This discussion responds to the recent paper by Karolyté et al. (2020), in which strategies for the application of the shale gouge ratio (SGR) algorithm to fault seals in CO2 sequestration are discussed and outlined.

The authors propose that the observed hydrocarbon columns in the Katnook field in South Australia and the Boggy Creek field in Victoria are supported by fault rock seal. Fault rock seal (membrane seal) is thought to arise from a contiguous, fine-grained fault core, forming a capillary barrier for two non-miscible fluids (Yielding et al. 1997). The authors use the inferred...

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