of complex geological structures using multiple-point statistics, Math. Geol., 34(1), 1-21.

10.1023/A:1014009426274

Information

Publisher :Korean Society of Earth and Exploration Geophysicists
Publisher(Ko) :한국지구물리물리탐사학회
Journal Title :Geophysics and Geophysical Exploration
Journal Title(Ko) :지구물리와 물리탐사
Volume : 29
No :1
Pages :76-86
Received Date : 2026-01-12
Revised Date : 2026-02-12
Accepted Date : 2026-02-23
DOI :https://doi.org/10.7582/GGE.2026.29.1.076

Geophysics and Geophysical Exploration ISSN:1229-1064(Print) 2384-051X(Online) 지구물리와 물리탐사

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