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How to handle abnormal pressures in Nigeria's Niger Delta area

Journal Article · · Oil Gas J.; (United States)
OSTI ID:5103188
;
Overpressure data obtained from wells drilled in the Niger Delta were used in the preparation of a top of overpressure (TOPOVP) map of the Niger Delta. Depths to the top of overpressured interval in the Niger Delta range from 2,000 ft at the Calabar flank to 13,000 ft in an area extending from the central part of the western Niger Delta to the nose of the Niger Delta. Comparison of depth map of top of Akata formation and TOPOVP map shows that overpressures are normally encountered at depths shallower than top of Akata formation. Based on the findings of this study, the following conclusions are warranted: Geophysical well-logging measurements in the Niger Delta area show characteristics which permit delineation of the top overpressured zone. Majority of overpressures exist at depths between 6,000 ft and 13,000 ft in the Agbada formation. The distribution of overpressures in the Delta area shows well-defined trends with depths of top overpressure increasing towards the central part of the delta at a maximum depth of 13,000 ft. Comparison of TOPOVP trend map with depth to the Akata formation indicates that the TOPOVP encountered during drilling in the Niger Delta lies withing the Agbada formation and not the overpressured Akata formation.
Research Organization:
S.T. Schlumberger, Paris
OSTI ID:
5103188
Journal Information:
Oil Gas J.; (United States), Journal Name: Oil Gas J.; (United States) Vol. 83:10; ISSN OIGJA
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
AFRICA
COASTAL REGIONS
DEPTH
DEPTH 1-3 KM
DEPTH 3-6 KM
DEVELOPING COUNTRIES
DIMENSIONS
GEOLOGIC DEPOSITS
GEOPRESSURE ANOMALIES
MAPPING
MAPS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
NIGER RIVER
NIGERIA
OIL FIELDS
PETROLEUM DEPOSITS
RESERVOIR PRESSURE
RESOURCES
RIVER DELTAS
RIVERS
STREAMS
SURFACE WATERS
WELL LOGGING
WELL PRESSURE