--> Reservoir Contact Monitoring and Field Development Using Carbon/Oxygen Logging and Pressure Gradient Analysis - A Nigeria Offshore Case Study, by Parijat Mukerji, Oluwa Jide, and Peter Weinheber; #90037 (2005)

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Reservoir Contact Monitoring and Field Development Using Carbon/Oxygen Logging and Pressure Gradient Analysis - A Nigeria Offshore Case Study

Parijat Mukerji1, Oluwa Jide2, and Peter Weinheber3
1 Schlumberger Oilfield Services, Port-Harcourt, Nigeria
2 TOTAL, Port-Harcourt, Nigeria
3 Schlumberger Oilfield Services, Lagos, Nigeria

Reservoir contact monitoring and development using carbon/oxygen logging and pressure gradient analysis: Nigeria offshore field case study.

Carbon/oxygen logging in the Niger Delta complex-completions environment is carried out to monitor fluid contacts and estimate formation fluid saturations. The information obtained is utilized either to perform immediate remedial actions such as water shutoff and reperforations or to plan further field development. Formation testing and sampling techniques have evolved over time to accurately determine formation pressures, mobility, and permeability and to collect representative fluid samples.

The value of combining fluid contact information derived from a pressure gradient data technique with that determined from nuclear carbon/oxygen logging is demonstrated in a Nigerian offshore field development case study Carbon/oxygen logging was used in producing wells while the pressure gradient technique was employed in newly drilled injection wells. Good agreement is seen from both measurement techniques, and this has helped define fieldwide contacts and validate and update reservoir models for further field development.