Method for correcting impulse response differences of hydrophones and geophones as well as geophone coupling to the water-bottom in dual-sensor, bottom-cable seismic operations

Patent · Tue Aug 10 04:00:00 EDT 1993

OSTI ID:6027495

Barr, F J; Sanders, J L

A method is described of calibrating a geophone/hydrophone receiver pair used in a marine environment for marine bottom testing, said method comprising the steps of: deploying said geophone/hydrophone receiver pair in said marine environment on said marine bottom; generating a primary seismic wave into said marine environment, said primary seismic wave traveling generally downwardly in said marine environment toward said marine bottom, and said primary seismic wave resulting in reflected seismic waves being generated in response to the primary seismic wave encountering interfaces, said hydrophone detecting water pressure resulting from receiving said primary and reflected seismic waves, and generating a first signal correlative to said detected pressure, and said geophone detecting water velocity resulting from receiving said primary and reflected seismic waves, and generating a second signal correlative to said detected velocity; reversing polarity of said second signal and delivering a repolarized second signal; determining an angle of incidence at which said primary seismic wave strikes said geophone; adjusting said repolarized second signal to correct for said determined angle of incidence if said determined angle of incidence is greater than zero degrees; isolating portions of said first signal and of said repolarized second signal that correspond to said primary seismic wave; transforming said isolated first signal and said isolated repolarized second signal into first and second frequency domain signals, respectively; dividing one of said first and second frequency domain signals by the other of said first and second frequency domain signals to obtain a filter transfer function; transforming said filter transfer function into a time domain filter; and applying said time domain filter to one of said first and second signals generated as a result of subsequent seismic waves.

• Assignee: Halliburton Geophysical Services, Inc., Sugar Land, TX (United States)
• Patent Number(s): A; US 5235554
• Application Number: PPN: US 7-849998
• OSTI ID: 6027495
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
CALCULATION METHODS
CALIBRATION
DATA ANALYSIS
DEPTH
DIMENSIONS
GEOPHYSICAL SURVEYS
HYDROGEN COMPOUNDS
INCIDENCE ANGLE
MEASURING INSTRUMENTS
OXYGEN COMPOUNDS
PRESSURE MEASUREMENT
SEA BED
SEAWATER
SEISMIC ARRAYS
SEISMIC DETECTORS
SEISMIC SURVEYS
SEISMIC WAVES
SURVEYS
WATER