Noise filtering method for seismic data
AssigneeSchlumberger Technology Corporation
InventorAli Ozbek
Life of this patent
Estimating the term…
Abstract
A method for filtering noise from discrete noisy seismic signals in a time interval ([1, . . . , T]) is provided. The method comprising the steps of using the noisy seismic signals for determining at least one reference channel (x(t)) for the time interval as an estimate of the noise; determining coefficients for M temporally local filters (w(i, t)), the filters forming a filter bank, and M being a number equal to or larger than two, by minimizing a cost function (J(t)) representing a measure of the error of the output of the filter bank, and applying the filter bank to at least one estimate (x(t)) to determine M filtered estimates of the noise. The filtered estimates are multipled with temporal windows (h(i, t)).
Claims17
A method for filtering noise from discrete noisy seismic signals in a time interval ((1, . . . , T)) said method comprising the steps of
- using said noisy seismic signals for determining at least one reference channel (x(t)) for said time interval as an estimate of said noise;
- determining coefficients for M temporally local filters (w(i,t)), said filters forming a filter bank, and M being a number equal to or larger than two, by minimizing a cost function (J(t)) representing a measure of the error of the output of said filter bank;
- and
- applying said filter bank to said at least one estimate (x(t)) to determine M filtered estimates of said noise.
Dependencies are inferred from the claim text.