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Layering method suitable for shallow stratum layer of sedimentation basin

A stratigraphic and shallow layer technology, applied in seismology, geophysical measurement, seismic signal processing, etc., can solve the problems of inability to generate reflected wave events, increase the difficulty of ore-forming target layers, and increase the blind area of ​​reflected wave exploration, etc.

Active Publication Date: 2013-10-23
BEIJING RES INST OF URANIUM GEOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for placer gold, sandstone-type uranium deposits and coal with high economic value, quite a few of them have shallow burial depth, and the difference in wave impedance between the ore-forming target layer and the surrounding rock is small, so that the surrounding rock and the ore-forming target The interface of the layer usually cannot generate the reflected wave event; in addition, in order to obtain the reflected wave with a higher signal-to-noise ratio, a larger offset distance is generally selected, which also leads to the increase of the blind spot of the reflected wave exploration
This increases the difficulty of seismic exploration to detect mineralization target layers in this depth range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The present invention comprises the following steps in turn:

[0018] Step 1: When the total depth of the stratum to be stratified is less than 50 meters, use seismic waves to extract the dispersion curve of seismic waves; the detection conditions are: 12 seismic acquisition channels, 20 Hz geophone frequency, 5 meters offset distance, and 1 channel spacing 1 meter, sampling rate 0.5 milliseconds, recording length 1 second, end-point excitation, well depth 3 meters, charge 1 kg; along the survey line, conduct field measurements at a fixed shot spacing of 5 meters;

[0019] Through the extraction of the seismic wave dispersion curve, the density and compressional wave velocity of the formation within the detection range are inverted;

[0020] The second step is to obtain the wave impedance parameter, which is the density (ton / m 3 ) and the product of the longitudinal wave velocity (m / s);

[0021] The third step is to select the lowest value of the wave impedance parame...

Embodiment 2

[0023] The present invention comprises the following steps in turn:

[0024] The first step, when the total depth of the stratum to be stratified is 50 meters to 100 meters, use the seismic wave to extract the dispersion curve of the seismic wave; the detection conditions are: 48 seismic acquisition channels, the receiver frequency is 10 Hz, and the offset distance is 10 meters , the track spacing is 5 meters, the sampling rate is 1 millisecond, the recording length is 2 seconds, the end point is excited, the well depth is 4 meters, and the dose is 2 kilograms; along the survey line, the field measurement is carried out according to the fixed shot spacing of 10 meters;

[0025] Inversion of the density and compressional wave velocity of the formation within the detection range through the dispersion curve of the seismic wave;

[0026] The second step is to obtain the wave impedance parameter, which is the density (ton / m 3 ) and the product of the longitudinal wave velocity (m...

Embodiment 3

[0029] The present invention comprises the following steps in turn:

[0030] The first step, when the total depth of the stratum to be stratified is 100 meters to 150 meters, use the seismic wave to extract the dispersion curve of the seismic wave; the detection conditions are: the seismic acquisition channel is 96 channels, the receiver frequency is 4Hz, and the offset distance is 30 meters , the track spacing is 10 meters, the sampling rate is 2 milliseconds, the recording length is 2 seconds, the endpoint is excited, the well depth is 10 meters, and the charge is 2 kilograms; along the survey line, the field measurement is carried out according to a fixed shot spacing of 50 meters;

[0031] Inversion of the density and compressional wave velocity of the formation within the detection range through the dispersion curve of the seismic body wave;

[0032] The second step is to obtain the wave impedance parameter, which is the density (ton / m 3 ) and the product of the longitud...

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Abstract

The invention relates to a layering method suitable for a shallow stratum layer of a sedimentation basin. The method successively comprises that 1) seismic waves are carried out the shallow stratum layer of the sedimentation basin, a dispersion curve of the seismic waves is extracted, and the density and longitudinal-wave speed of the stratum layer within a detection range are obtained via inversion; 2) the wave impedance parameter which is the product of the density (t / m<3>) and the longitudinal-wave speed (m / s) is obtained; and 3) the minimum value 1400-1600 and the maximum value 3400-3600 of the wave impedance parameter are selected, and contour lines are made every 500 units from low to high within the range from the minimum value to the maximum value to successively form a gravel-contained sandstone layer, a gravel-contained coarse sandstone layer, a gravel-contained mudstone layer and a mudstone layer. According to the method, the wave impedance parameter is the product of the density and the longitudinal-wave speed, and the performance of the stratum layer is divided according to different value ranges of the impedance parameter, thereby providing basis for predicting the coal position in a gulch-gold sandstone uranium mine.

Description

technical field [0001] The invention relates to a delamination method suitable for shallow formations in sedimentary basins, in particular to a delamination method using seismic waves to calculate density and longitudinal wave velocity and using wave impedance to perform delamination. Background technique [0002] Seismic exploration is one of the commonly used methods for stratigraphic stratification in sedimentary basins. Based on the tracking of the reflected wave event, this method can often achieve better results when detecting strata or bases with a buried depth of several hundred meters or less (when the wave impedance differs greatly). However, for placer gold, sandstone-type uranium deposits and coal with high economic value, quite a few of them have shallow burial depth, and the difference in wave impedance between the ore-forming target layer and the surrounding rock is small, so that the surrounding rock and the ore-forming target Usually, the interface of the l...

Claims

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Application Information

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IPC IPC(8): G01V1/00G01V1/28
Inventor 徐贵来吴曲波潘自强
Owner BEIJING RES INST OF URANIUM GEOLOGY