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Method of detecting elimination of seismic marked layer strong reflection amplitude based on empirical mode decomposition

An empirical mode decomposition and marker layer technology, applied in the field of petroleum geophysical exploration, can solve problems such as distortion, failure to reflect the real situation of underground media, and low calculation efficiency, and achieve instantaneous property enhancement, enhanced oil and gas response characteristics, and fast calculation speed Effect

Active Publication Date: 2015-11-11
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 of detecting elimination of seismic marked layer strong reflection amplitude based on empirical mode decomposition
  • Method of detecting elimination of seismic marked layer strong reflection amplitude based on empirical mode decomposition
  • Method of detecting elimination of seismic marked layer strong reflection amplitude 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 main IMF components 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. Table 1:

[0047]

[0048] Figure 5 is the inst...

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Abstract

The invention provides a method of detecting elimination of seismic marked layer strong reflection amplitude based on empirical mode decomposition. An empirical mode decomposition method is used, a correlation function analysis method and logging data are combined for selecting IMF components most reflecting features of a coal bed and a source rock strong amplitude thin layer from original seismic data, the maximal energy point is found out from optimized main IMF components, the main frequency of the IMF component signal is estimated, time thickness of the thin layer between the top and the bottom reflected by the coal bed and the source rock strong amplitude thin layer in the IMF component is determined on the basis, strong amplitude suppression is carried out on the IMF signal components in the time thickness range, the rest IMF components are remained unchanged, all processed IMF component signals are reconstructed to realize elimination on seismic marked layer strong reflection amplitude in seismic trace signals, weak changes of strata signals are enhanced in the condition of coexistence between coal measure strata, and weak oil and gas response characteristics in the neighborhood field are enhanced.

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 Applications(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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