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Method for determining effective excitation region based on lighting analysis

A region and excitation point technology, applied in the field of geophysical exploration, can solve the problem of amplitude or energy analysis without target layer, and achieve the effect of improving quality

Active Publication Date: 2012-07-04
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0006] These methods only analyze the observation system itself, and do not really analyze the amplitude or energy that can be observed in the target layer

Method used

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  • Method for determining effective excitation region based on lighting analysis
  • Method for determining effective excitation region based on lighting analysis
  • Method for determining effective excitation region based on lighting analysis

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] To solve the problem of poor imaging of the target layer or failure to observe a certain underground target layer, the present invention starts from the weakly illuminated layer and uses the reverse seismic wave lighting method to obtain the illumination intensity of the target layer on the surface. Then, according to the change of the smooth curve of the surface illumination, the effective excitation range is determined.

[0030] The present invention is realized through the following specific steps:

[0031] 1) Establish a more accurate two-dimensional geological velocity model of the target area; figure 1 is the velocity field model of the exploration target area, and the black solid line is the target layer to be studied in this area. In order to conduct illumination analysis, a more accurate velocity profile of the target area should be established firs...

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Abstract

The invention discloses a method for determining an effective excitation region in seismic exploration acquisition. The method comprises the following steps of: determining a lighting shadow region of a target body by using a wave equation lighting algorithm; placing a plane wave excitation source on a target horizon; obtaining a lighting intensity amplitude value for upward lighting at the shadow region on ground; normalizing and smoothing the lighting intensity amplitude value; determining the optimal ground surface excitation point distribution section; and increasing the number of the excitation points on the original basis according to an integral interval of a spacing to newly determine the effective excitation region. According to the method, the problem of way of rationally distributing the excitation points on a target stratum is solved by using seismic wave lighting analysis, rational distribution of the positions of the excitation points for seismic acquisition is facilitated, and the quality for original data of the seismic exploitation can be improved. The method is particularly suitable for complex target exploitation regions of salt dome structures, over-thrust nappe structures, igneous rocks and the like.

Description

technical field [0001] The invention relates to geophysical prospecting technology, and is a method for determining an effective excitation area in seismic prospecting and acquisition. Background technique [0002] In the acquisition design of seismic exploration, using a given observation system to simulate field acquisition observation, due to the influence of factors such as the velocity, dip angle, and structural shape of the stratum, the seismic wave illumination intensity will be unevenly distributed in space, and the illumination intensity is significantly lower than that of other seismic waves. Areas of ambient intensity, or shadows of lighting. [0003] In order to optimize the excitation point to obtain better excitation effect and improve the imaging quality of seismic data, for the illuminated shadow area, or the determined area with poor imaging, and the target interval with weak reflection information, it is necessary to analyze the given geological structure m...

Claims

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Application Information

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IPC IPC(8): G01V1/30
Inventor 李培明蔡锡伟吴迪何宝庆
Owner BC P INC CHINA NAT PETROLEUM CORP
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