Seismic acquisition observation system for underground microseismic detection

An observation system and seismic wave technology, applied in seismology for well logging, seismic signal transmission, seismic signal receiver, etc., can solve the problems of inability to form three-dimensional images, large spacing, etc., and achieve simple and uniform layout, easy-to-achieve effects

Inactive Publication Date: 2014-12-17
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

Its advantage is that the layout is simple and easy to implement. The disadvantage is that the farther away from the center point, the larger the distance in the arc direction, and it cannot form a three-dimensional image.

Method used

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  • Seismic acquisition observation system for underground microseismic detection
  • Seismic acquisition observation system for underground microseismic detection
  • Seismic acquisition observation system for underground microseismic detection

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example

[0028] Suppose: R1=50m; Rmax=2000m; DR=25m; DLmin=20m; DLmax=40m; N=8.

[0029] Then there are:

[0030] ①The observation system is composed of 79 concentric circles, the minimum circle radius R1 is 50m, the maximum circle radius Rmax is 2000m, the minimum circumference length is 314m, and the maximum circumference length is 12560m.

[0031] ②The radial distance (referred to as radial distance) DR of the receiving point is 25m;

[0032] ③The distance in the circumferential direction of the receiving point (referred to as the arc distance) is DLi, and there are 20m≤DLi≤40m

[0033] ④ 8 receiving points are evenly arranged on the first circle, 16 receiving points are evenly arranged on the 2nd to 3rd circle; 32 receiving points are evenly arranged on the 4th to 7th circle; 64 receiving points; 128 receiving points are evenly arranged on the 16th to 31st circle; 256 receiving points are evenly arranged on the 32nd to 64th circle; 512 receiving points are evenly arranged on the ...

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Abstract

The invention relates to a seismic acquisition observation system for underground microseismic detection, so that a problem that an existing system can not form a three-dimensional image can be solved. The provided system is formed by a plurality of concentric circles by taking a wellhead as a center O, thereby forming a circle-shaped structure. The number of receiving points arranged on each circumference varies and is generally increased with the increase of the circumference, so that uniformity of distribution of the receiving points can be kept. Received seismic data are in a circle-shaped three-dimensional structure with uniform arrangement, so that the attribute of a seismic wave can be displayed in a three-dimensional mode. Besides, the number of the receiving points arranged on the circumference doubles the number of the receiving points at an innermost ring and the arrangement is uniform; and a radial structure is formed while the circle-shaped structure is formed, wherein each radial ray can be used as a two-dimensional profile to display the attribute of the seismic wave. According to the invention, effectiveness and economy of the underground microseismic detection are fully considered; and the arrangement is simple and can be realized easily; a three-dimensional image can be formed; and the received seismic data are in the circle-shaped three-dimensional structure with the uniform arrangement, so that the attribute of the seismic wave can be displayed in a three-dimensional mode.

Description

technical field [0001] The invention relates to a microseismic detection and observation system, in particular to a seismic wave acquisition and observation system for downhole microseismic detection. technical background [0002] In seismic exploration, in order to obtain seismic records that can systematically track the effective waves of the target layer, the mutual positions of the excitation point and the receiving point must be properly arranged and selected during field data collection. This description describes the relationship between the excitation point and the receiving point and Arrangements and positional relationships between arrangements are called observation systems. [0003] The seismic wave acquisition and observation system for downhole microseismic detection is a relatively special observation system. Its excitation source is the microseismic generated by the fracture during reservoir fracturing, which is distributed around the well and has randomness....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/20G01V1/22G01V1/40
Inventor 郭建刘光鼎徐善辉张正峰
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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