| 摘要 |
A method for eliminating ghosts, or reflections from the air/water interface of a body of water, from seismic signals detected at a predetermined depth is provided. The method employs both a pressure sensor and a motion sensor. A seismic signal and its corresponding ghost signal detected by a pressure sensor is filtered as a function of depth of the sensor to provide a preselected amplitude and zero phase shifted band-limited spike signal at an arrival time corresponding to the arrival time midway between the seismic and ghost arrival times. Similarly, a seismic and ghost signal from a motion sensor is filtered as a function of depth of the sensor to provide a band-limited spike having an arrival time midway between the seismic and ghost arrival times. The filtered motion and pressure spikes are added together in proportion to their respective signal-to-noise ratios. The proportionally added signal is a ghost free seismic signal having a maximum signal-to-noise ratio for each frequency component and may be employed in further seismic processing steps.
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