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Method for Eliminating Strong Reflection Amplitude of Seismic Marker Layer Based on Empirical Mode Decomposition

An empirical mode decomposition and marking layer technology, applied in the field of petroleum geophysical exploration, can solve the problems of distortion, unable to reflect the real situation of the underground medium, low calculation efficiency, etc., to achieve instantaneous attribute enhancement, enhanced oil and gas response characteristics, and fast calculation speed Effect

Active Publication Date: 2017-10-17
PETROCHINA CO LTD
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Problems solved by technology

Spectral decomposition technology and matching tracking technology are used to eliminate strong reflections of coal seams mainly for 3D seismic data, using the low-frequency characteristics of coal seam reflections to estimate the reflection data volume of coal seams and then reduce the strong reflection energy. The calculation process is relatively cumbersome.
Inverse Q filtering is a technology to compensate for the attenuation effect of the earth's absorption. Its purpose is to eliminate the amplitude attenuation and phase distortion of seismic waves during propagation; the current high-efficiency inverse Q filtering methods all assume that the underground medium is a constant Q or layered Q model, which does not reflect the real situation of the underground medium; and the inverse Q filtering method, which assumes that Q changes continuously with time or depth, is close to the real situation of the underground medium, but because of the use of integral, the calculation efficiency is low

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  • Method for Eliminating Strong Reflection Amplitude of Seismic Marker Layer Based on Empirical Mode Decomposition
  • Method for Eliminating Strong Reflection Amplitude of Seismic Marker Layer Based on Empirical Mode Decomposition
  • Method for Eliminating Strong Reflection Amplitude of Seismic Marker Layer Based on Empirical Mode Decomposition

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Embodiment 1

[0032] This embodiment provides a method for eliminating strong reflection amplitudes of seismic marker layers based on empirical mode decomposition detection, including the following steps:

[0033] 1) Carry out empirical mode decomposition on the original seismic trace signal one by one, and decompose each original seismic trace signal to obtain a series of intrinsic mode functions IMF from high frequency to low frequency to trend item;

[0034] Empirical Mode Decomposition (EMD) is to decompose the original seismic trace signal into a series of intrinsic mode function IMF components, that is, the original seismic trace signal X(t)=C 1 (t)+C 2 (t)+...+C n (t)+R n (t); where C i (t) is the i-th IMF component, i=1~n, R n (t) is the margin.

[0035] 2) For a single original seismic trace signal, use the maximum correlation method to select the IMF components mainly embodied in coal seams and source rocks, and calculate the correlation coefficient between each IMF component...

Embodiment 2

[0045] On the basis of Example 1, this example takes the processing of a two-dimensional post-stack migration seismic section in the Sulige area of ​​the Ordos Basin as an example. This area is a tight sandstone reservoir.

[0046] figure 1 It is a two-dimensional post-stack migration original seismic profile in the Sulige area; firstly, the IMF signal is generated by the well-passed seismic trace and its EMD decomposition, such as image 3 Shown; Then analyze the correlation between the IMF signal and the original well-passing seismic signal after the EMD decomposition of the well-passing seismic trace, the results are as shown in table 1, and then obtain each IMF signal and the final reconstruction after utilizing the method of the present invention to process The seismic channel signal, such as Figure 4 shown. and figure 2 It is the seismic section figure processed by the method technology of the present invention.

[0047] Table 1:

[0048]

[0049] Figure 5 is...

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Abstract

The present invention provides a method for eliminating the strong reflection amplitude of seismic marker layers based on empirical mode decomposition, using the empirical mode decomposition method, combining correlation function analysis method and logging data to select the original seismic data that can best reflect the coal seam and hydrocarbon source For the IMF component of rock strength and amplitude thin layer characteristics, for the selected main IMF component, find its maximum energy point, estimate the main frequency of the IMF component signal, and determine the coal seam and source rock strong amplitude thin layer in this The time thickness of the top and bottom thin layers reflected in the IMF component, the IMF signal component within the time thickness range is strongly suppressed, while the remaining IMF components are kept unchanged, and finally all the processed IMF component signals are reconstructed In order to eliminate the strong reflection amplitude of the seismic marker layer in the seismic trace signal, enhance the weak change of the formation signal under the coexistence of coal measure strata, and strengthen the weak oil and gas response characteristics in the adjacent area.

Description

technical field [0001] The invention belongs to the technical field of petroleum geophysical exploration, and in particular relates to a method for eliminating strong reflection amplitudes of seismic marker layers based on empirical mode decomposition detection. Background technique [0002] The Ordos Basin is a large craton superimposed basin with multiple structural systems, multi-cycle evolution and multiple sedimentary types. The continental gas-producing layers in the Ordos Basin are mainly concentrated in the Yanchang Formation and the Paleozoic Shihezi Formation. Since the Mesozoic Chang 7 and Paleozoic He 8 and Shan 1 member tight oil and tight gas reservoirs in the Ordos Basin are close to Chang 7 The source rock and Paleozoic 8# coal, and the Chang 7 source rock and Paleozoic 8# coal seam will form strong reflection events on the seismic data, which are characterized by strong reflection on the seismic section, resulting in Mesozoic The tight oil and tight gas res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
Inventor 赵玉华付金华薛雅娟田仁飞张盟勃陈娟高利东程思检
Owner PETROCHINA CO LTD
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