Improved Lithological and Fluid Prediction via Integration of Comprehensive Regional Based Rock Physics in Classifying Seismic

In quantitative seismic interpretation Rock Physics plays a major role to establish a link between seismic responses and reservoir properties including lithology, pore pressure, and pore fluid. However, characterising and predicting these reservoir properties in complex geological settings poses a significant challenge for many geoscientists. Hence, we have developed a method that incorporates an advanced regional rock physics template (RPT) into classifying seismic elastic properties which takes into consideration the variation of the mineralogy, deviation in subsurface pore pressure and temperature with depth, subsurface pore fluid type and saturation. The effectiveness of this method was tested on a field located in the Moattama Basin, whereby the target reservoir is an anticlinal structure, bounded by multiple faults. Upon application on ten blind wells located within a 5 kilometer radius, the average precision and recall (accuracy) was approximately 90% and 80% respectively. Thus, the method successfully achieves a better precision and accuracy in predicting the lithology as well as the fluid even though the area does not have ample data for detailed rock physics analysis. This opens up opportunities for application in frontier Exploration and Development areas to further increase the probability of success (POS).