SEISMIC ACQUISITION METHOD AND APPARATUS

摘要

The presently disclosed seismic acquisition technique employs a receiver array and a processing methodology that are designed to attenuate the naturally occurring seismic background noise recorded along with the seismic data during the acquisition. The approach leverages the knowledge that naturally occurring seismic background noise moves with a slower phase velocity than the seismic signals used for imaging and inversion and, in some embodiments, may arrive from particular preferred directions. The disclosed technique comprises two steps: 1) determining from the naturally occurring seismic background noise in the preliminary seismic data a range of phase velocities and amplitudes that contain primarily noise and the degree to which that noise needs to be attenuated, and 2) designing an acquisition and processing method to attenuate that noise relative to the desired signal.

主权项

1. A computer-implemented method for use in seismic surveying, comprising:
accessing a set of preliminary seismic data; determining from the naturally occurring seismic background noise in the preliminary seismic data a range of phase velocities over which the noise is at an amplitude relative to the desirable signal such that the noise requires attenuation, and the degree to which that noise needs to be attenuated; and designing a low-frequency seismic survey of the survey area, the survey design including:
a seismic receiver array in which the receivers are positioned so as to filter the naturally occurring seismic background noise; anda seismic source shooting plan; wherein the accessing, determining, and designing are performed with a computing apparatus.