Azimuth-Dip Angle Gathers for Diffracted Wave Imaging
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Solution Overview
Problem
Current seismic exploration methods face challenges in accurately separating and imaging diffracted waves from reflected waves, particularly due to their weak energy and interference, leading to poor imaging accuracy and inability to distinguish between types of diffracted waves.
Innovation Solution
A method and device utilizing azimuth-dip angle gathers to detect and image diffracted waves by generating target azimuth-dip angle gathers, determining the type of diffracted waves, and applying specific imaging techniques to improve resolution, allowing for three-dimensional separation and identification of tip and edge diffracted waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dip-angle gathers are used to separate diffracted and reflected waves, then the separation effectiveness is improved, but the ability to distinguish between different types of diffracted waves is lost
Solution Approach 1:
The patent transitions from two-dimensional dip-angle gathers to three-dimensional azimuth-dip angle gathers by introducing the azimuth dimension. This dimensional expansion enables simultaneous preservation of separation effectiveness and diffracted wave type distinction, as different azimuth angles provide complementary information about the spatial characteristics of diffracted waves from different geological features.
Solution Approach 2:
The patent segments the seismic data processing into multiple azimuth angle components, analyzing diffracted waves at different azimuth angles separately. This segmentation allows identification of diffracted wave types based on their azimuthal distribution patterns while maintaining the separation effectiveness achieved through dip-angle filtering.
2Measurement precision
If signal analysis methods such as dip filtering or Radon filtering are applied to pre-stack data, then diffracted waves can be separated, but correct separation becomes very difficult when diffracted and reflected waves interfere with each other
Solution Approach 1:
The patent introduces azimuth-dip angle gathers as an intermediary representation that transforms the complex interference pattern between diffracted and reflected waves into a more separable form. By organizing data in the azimuth-dip angle domain, the method creates an intermediate stage where filtering operations can more effectively distinguish between wave types even under strong interference conditions.
Solution Approach 2:
The patent changes the parameter space from conventional time-offset domain to azimuth-dip angle domain. This parameter transformation converts the interference problem into a different representation where diffracted and reflected waves exhibit distinct characteristics, enabling more reliable separation through filtering operations in the transformed domain.
3Device complexity
If conventional two-dimensional dip-angle gather methods are used, then processing complexity is reduced, but the methods fail to distinguish between common important types of diffracted waves
Solution Approach 1:
The patent adds the azimuth dimension to the conventional two-dimensional dip-angle gather approach, creating three-dimensional azimuth-dip angle gathers. This dimensional enhancement enables classification of diffracted wave types based on their azimuthal characteristics while maintaining a systematic and organized processing framework that manages complexity through structured data organization.
Solution Approach 2:
The patent creates a multi-functional processing system where the three-dimensional azimuth-dip angle gather framework simultaneously achieves multiple objectives: separation of diffracted and reflected waves, classification of diffracted wave types, and imaging of subsurface structures. This universal framework handles multiple tasks within a unified processing paradigm.
Data Source
AI summary
The present disclosure provides a method and a device for imaging diffracted waves based on azimuth-dip angle gathers and a storage medium, which relates to the technical field of seismic exploration, comprising firstly acquiring seismic data and generating target azimuth-dip angle gathers based on the seismic data, wherein the target azimuth-dip angle gathers are a set of all azimuth-dip angle gathers in which the Fresnel zones have been muted, and each of the azimuth-dip angle gathers represents a dip-angle gather corresponding to each azimuth angle; then detecting diffracted waves based on the target azimuth-dip angle gathers, and determining the type of the diffracted waves; and finally, imaging the diffracted waves based on the type of the diffracted waves to obtain a diffracted wave imaging result.