Seismic Data Filter for Aliasing Attenuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional techniques are insufficient for attenuating aliasing in seismic data caused by detector spacing, particularly in the common shot domain with large offset data, leading to artifacts in geologic volume images.
Innovation Solution
A system and method that determines and applies a filter to seismic data to reduce or eliminate aliasing effects by modeling seismic energy as beams and using the midpoint dip and detector spacing to define the filter, thereby reducing artifacts in imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If detector spacing is used in seismic acquisition, then data acquisition is enabled, but aliasing occurs in the seismic data
Solution Approach 1:
The patent applies parameter changes by modifying the frequency content of the seismic data through filtering. Specifically, it changes the frequency parameters by removing high-frequency components that cause aliasing while preserving the useful signal information, thereby resolving the contradiction between data acquisition and measurement precision.
Solution Approach 2:
The patent introduces an intermediary approach by using a filtering operation as a mediator between the raw seismic data and the final processed data. This filter acts as an intermediary that processes the aliased data to eliminate unwanted frequency components, enabling accurate measurement despite the detector spacing limitations.
2Measurement precision
If conventional techniques are used to attenuate aliasing, then some aliasing reduction is achieved, but sufficient attenuation is not achieved in the common shot domain with large offset data
Solution Approach 1:
The patent applies local quality by implementing a filter that targets specific local characteristics of the aliased signal. The filter is designed to selectively attenuate high-frequency components that are locally present in the aliased data while preserving the broader signal characteristics, thereby achieving sufficient attenuation effectiveness.
Solution Approach 2:
The patent introduces dynamics by making the filtering process adaptive to the specific characteristics of the seismic data. The filter parameters are adjusted based on the data characteristics, allowing the system to dynamically optimize the aliasing attenuation for different datasets and conditions, thereby improving reliability.
3Object-affected harmful factors
If aliasing is present in seismic data, then imaging artifacts are introduced, but removing aliasing requires filtering that may affect data quality
Solution Approach 1:
The patent applies the blessing in disguise principle by converting the harmful aliasing effect into a beneficial filtering opportunity. Instead of simply removing aliasing, the patent uses the aliasing pattern itself as a guide to design a filter that selectively removes only the harmful high-frequency components while preserving the useful signal, thereby converting the harmful aliasing into a beneficial filtering criterion.
Solution Approach 2:
The patent uses parameter changes to differentiate between harmful and useful frequency content. By adjusting the filter parameters to target specific frequency ranges associated with aliasing, the system can change the spectral parameters of the data to remove artifacts while maintaining data quality, resolving the contradiction between artifact removal and data preservation.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Seismic data representing the propagation of seismic energy through a geologic volume of interest is processed. The seismic energy propagates through the geologic volume of interest from one or more source locations at or near the geologic volume of interest to one or more detector locations at or near the geologic volume of interest. In processing the seismic data, the seismic energy is modeled as beams (e.g., Gaussian beams). The processing includes determining a filter for the seismic data that attenuates aliasing which may be present in the seismic data due to spacing between detector locations.