ABSTRACT

Seismic monitoring has been successful in monitoring of large injections (millions of tonnes) of CO into the subsurface for several production-scale carbon capture and storage (CCS) projects (Chadwick et al., 2009, Ringrose et al., 2013). Pilot small-scale projects are required to investigate different aspects of CO geosequestration. The purpose of our study is to check the lower limits of CO amounts detectable by a meaningfully designed surface seismic monitoring program. An onshore 4D seismic experiment is performed with the aim of monitoring of a small scale borehole injection of supercritical CO into a saline aquifer at 1.5 km depth. The injection is done by CO2CRC in the framework of Stage 2C of Otway project in early 2016. The operations take place in Australian state Victoria. To increase signal to noise ratio and repeatability, a receiver array is installed at 4 m depth under the surface. The acquired time-lapse data is processed using model-guided approach. The final time-lapse seismic images show that an injection as small as 5,000 tonnes can be confidently detected via seismic monitoring from surface.

Presentation Date: Thursday, September 28, 2017

Start Time: 11:00 AM

Location: 351F

Presentation Type: ORAL

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