Laminated dielectric double-focusing method for earthquake observation system optimized design

A seismic observation system and optimization design technology, applied in the field of seismic exploration, can solve problems such as inability to apply 3D seismic acquisition design

Active Publication Date: 2005-09-28
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

Practice has shown that the homogeneous medium double-focus analysis method cannot be applied to the 3D seismic...

Method used

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  • Laminated dielectric double-focusing method for earthquake observation system optimized design
  • Laminated dielectric double-focusing method for earthquake observation system optimized design
  • Laminated dielectric double-focusing method for earthquake observation system optimized design

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0180] Example 1: Verification of double focusing method in layered media

[0181] The three-dimensional observation system selects 8 lines and 8 gun wire harness templates; the longitudinal arrangement is 0-200-2500m, the track distance is 100m, the rolling distance is 200m, and the rolling is 20 times; Second; the construction area is 3.3km×4.6km, the size of the model is set at 3300×4600×3000m3, the target point is designated as the center of the bottom of the model, and the main frequency of the pressure wave is selected as 30Hz.

[0182] Design 3 constant velocity models (see Figure 5 ), the velocity of each layer is 3000m / s, model 1 is a homogeneous medium, model 2 is a two-layer inclined medium, and model 3 is a three-layer horizontal medium. It is predicted that the three experimental results should have the same resolution, so as to verify the correctness of the algorithm.

[0183] Figure 6 , Figure 7 are the resolution function images of the 3 models, which ar...

example 2

[0184] Example 2: Spatial Resolution Calculation

[0185] The size of the 3D model is 4000×4000×3000m3, the medium velocity of the three layers from top to bottom is 2500m / s, 2900m / s and 3200m / s in turn, and the inclination angles of the interfaces of the middle two layers are 10° and 5° respectively. is the direction of the transverse line, the depths of the midpoint of the interface are 800m and 1500m respectively, and the scattering point is located in the middle of the bottom of the model with a depth of 3000m (see Figure 8 ).

[0186] The observation system is located on the surface level, with 8 lines and 8 shots, the shot point distance is 100m, the receiver point distance is 50m, the receiver line distance is 200m, the horizontal rolling distance of the template is 800m, the vertical rolling distance is 200m, and the rolling times are 4 times in the horizontal direction and 5 times in the vertical direction.

[0187] The included angles between the imaging plane and ...

example 3

[0195] Example 3: Analysis and comparison of two 3D observation systems, wide and narrow

[0196] Two observation systems, narrow azimuth 6 lines and 6 shots and wide azimuth 12 lines and 9 shots, were selected for comparison. The total number of arrays is 96, the track distance is 50m, the shot is fired at the center, the shot point distance is 100m, the number of coverage is 48 times, the buried depth of the target point is 2500m, and the root mean square velocity of the medium is 2300m / s.

[0197] Figure 11 It is a comparison chart of CMP bin attributes. The comparison results are: the histogram distribution of the 6L6S observation system is relatively uniform, and the longitudinal information is rich and complete, which is conducive to ensuring the accuracy of velocity analysis; but the lack of horizontal information is not conducive to the three-dimensional parameter analysis. The 12L9S observation system has a more reasonable distribution of the azimuth lines of the o...

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Abstract

The present invention relates to seismic prospecting technology, and is especially laminated medium double focusing method for optimized seismic observation system and its application. The laminated medium double focusing mold is established through the steps of: 1. multiplying serial interlaminar spread operators to realize the forward spread effect from the seismic source to the underground target; 2. multiplying serial interlaminar spread operators to realize the forward spread effect from the underground target to surface geophone array; 3. multiplying serial interlaminar spread operators to realize the reverse focusing seismic source effect from the underground target to the surface seismic source and the reverse focusing detection effect from the surface geophone array to the underground target; and 4. substituting homogeneous medium in the double focusing calculation of the steps 1-3 to find out three characteristic functions.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to the optimal design of a three-dimensional observation system for specific exploration targets in complex areas, and in particular to a layered medium double-focusing method for optimal design of a seismic observation system and its application. Background technique [0002] Excitation, reception and observation systems are the three main components of seismic data acquisition. The design level of the 3D observation system directly affects the imaging quality of the underground structure, and also directly determines the total amount of field construction, so it is the first focus in the design of 3D seismic data acquisition technology. [0003] At present, the optimal design method commonly used in conventional 3D seismic exploration is the CMP bin attribute analysis method. This method is based on the theory of underground common central point (CMP) horizontal stack...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
Inventor 狄帮让顾培成曹卫平倪成洲全海燕顾冲
Owner BC P INC CHINA NAT PETROLEUM CORP
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