Formation pressure prediction with seismic data from the Gulf of Mexico
- Halliburton Geophysical Services Inc. (US)
- Stanford Univ., CA (United States)
In this paper, the authors derive seismic formation-pressure logs using seismic data from offshore Louisiana to delineate the distribution of overpressured zones in the subsurface. The seismic-data processing consists of velocity modeling, wavelet processing, and seismic inversion. From the acoustic impedances produced by seismic inversion, the authors derive seismic velocity and density logs at every seismic tracer location using a relationship between sonic velocities and acoustic impedances. The authors use these logs to compute the seismic formation-pressure logs vs. depth. Formation-pressure logs are calculated with the assumption that compressional velocity, means density, and depth are proportional to formation pressure. These logs are constrained at every depth by estimated matrix and fluid compressional velocities (v{sub max} and v{sub min}). v{sup max} and v{sub min} are derived from porosity and sonic well-log information. Results include profiles of seismic-velocity, seismic-density, and formation-pressure logs for two intersecting seismic lines from offshore Louisiana. Log from one well are used to constrain the data processing. The seismic formation-pressure sections delineate a large region of overpressured shales in the subsurface.
- OSTI ID:
- 5739991
- Journal Information:
- SPE Formation Evaluation (Society of Petroleum Engineers); (United States), Vol. 6:1; ISSN 0885-923X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
47 OTHER INSTRUMENTATION
GULF OF MEXICO
SEISMIC SURVEYS
WELL DRILLING
OIL FIELDS
PRESSURE MEASUREMENT
ACOUSTIC TESTING
DATA PROCESSING
LOUISIANA
OFFSHORE OPERATIONS
POROSITY
RESERVOIR PRESSURE
SEISMIC WAVES
VELOCITY
WELL LOGGING
ATLANTIC OCEAN
CARIBBEAN SEA
DEVELOPED COUNTRIES
DRILLING
FEDERAL REGION VI
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
MATERIALS TESTING
MINERAL RESOURCES
NONDESTRUCTIVE TESTING
NORTH AMERICA
PETROLEUM DEPOSITS
PROCESSING
RESOURCES
SEAS
SURFACE WATERS
SURVEYS
TESTING
USA
020200* - Petroleum- Reserves
Geology
& Exploration
440700 - Geophysical & Meteorological Instrumentation- (1990-)
440400 - Well Logging Instrumentation