ABSTRACT

We have developed a feasibility study on the application of time-lapse gravity as a monitoring tool for a proposed CO2 sequestration test site. The results are a component of a larger geotechnical suitability study to evaluate a specific field’s potential for CO2 storage and to evaluate viable techniques for effective monitoring there. The reservoir model for this study was constructed from detailed reservoir data available through separate reservoir characterization studies of the field. The gravity inversion used was a highly constrained binary approach that incorporated reservoir geometry from seismic data and the internal 3D distributions of density change predicted from the reservoir engineering database. Incorporating borehole data for joint surface/borehole monitoring further improved the potential of time-lapse gravity to define CO2 movement during sequestration. In this paper, we present a subset of the entire study. Our results indicate that the site likely has a favorable combination of geometry, depth, thickness, and predicted density change from CO2 movement to be effectively monitored with surface time-lapse gravity.

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