3D Static Modeling and CO2 Static Storage Estimation of the Hydrocarbon-Depleted Charis Reservoir, Bredasdorp Basin, South Africa

Blessing Ayotomiwa Afolayan*, Eric Mackay, Mimonitu Opuwari

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
126 Downloads (Pure)

Abstract

An essential greenhouse gas effect mitigation technology is carbon capture, utilization and storage, with carbon dioxide (CO2) injection into underground geological formations as a core of carbon sequestration. Developing a robust 3D static model of the formation of interest for CO2 storage is paramount to deduce its facies changes and petrophysical properties. This study investigates a depleted oilfield reservoir within the Bredasdorp Basin, offshore South Africa. It is a sandstone reservoir with effective porosity mean of 13.92% and dominant permeability values of 100–560 mD (1 mD = 9.869233 × 10–16 m2). The petrophysical properties are facies controlled, as the southwestern area with siltstone and shale facies has reduced porosity and permeability. The volume of shale model shows that the reservoir is composed of clean sands, and water saturation is 10–90%, hence suitable for CO2 storage based on petrophysical characteristics. Static storage capacity of the reservoir as virgin aquifer and virgin oilfield estimates sequestration of 0.71 Mt (million tons) and 1.62 Mt of CO2, respectively. Sensitivity studies showed reservoir depletion at bubble point pressure increased storage capacity more than twice the depletion at initial reservoir pressure. Reservoir pressure below bubble point with the presence of gas cap also increased storage capacity markedly.

Original languageEnglish
Pages (from-to)1021-1045
Number of pages25
JournalNatural Resources Research
Volume32
Issue number3
Early online date17 Mar 2023
DOIs
Publication statusPublished - Jun 2023

Keywords

  • 3D static model
  • Bredasdorp basin
  • Facies
  • Petrophysical properties
  • Sensitivity studies
  • Static storage capacity

ASJC Scopus subject areas

  • Environmental Science(all)

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