Integrated sedimentological and petrophysical rock typing of the Paleocene Farewell F sandstones: advancing sustainable solution for CO2 storage in Taranaki Basin, New Zealand
Yahia M. Szabó N.P. Radwan A.A. Leila M.
March 2026Elsevier Ltd
International Journal of Greenhouse Gas Control
2026#151
As the global demand for effective carbon mitigation strategies intensifies, geological CO₂ storage has emerged as a key solution for supporting decarbonization efforts. However, reservoir heterogeneity and improper rock typing models often limit the accuracy of storage capacity predictions and long-term CO2 injectivity assessments. This study addresses this gap by applying an integrated sedimentological, mineralogical and petrophysical rock typing analysis of the Farewell F Formation in the Maui Field, New Zealand with regional relevance for subsurface CO₂ storage. Maui Field in the Taranaki Basin hosts extensive, largely depleted gas-bearing reservoirs that represent promising candidates for long-term geological CO₂ storage. However, the storage potential of the Maui reservoir intervals remains insufficiently constrained. Farewell F consists mainly of mounded and onlapping wedge seismic facies corresponding to a prograding fluvio-deltaic sandstones. Mineralogically, Farewell F sandstone is classified as glauconitic, and argillaceous arkose arenite with heterogeneous porosity and permeability. Farewell F succession is subdivided into three distinct reservoir rock types (RRT1–RRT3). RRT1 demonstrates optimal storage properties with porosity exceeding 15%, permeability ranging from 100 to 500 mD, and favorable capillary behavior, while RRT2 and RRT3 show tighter pore networks and higher capillary entry pressures, functioning as internal baffles and potential mineral trapping zones. The present results reveal a vertically organized architecture, offering a self-contained and stratigraphically governed storage system. Additionally, the glauconitic composition of Farewell sandstones may offer additional CO2 storage capacity through mineral trapping. These findings underscore the potential of the Farewell Formation to support both physical and geochemical trapping mechanisms.
Farewell formation , Geological storage of CO2 , New Zealand , Reservoir quality , Reservoir rock types , Taranaki basin
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Geology Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt
Institute of Exploration Geosciences, Faculty of Earth and Environmental Sciences and Engineering, University of Miskolc, Miskolc-Egyetemváros, 3515, Hungary
Department of Geology, Faculty of Science, Al-Azhar University, Assiut Branch, Assiut, 71524, Egypt
School of Mining and Geosciences, Nazarbayev University, Astana, 010000, Kazakhstan
Geology Department
Institute of Exploration Geosciences
Department of Geology
School of Mining and Geosciences
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