Seismic Shot Interval Control for Frequency-Dependent Aliasing
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Solution Overview
Problem
In seismic surveying, the separation of successive seismic source activations can lead to aliasing, causing inaccuracies in data processing and characterization of subsurface structures due to insufficient control over the shot interval based on the frequency output of frequency-controllable sources.
Innovation Solution
The shot interval between seismic source activations is determined based on constraints that account for the expected frequency of the seismic sources, including the tow speed, reverberation decay time, two-way time, and the speed of sound, to minimize aliasing and ensure accurate data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the shot interval between seismic source activations is increased to improve survey efficiency, then productivity increases, but aliasing occurs causing measurement precision to deteriorate
Solution Approach 1:
The patent applies dynamics by making the shot interval variable rather than fixed. The shot interval is dynamically adjusted based on the operating frequency of the seismic source, allowing the system to adapt to different survey conditions. This resolves the contradiction by enabling longer intervals (higher productivity) when frequencies are low, and shorter intervals (higher precision) when frequencies are high, thus optimizing both productivity and measurement precision across varying operational parameters.
Solution Approach 2:
The patent changes the parameter of shot interval based on the frequency parameter of the seismic source. By establishing a relationship where shot interval is determined by frequency constraints, the system can modify the time parameter according to the frequency parameter, thereby preventing aliasing while maintaining survey efficiency. This parameter coupling resolves the contradiction by making the shot interval responsive to the actual operating conditions.
2Ease of operation
If the shot interval is fixed to simplify operation, then ease of operation improves, but adaptability to different frequency outputs deteriorates
Solution Approach 1:
The patent implements self-service by enabling the shot interval determination system to automatically select appropriate intervals based on the seismic source's operating frequency. Rather than requiring manual adjustment for different frequencies, the system autonomously adapts the shot interval according to frequency constraints, thereby maintaining ease of operation while achieving adaptability to different frequency outputs.
Solution Approach 2:
The patent employs feedback by using the operating frequency information of the seismic source to determine the shot interval. The system receives feedback about the current frequency output and automatically adjusts the shot interval accordingly, ensuring adaptability to different frequency conditions while maintaining operational simplicity through automated control.
Data Source
AI summary
A shot interval between activations of at least one frequency-controllable survey source is determined, where the shot interval is determined based on an expected frequency of an output of the at least one frequency-controllable survey source. The at least one frequency-controllable survey source is activated using the determined first shot interval.