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Seismic prospecting method

A technology for seismic exploration and seismic data, which is applied in the field of seismic exploration and can solve problems such as increasing acquisition time

Active Publication Date: 2018-04-17
BEIJING PETROSOUND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since this technology is essentially a branch of the micro-motion technology of passive source (that is, non-artificial source) earthquakes, its advantage is that the active source is omitted, and its disadvantage is that it increases a large amount of acquisition time, and its application in high-noise backgrounds such as cities remains to be seen. further research

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Embodiment 1

[0032] Such as figure 2 As shown, in the carbonate area, the seismic prospecting method provided by the present invention is compared with the S-wave velocity profile obtained by the surface wave. It can be seen from the figure that the shallow low-velocity layer is clearly reflected in the former figure; the low-velocity and high-speed interface in the carbonate region is delineated by the present invention as an important extreme value boundary. Drilling at a depth of 50 meters in the middle of the survey line reveals that karst is developed, and the surface wave velocity is characterized by low values, which correspond to low-value abnormal traps on the wave impedance profile obtained by elastic wave resonance analysis.

[0033] The seismic prospecting method provided by the present invention is fully capable of discovering geological bodies like carbonate caves.

Embodiment 2

[0035] Such as image 3 As shown, the seismic exploration method provided by the present invention is applied to the example of the defect under the road. In the example, the radar under the road found anomalies, and the technology was used to find the anomalies of the low-wave impedance rate. The survey result was that the rainwater caused the side leakage of the sewer, and the anomalies corresponded to the position of the largest S-wave impedance change.

[0036] The seismic exploration method provided by the invention can be used to detect defects under roads.

[0037] image 3 An example of applying this technique to a defect below a road. In the example, the radar under the road found anomalies, and this technology was used to find anomalies in the low-wave impedance rate. The survey results showed that rainwater caused side leakage of the sewer.

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Abstract

The invention relates to a seismic prospecting method via elastic wave resonance, and belongs to the fields engineering construction, resources and environment. The technical method in which active tri-component seismic prospecting data is used to obtain the wave impedance rate of S waves comprises the steps including data collection and construction and a data processing flow. The method can be used to solve the problems that passive seismic prospecting precision in specific areas (as in a town and an engineering construction place) is low in precision and slow in construction, boundaries ofa target object in surface wave prospecting are fuzzy and a spatial geometric position of the target object is hard to define; and the rapid solution is provided for seismic prospecting in areas of complex construction, especially in the shallow layer.

Description

technical field [0001] The invention belongs to the field of seismic exploration, and in particular relates to a seismic exploration method. Background technique [0002] As far as the existing seismic exploration is concerned, the time-domain reflection exploration scheme is mainly adopted, that is, assuming that the propagation of elastic seismic waves in time and space satisfies the wave equation and its boundary conditions, the artificial source seismic reflection wave sequence is collected on the earth’s surface, along the time The time-domain data is processed and imaged with the space propagation process and route, and the final result profile is expressed in the time domain or the time-converted depth domain, that is, the wave impedance difference expressed in the form of fluctuations. Traditionally, this kind of exploration technology has a weakness, which is that it is difficult to image shallow geological bodies or geological bodies with steep dip angles. The main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/00
CPCG01V1/00
Inventor 薛爱民
Owner BEIJING PETROSOUND TECH CO LTD
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