(147b) Planning the First South African Pilot CO2 Storage Project
The PTAS1 team has performed extensive characterization analyses of the available 1960âs-1970âs subsurface data in the Zululand basin. While interpretation of existing 2D seismic, aeromagnetic, well log, and core data supplemented by new sampling of the legacy core and new sequence-stratigraphic interpretations has greatly increased the geologic understanding of the basin, the analyses indicate that the legacy data are insufficient to confidently site an injection well. Uncertainties remain regarding the petrophysical properties, architecture, behavior, and storage capacity of reservoirs and seals. To reduce these uncertainties, an exploration plan was developed to guide the acquisition of new data for the project. The exploration plan is designed to fill the data gaps and provide new data necessary for characterizing potential pilot CO2 storage sites. Basin exploration activities include acquiring new, high-resolution aeromagnetic data, acquisition of nearly 300km of new, high-quality three-component seismic data, and the drilling of two new slim-hole characterization wells with complete coring and modern wireline logging. In parallel with field characterization planning, initial static and dynamic models are being prepared to evaluate the likely injectivity, capacity, and containment of CO2 and to assist with project design.
The implementation of these exploration activities will result in new geophysical, petrophysical, geomechanical, and engineering data required for (1) the construction and population of static and dynamic earth models, (2) play identification and assessment and (3) ranking and risk analysis of play fairways and prospect leads. This will ultimately allow for selection of an appropriate location for drilling of the injection and monitoring wells for the pilot CO2 storage project. This paper will present results of the data review, analysis, and initial modeling, along with the path forward to select the first CCS pilot test location in South Africa.