Method and system for establishing depth domain layer Q model based on reflection seismic data

A depth domain and stratigraphic technology, which is applied in the field of building a depth domain layer Q model based on reflection seismic data, can solve the problem that the effect of thin layer tuning cannot be eliminated, and achieve the effect of improving the resolution ability.

Active Publication Date: 2018-08-24
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The method of inverting the equivalent Q value of the formation based on the post-stack common center point gathers, because the data it applies come from different offsets, the propagation paths, distances and incident angles of the seismic waves are not the same, resulting in the obtained formation The equivalent Q value is based on the compromise and mixed effects; this method also cannot eliminate the influence of the thin layer tuning of the seismic reflection, and the thin layer tuning is due to the interaction of the reflected waves of a group of similar interfaces to cause the reflected wave A large change in the spectrum of the , this change is even much greater than the effect of absorption attenuation

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  • Method and system for establishing depth domain layer Q model based on reflection seismic data
  • Method and system for establishing depth domain layer Q model based on reflection seismic data
  • Method and system for establishing depth domain layer Q model based on reflection seismic data

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Embodiment 1

[0026] According to an embodiment of the present invention, an embodiment of a method for establishing a depth-domain layer Q model based on reflection seismic data is provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be executed in a set of computer-executable instructions such as and, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0027] figure 1 It is a flowchart of a method for establishing a depth-domain layer Q model based on reflection seismic data according to an embodiment of the present invention, such as figure 1 As shown, the method includes the following steps:

[0028] Step S102, determine the first section set and the second section according to the pre-stack seismic data and the stratigraphic equivalent Q value sequence of the target work area, the first section set and the second sectio...

Embodiment 1

[0139] Through the two-dimensional model data, the application effect of a method for establishing the Q model in the depth domain based on reflection seismic data is illustrated. Total shot point observation, shot point spacing 12.5 meters, track spacing 3.125 meters, 1056 shots per shot, time sampling interval 1 millisecond, 3000 samples, 524 shot data in total, and the main frequency of the Reker wavelet is 30 Hz. Velocity models for forward modeling applications such as image 3 As shown, the stratum layer Q value model is as Figure 4 shown. The conventional pre-stack depth migration imaging profile obtained by using the forward modeling data under the condition of ignoring the stratigraphic Q value model is as follows: Figure 5 As shown in , the resolution in the migration results is significantly lower, especially when the deep strata are mixed together. Utilize the stratum layer Q value model that the present invention elaborates method to set up based on forward m...

Embodiment 2

[0141] Through the 3D reflection seismic industrial data, the application effect of a method for establishing depth-domain layer Q model based on reflection seismic data is illustrated. Total shot point observation, shot point spacing in the inline direction is 250 meters, track spacing is 25 meters, shot point spacing in the crossline direction is 100 meters, track spacing is 200 meters, the number of shots per shot is 1920, the time sampling interval is 4 milliseconds, and the number of samples is 1250. A total of 2160 gun data. Neglecting the stratigraphic Q-value model, the conventional pre-stack depth migration local imaging profile obtained from the 3D reflection seismic industry data is as follows: Figure 8 shown. Figure 9 It is the local contour map of the stratum Q value model established on the 991 imaging line based on the 3D reflection seismic industrial data, and the numbers in the figure are the stratum Q value values. consider Figure 9 For the stratigraphi...

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Abstract

The invention provides a method and system for establishing a depth domain layer Q model based on reflection seismic data. The method is characterized by determining a first profile set and a second profile according to pre-stack seismic data of a target work area and a stratum equivalent Q value sequence; based on the first profile set and the second profile, determining a compliance stratum equivalent Q value of a target line at a target CDP in different time windows, and determining an equivalent Q value of all time sampling at the target CDP based on the compliance stratum equivalent Q value; obtaining a layer Q value of a time domain at the target CDP based on the equivalent Q value of all time sampling at the target CDP; determining an initial depth domain layer Q model of the targetwork area based on the layer Q value and depth domain interval velocity; according to a preset percentage sequence and the initial depth domain layer Q model, determining a viscoelasticity pre-stackdepth migration profile set corresponding to the percentage sequence; and based on the viscoelasticity pre-stack depth migration profile set and the initial depth domain layer Q model, obtaining the depth domain layer Q model of the target work area.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a method and system for establishing a Q model in depth domain based on reflection seismic data. Background technique [0002] There is viscous absorption in the actual earth medium, and the small-scale inhomogeneity of the earth medium will also produce an amplitude attenuation effect similar to viscous absorption. Therefore, the amplitude of the seismic wave will undergo absorption attenuation and frequency-dependent propagation velocity changes during the propagation process; the attenuation of the amplitude is different for different frequency components of the seismic wave. The higher the frequency, the stronger the attenuation, which leads to the received reflection The effective frequency band of seismic data gradually narrows with the reflection depth; and different frequency components propagate at different speeds, which also leads to the dispersion of seism...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/301G01V2210/512G01V2210/66
Inventor 刘礼农刘伟张剑锋
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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