Chasing Not-so-Bright spots in the Lithic Glauc: Reservoir Sands or shale?
In this study, we investigate the phenomenon of similar amplitude anomalies resulting from different lithologies in the Lithic Glauconite. The Economic driver for the project was to improve confidence levels, and reduce risk in the identification of reservoir quality as measured by porosity and sand cleanliness. The discrimination of sand from shales within the Lithic system and from the Bantry shales which it can incise, became the objective. We accomplish this by investigating the relationship between elastic and petrophysical parameters using rock physics and ultimately, performing a rock physics inversion to directly estimate total porosity and clay content in our zone of interest. These seismic rock properties were then used to estimate reservoir quality by calculating zone specific effective porosities in the same manner done in petrophysical analysis.