Abstract

Fault detection is a very challenging problem on seismic interpretation. In fact, the process of fault detection contains seismic attribute extraction, seismic attribute enhancement and fault line detection. It is clear that the extracted seismic attributes are key to the fault detection process. Traditionally, as an important seismic attribute, the seismic coherence is generally employed in the fault detection process, but the size of the analysis window often effects the value of the seismic coherence, and there is a trade-off between the vertical resolution and the lateral resolution. In order to overcome this problem, we propose a new kind of seismic coherence with a mutative scale analysis window, and utilize it to locate the fault lines. It is demonstrated by the experimental results that our proposed seismic coherence is more suitable for the fault line detection in comparison with the traditional seismic coherence.

Highlights

  • For detecting the positions of energy resources under a specific ground, it is often necessary to collect and analyze the seismic data generated from a seismic exploration work which contains seismic data collection, seismic data processing and seismic interpretation

  • We propose a new kind of seismic coherency measure with mutative scale analysis window to avoid the shortness of the above seismic attributes

  • We have presented the new coherence which is the average of the variable scale semblance coherence and the variable scale eigenstrcture-based coherence, and we apply the Log-Gabor filter to improve the quality of our proposed seismic coherence

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Summary

Introduction

For detecting the positions of energy resources under a specific ground, it is often necessary to collect and analyze the seismic data generated from a seismic exploration work which contains seismic data collection, seismic data processing and seismic interpretation. Bahorich and Farmer [1] firstly introduced a classical normalized crosscorrelation to measure the continuity between neighboring windowed seismic traces, which was referred to as an attribute of coherence This original coherence is computed efficiently, but lacks the robustness for noisy seismic data. In order to overcome the drawbacks of the eigenstructurebased coherence, Cohen et al proposed two local discontinuity measure named seismic local structural entropy (LFE) [4] and normalized differential entropy (NDE) [5], respectively, being used to extract the faults These seismic attributes are dependent on the size of analysis windows which are selected by experience. We propose a new kind of seismic coherency measure with mutative scale analysis window to avoid the shortness of the above seismic attributes This new seismic coherence can be effectively used for fault detection.

Conventional Seismic Coherence
Semblance Coherence
Eigenstrcture-based Coherence
Proposed Seismic Coherence of Mutative Scale Analysis Window
Fault Detection Through the Proposed Coherence
Experimental Results
Conclusion
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