Utilization of Spectral Shaping Inversion Technology to Improve Reservoir Quality Prediction in a Mature Field, Nigerian National Petroleum Corporation / Mobil Producing Nigeria (NNPC/MPN) Joint Venture (JV) Acreage, Offshore Nigeria

Jerome J. Tsakma¹, Spyros Lazaratos², Roy David², Gianni Matteucci², Rex M. Prosser¹, and Raymond H. Young^1
1Production, Mobil Producing Nigeria, Lagos, Nigeria
²Exploration, ExxonMobil Exploration Company, Houston, TX

The subject field was discovered in 1967 with production start-up in 1970. A key development issue is the uncertainty in the reservoir characterization. Historically, reservoir characterization was based primarily on the interpretation of the environment of deposition as well as analysis of seismic attributes, calibrated to available well control. In an effort to further improve our ability to predict reservoir distribution, connectivity and quality in the field, Spectral Shaping Inversion was utilized to generate seismic-based relative porosity and Vshale volumes. Spectral Shaping Inversion represents a key improvement of the attribute-based methodology because it is based on robust rock property trends and utilizes the low-frequency seismic information, which is critical for accurate prediction of reservoir properties. As a result, significant imaging improvements were made at the Pliocene Base Qua Iboe (BQI) reservoir. This advanced our understanding of reservoir geometry and quality, and has enabled a more optimal placement of wells.

This study represents one of the first applications of Spectral Shaping technology in the NNPC/MPN JV acreage and establishes the feasibility of applying the method more widely in the area.

AAPG International Conference and Exhibition, Cape Town, South Africa 2008 © AAPG Search and Discovery