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ADAPTIVE OPERATOR SIZE OF SEISMIC ATTRIBUTES FOR DETECTING FAULTS IN POST-STACK SEISMIC DATA BASED ON LOCAL FREQUENCY ANALYSIS

IP.com Disclosure Number: IPCOM000234968D
Publication Date: 2014-Feb-20
Document File: 8 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

[0003] Embodiments of the present disclosure may provide a method in which frequency analysis is used to determine the ideal operator size. To implement the method, software such as MATLAB® may be used. The method may use high frequencies to regulate the operator size for a pixel in the image through the use of frequency information of the pixel and a set of neighboring pixels. The method may thus include calculating a specific operator size for each pixel.

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Adaptive operator size of seismic attributes

for detecting faults in post-stack seismic data

based on local frequency analysis

Background

[0001]         Seismic attributes generally use a static operator size. The nature of seismic is that upon sending the sound waves, as depth increases frequency decreases. In addition to this, different regions have distinctive frequencies, such as chaotic areas have a high frequency despite the depth. By applying a frequency analysis of the sub-cube, an adaptive operative size can be used to further enhance the quality of the attributes.

[0002]         There has been little work related to adaptive filtering within seismic attributes in the past.  Aqrawi and Barka (Ahmed A. Aqrawi and David S. Barka. Enhanced Fault Segmentation using an Adaptive 3D Sobel Filter. AAPG annual meeting, 2013) developed an adaptive filter for enhancing fault segmentation. The method implemented was directly related to the nature of seismic.  There, the operator size is dependent on the depth (or time), by starting with an operator size and increasing it the further down the seismic data it goes. 

Summary

[0003]         Embodiments of the present disclosure may provide a method in which frequency analysis is used to determine the ideal operator size. To implement the method, software such as MATLAB® may be used.  The method may use high frequencies to regulate the operator size for a pixel in the image through the use of frequency information of the pixel and a set of neighboring pixels. The method may thus include calculating a specific operator size for each pixel.

Brief Description of the Drawings

[0004]         The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present teachings and together with the description, serve to explain the principles of the present teachings.  The patent or application file contains at least one drawing executed in color.  Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.  In the figures:

[0005]         Figure 1 illustrates two seismic images, according to an embodiment.

[0006]         Figure 2 illustrates a comparison of filtering techniques on a seismic image, according to an embodiment.

[0007]         Figure 3 illustrates the use of adaptive (c) and non-adaptive filtering (a) on an inline slice (b), according to an embodiment.

[0008]         Figure 4 illustrates a schematic view of a processor system, according to an embodiment.

Detailed Description

[0009]         The following detailed description refers to the accompanying drawings.  Wherever convenient, the same reference numbers are used in the drawings and the following description to refer to the same or similar parts.  While several embodiments and features of the present disclosure are described herein, modifications, adaptations, and other implementations are possible, without departing from the spirit and scope of t...