System and method for determining a frequency sweep for seismic analysis

摘要

A sweep generator is employed to generate a sweep to be used by a seismic vibrator device for generating a desired target output spectrum, wherein the frequency sweep is designed so as to comply with one or more constraints imposed by the seismic vibrator device and/or imposed by the environment in which the device is to be used. In one embodiment, a sweep generator determines a sweep for achieving a desired target output spectrum by a given seismic vibrator device in compliance with at least a pump flow constraint imposed by the seismic vibrator device. In another embodiment, a sweep generator determines a sweep for achieving a desired target output spectrum by a given seismic vibrator device in compliance with all of multiple operational constraints of the seismic vibrator device, such as both mass displacement and pump flow constraints. Environmental constraints may also be accounted for in certain embodiments.

主权项

1. A method for generating a target output spectrum for use in seismic exploration to be achieved by a hydraulic seismic vibrator device, the method comprising:
receiving constraint information related to the hydraulic seismic vibrator device; using a mathematical relationship for achieving the target output spectrum, wherein the mathematical relationship relates the (i) the constraint information of the hydraulic seismic vibrator device, (ii) the target output spectrum, and (iii) a frequency sweep rate; determining in a processor-based device, based on the mathematical relationship, a frequency sweep for achieving the target output spectrum by the hydraulic seismic vibrator device in compliance with the constraint information of the hydraulic seismic vibrator device; and employing said determined frequency sweep by said hydraulic seismic vibrator device for generating said target output spectrum, wherein, in the mathematical relationship, the frequency sweep rate is directly proportional to a force constraint at a predetermined power, the force constraint being related to the constraint information, and inversely proportional to the target output spectrum at the predetermined power.