Paper Summary
Screening, identifying, and characterizing a CCS site is of paramount importance as the sector faces considerable challenges in delivering sufficient capture and storage capacity to meet stated targets. With the urgency to develop more sites, there is a need to effectively evaluate the storage capacity and confirm future monitorability. This paper will demonstrate recent results in the Southern Gas Basin in the UKCS. We will show how an interactive rock physics analysis has been developed over a selection of key wells in the area and demonstrate its application in the evaluation of seismic sensitivity to CO2 injection. In saline aquifer storage sites, CO2 is injected in dense phase as a supercritical fluid. As a CO2 is not gas at subsurface conditions, it will interact differently with the rock frame and specific attention is required in the way the rock physics model is built and calibrated. The presented tool is designed to enable geoscientist to interactively assess any reservoir property perturbations and their subsequent effect on the seismic response and an early assessment of potential monitoring feasibility. This workflow is relevant as part of a suite of approaches suitable for monitoring, measurement, and verification (MMV) approaches to be evaluated.