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 geophysical exploration, comprising:
accessing a set of source time functions, a set of measured array data, and a subsurface attribute model, the subsurface attribute model defining a modeling grid; forward modeling the source time functions in the subsurface attribute model, including:
generating a set of modeled receiver array data from modeled arrays gathered from the modeling grid; anddifferencing the measured receiver array data from the modeled array data to obtain a data residual for each gathered, modeled array; back propagating the data residual into the subsurface attribute model to produce a modeled residual wavefield; and updating the subsurface attribute model using the modeled residual wavefield; and iterating updates to the surface attribute model to convergence.