Patent ID: 7929380
Filing Date: 2011-04-19
Classification: G01V

Abstract:
1. A seismic signal generation method, comprising: generating a primary control signal for controlling a controllable valve of a seismic source, the primary control signal operating the controllable valve, the controllable valve controlling hydraulic pressure for a hydraulic actuator of the seismic source, the hydraulic actuator generating a seismic signal; obtaining initial parameters at the controllable valve in advance of operation of the seismic source by determining a plurality of pressure values from a plurality of pressure sensors at the controllable valve; generating a feed-forward signal by processing the initial parameters obtained; adjusting the primary control signal for the controllable valve with the feed-forward signal; and generating a seismic signal with the seismic source having at least partially removed harmonic distortion by operating the controllable valve with the adjusted control signal.