A feasibility study to assess seismic detectability of CO2 sequestration in Gandhar Oilfield, Cambay basin: India’s first CO2 Project

Zia, Saqib; White, James C; Vosper, Hayley; Vedanti, Nimisha; Anthony, Emmanuel; Ahmed, Shaik Nasif. 2023 A feasibility study to assess seismic detectability of CO2 sequestration in Gandhar Oilfield, Cambay basin: India’s first CO2 Project. [Poster] In: W-9: Insights and Questions Related to CCUS and Reservoir Characterization Utility in Terms of Static Earth Model Description Based on Geophysical Methods, a post-convention workshop, Houston, Texas, 01 Sep 2023. (Unpublished)

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Abstract/Summary

The Gandhar oilfield is one of the major hydrocarbon fields of the Cambay Basin and a pilot candidate for India’s first large-scale CO2 injection project. The feasibility of seismic data to monitor CO2 sequestration in the Ardol Member of the Ankleshwar Formation is demonstrated through synthetic seismic modeling. The evolution of an expanding CO2 plume was calculated through the analytical approximation of axisymmetric gravity currents in a brine-CO2-saturated medium. CO2-saturated rock properties were determined using Gassmann fluid substitution. Seismic modeling was carried out for both pre-CO2 and post-CO2 injection models to determine the potential value of time-lapse seismic monitoring. It was observed that the CO2-saturated layers were readily detected, and seismic data would provide a suitable monitoring tool for a future CO2 storage complex. We anticipate that monitoring of CO2 sequestration on synthetic seismogram by poroviscoelastic theory will be more enhanced due to realistic amplitude attenuation attributed to interplay of squirt-flow (viscoelasticity) and Biot-flow (poroelasticity) mechanisms associated with matrix-fluid coupling relaxation. In addition to Hazad Sands (reservoir), brine-saturated Ardol Sands is studied for the possibility of CO2 sequestration. The enhanced impedance contrast between CO2 saturated Ardol Sand sand layers below it brightens the amplitude of the underburden. If the injection point is on the top of Ardol Sands, we see that it is easier to detect the CO2 saturated layer. Detection threshold is obtained for 30 days since CO2 injection in Ardol sands.

Item Type:	Publication - Conference Item (Poster)
Additional Keywords:	IGRD
Date made live:	18 Dec 2023 12:10 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/536481

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