Fine lithologic reservoir characterization: a case study in the Pearl River Mouth Basin

Abstract

Lithologic reservoirs, characterized by the subtle location, small dimension and complex depositional architecture, have attracted much attention as a focus issue in petroleum exploration and development. Conventional structure and deposition interpretations based on seismic and logging data are very beneficial to the distribution forecast and formation analysis of lithologic reservoirs. But they are not enough to guide the remaining oil prediction of these reservoirs in the late stage of oil and gas development. Through years of study, a new fine characterization method on lithologic reservoirs is proposed. And four key techniques are involved, including the establishment of the depositional isochronous stratigraphic framework, dynamic analysis of the reservoir depositional evolution, fine anatomization of the reservoir architecture and comprehensive prediction of the remaining oil. This method has been successfully applied to a complex lithologic reservoir located at the XJ 24-1 Oilfield in the northern Pearl River Mouth Basin and verified by the later drilling results.