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Method for determining continuous coherent belt of seismic signals

A determination method and seismic signal technology, applied in seismic signal processing and other directions, can solve problems such as high similarity, time cannot be calculated at a single point, and different signals, so as to improve the signal-to-noise ratio and assist oil and gas exploration

Active Publication Date: 2015-04-15
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, this method cannot be calculated at a single point in time, and requires a waveform duration length, which is relatively difficult in practice
Another problem is that there may be different bands with very high similarity, and the signals between different bands may also be different

Method used

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  • Method for determining continuous coherent belt of seismic signals
  • Method for determining continuous coherent belt of seismic signals

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Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the method for judging the seismic signal coherence zone of this specific embodiment includes the following steps:

[0028] Step 101: Input such as figure 1 For the seismic data shown, enter a symbol stack threshold of 3.

[0029] Step 102: At a certain time in the area of ​​the seismic signal receiving point, select a spatial window, in figure 1 In , the time point position is selected at the position of the maximum amplitude. Select 5 points for the spatial window width.

[0030] Step 103: Get the sign bit of the data, if the data value is greater than zero, take 1, if it is less than zero, take -1, if it is equal to zero, take 0. Such as figure 1 shown.

[0031] Step 104: Calculate the absolute value of the superposition result of the sign bit in the spatial window at the same time point. figure 1 The calculated result is 1.

[0032] Step 105: Determine whether the result of step 104 is greater than the threshold, if not, slide the...

Embodiment 2

[0039] and figure 1 The illustrated embodiment differs in that the figure 2 In the example, the sign bit of the first 10 channels of data and figure 1 in the same. The following 4 channels of data are added, the amplitude value is smaller than the previous sample point, and the sign bit is -1. This embodiment is a situation with multiple coherent segments.

[0040] In this embodiment, if there are multiple coherent segments, the energy in each coherent segment is calculated, and the one with the largest energy is selected as the finally selected coherent segment at the time point. Specifically, the superimposition result of the next 5 data sign bits is 3, which is the same as figure 1 The same as the coherent section in . However, the energy of this coherent segment is less than figure 1 coherent segment in . Therefore, the determined coherence band is the same as figure 1 Same as the shown embodiment.

[0041] In the above embodiments, the relationship between "coher...

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Abstract

The invention discloses a method for determining a continuous coherent belt of seismic signals. The method comprises the following steps of: inputting seismic data, and inputting a threshold value of coherent belt sign superposition; for a certain time sampling point, taking a first spatial point as a starting point of a space window; taking sign bits of the data, taking 1 when the data value is more than 0, taking -1 when the data value is less than 0, and taking 0 when the data value is equal to 0; calculating an absolute value of a sign bit superposition result in the space window at the same time point; and judging whether the result in the previous step is greater than the threshold value. By the method for determining the continuous coherent belt of the seismic signals, the seismic signals with high coherence can be selected to be analyzed; and therefore, a signal to noise ratio of the seismic signals is improved, and a function of assisting in exploring oil gas is realized.

Description

technical field [0001] The invention relates to a method for determining a continuous coherent band of a signal, in particular to a method for determining a continuous coherent band of a seismic signal. Background technique [0002] In seismic data processing, an operation often encountered is multi-channel data stacking. For example, in migration imaging, it is necessary to add multiple channels of migrated data together. In these stacking processes, it is hoped that the signal-to-noise ratio can be improved by stacking. In seismic data, there will be two adjacent seismic data very similar, and many similar, in-phase, and continuous data distribution ranges are called continuous coherence zones. The data summation energy in the continuous coherence band will be enhanced and the signal-to-noise ratio will be improved. The data outside the continuous coherence band will be weakened when superimposed together because the signal variation is not regular. Therefore, it is de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 王真理杨长春
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI