Method for handling rough sea and irregular recording conditions in multi-sensor towed streamer data
AssigneePGS Geophysical AS
InventorNaide Pan
Life of this patent
Estimating the term…
Abstract
Rough sea elevation is estimated from a high-frequency portion of recorded pressure data and recorded vertical velocity component data. Generalized deghosting and datuming operators are constructed, which take into account the estimated rough sea elevation and irregular recording depth conditions. A low-frequency portion of the recorded pressure data is decomposed into up-going and down-going wavefields on a horizontal reference plane, using the generalized datuming and deghosting operators. A low-frequency portion of the vertical velocity component data is reconstructed from the decomposed up-going and down-going wavefields on the horizontal reference plane, using the generalized datuming and deghosting operators.
Claims24
A method for reconstructing low-frequency vertical velocity component data under rough sea and irregular recording depth conditions, comprising:
- using a programmable computer to perform the following:
- estimating rough sea elevation from a high-frequency portion of recorded pressure data and recorded vertical velocity component data;
- constructing generalized deghosting and datuming operators, which take into account the estimated rough sea elevation and irregular recording depth conditions;
- decomposing a low-frequency portion of the recorded pressure into up-going and down-going wavefields on a horizontal reference plane, using the generalized datuming and deghosting operators;
- and
- reconstructing a low-frequency portion of the vertical velocity component data from the decomposed up-going and down-going wavefields on the horizontal reference plane, using the generalized datuming and deghosting operators.
At least one non-transitory computer readable medium with a computer program stored thereon, the program having logic operable to cause at least one programmable computer to perform a method comprising:
- estimating rough sea elevation from a high-frequency portion of recorded pressure data and recorded vertical velocity component data;
- constructing generalized deghosting and datuming operators, which take into account the estimated rough sea elevation and irregular recording depth conditions;
- decomposing a low-frequency portion of the recorded pressure into up-going and down-going wavefields on a horizontal reference plane, using the generalized datuming and deghosting operators;
- and
- reconstructing a low-frequency portion of the vertical velocity component data from the decomposed up-going and down-going wavefields on the horizontal reference plane, using the generalized datuming and deghosting operators.
A method for geophysical prospecting, comprising:
- disposing a multi-sensor streamer in a body of water;
- responsive to signals recorded at pressure sensors and vertical velocity component sensors in the multi-sensor streamer, calculating pressure traces and vertical velocity component traces, respectively, representing physical reflected wavefields in the body of water incident on the streamer;
- reconstructing low-frequency vertical velocity component data under rough sea and irregular recording depth conditions by transforming the pressure and vertical velocity component traces to produce pressure traces representing low-frequency vertical velocity component traces as they would appear if incident on the streamer, the transforming comprising:
- estimating rough sea elevation from a high-frequency portion of recorded pressure traces and recorded vertical velocity component traces;
- constructing generalized deghosting and datuming operators, which take into account the estimated rough sea elevation and irregular recording depth conditions;
- decomposing a low-frequency portion of the pressure traces into up-going and down-going traces on a horizontal reference plane, using the generalized datuming and deghosting operators;
- and
- reconstructing a low-frequency portion of the vertical velocity component traces from the decomposed up-going and down-going traces on the horizontal reference plane, using the generalized datuming and deghosting operators;
- and
- recording the low-frequency vertical velocity component traces.
Dependencies are inferred from the claim text.