Attenuating noise in seismic data

摘要

Noise may be filtered or attenuated from seismic data by building a four-dimensional volume using the acquired seismic data and then applying a random noise attenuation filter to the four-dimensional volume. The dimensions of the four-dimensional volume may include a trace number dimension, a time dimension, a shot number dimension, and a cable number dimension. The random noise attenuation filter may filter portions of the acquired seismic data if the seismic data is not correlated with respect to other seismic data in the four dimensional volume.

主权项

1. A method for attenuating noise in seismic data that includes a plurality of seismic traces, comprising:
receiving the plurality of seismic traces, wherein respective seismic traces in the plurality of seismic traces were acquired using respective receivers during a seismic survey; forming a four-dimensional volume based at least in part on the plurality of seismic traces, the four-dimensional volume having:
respective trace numbers that correspond to the respective receivers as a first dimension;respective times at which the respective seismic traces were acquired as a second dimension;respective shot numbers that correspond to the respective seismic traces as a third dimension; respective cable numbers that correspond to the respective seismic traces as a fourth dimension; and applying, using a microprocessor, a noise attenuation filter to the four-dimensional volume, wherein applying the noise attenuation filter comprises:
comparing a seismic trace to an adjacent seismic trace in the four-dimensional volume, wherein the adjacent seismic trace is adjacent to the seismic trace with respect to time, cable number, or combinations thereof; and if a portion of the seismic trace is not substantially continuous with a portion of the adjacent seismic trace, attenuating the portion of the seismic trace.