Seismic Source Signal Harmonic Distortion Reduction
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Solution Overview
Problem
Conventional seismic source generators produce signals with significant harmonic distortions due to their components, making it difficult to correlate the original source signal with the recorded data, which affects the accuracy of subsurface information obtained in seismic prospecting.
Innovation Solution
A method and apparatus that process and control seismic source signals using a feed-forward signal generated from parameters like hydraulic pressure, valve position, and electrical current to adjust and reduce harmonic distortions before the signal is imparted into the earth, utilizing a processor and controllers to minimize distortions caused by seismic source components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional seismic source components (hydraulic, mechanical, electromechanical subsystems) are used to generate seismic signals, then the seismic source signal can be produced, but harmonic distortions are generated that corrupt the signal quality
Solution Approach 1:
The patent measures the actual seismic source signal including distortions using a local sensor, then uses this measured signal (which contains the harmful distortions) as a reference in a correlation processor. The correlation processor uses this reference to identify and remove the distortion components from the recorded data, effectively converting the harmful distorted signal into a useful reference for correction.
Solution Approach 2:
The patent implements a feedback mechanism where the actual seismic source signal is measured by a local sensor and fed back to a correlation processor. This feedback loop allows the system to continuously monitor and correct for distortions by comparing the measured signal with the recorded data and applying appropriate corrections to remove harmonic distortions.
2Adaptability or versatility
If the original source signal distortion varies over time, then the seismic source can adapt to different operating conditions, but correlation processing becomes more difficult
Solution Approach 1:
The patent uses continuous feedback from a local sensor measuring the actual source signal to update the reference signal used in correlation processing. This feedback mechanism allows the system to automatically adapt to varying distortion characteristics without requiring manual recalibration, maintaining correlation accuracy despite changes in operating conditions.
Solution Approach 2:
The system performs self-correction by using its own measured distorted signal as the reference for correction. The correlation processor automatically identifies and removes distortion components without external intervention, allowing the system to self-adjust to varying operating conditions and maintain signal quality.
Data Source
AI summary
A seismic source signal generator having feed-forward control uses pressure, current, and/or valve position sensors to detect system component parameters. Initial and operating parameters are processed during source operation to remove, partially or wholly, harmonic distortions from the seismic source signal.