Lithology and fluid differentiation using a rock physics template

Abstract

The elastic properties such as velocity, density, impedance, and VP/VS ratio take an important role in reservoir characterization because they are related to the reservoir properties. To analyze these elastic properties, rock physics knowledge is a bridge that links the elastic properties to the reservoir properties such as water saturation, porosity, and shale volume. In this study, we build up a rock physics template and plot it along with the inverted elastic properties to aid the efficient interpretation. Using this method, we can estimate the lithology and fluid content of undrilled areas if the undrilled area has the same geological deposition environment as a drilled area. The final results show that the lithology and fluid content can be efficiently interpreted for our target reservoirs using the inverted elastic properties plotted with a rock physics template, rather than only using the inverted elastic properties.