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Stratum structure investigation system and method combining VSP and acoustic logging

A survey system and sound wave technology, applied in the field of geophysical exploration, can solve problems such as high cost and low survey efficiency, and achieve the effects of improving efficiency, improving quality, and isolating crosstalk

Active Publication Date: 2021-06-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the formation structure investigation system combined with VSP and acoustic logging provided by the present invention solves the problems of low investigation efficiency and high cost of existing investigation methods

Method used

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  • Stratum structure investigation system and method combining VSP and acoustic logging
  • Stratum structure investigation system and method combining VSP and acoustic logging
  • Stratum structure investigation system and method combining VSP and acoustic logging

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Such as figure 1 As shown, a formation structure investigation system combining VSP and acoustic logging, its uDAS instrument 1, VSP optical cable 3, acoustic logging device, first circulator 2 and second circulator 4;

[0051]The first port of the first circulator 2 is connected with the sending end of the uDAS instrument 1, the second port of the first circulator 2 is connected with the first port of the second circulator 4 through the VSP optical cable 3, the first circulator 2 The third port is connected to the first receiving end of the uDAS instrument 1 , the second port of the second circulator 4 is connected to the acoustic logging device, and the third port of the second circulator 4 is connected to the second receiving end of the uDAS instrument 1 .

[0052] The uDAS instrument 1 in this embodiment is used to detect and restore the vibration signal and the acoustic wave signal received by the VSP optical cable 3 and the acoustic logging device, and demodulate ...

Embodiment 2

[0063] Such as Figure 6 Shown: a formation structure investigation method combining VSP and acoustic logging, including the following steps:

[0064] S1. Install the acoustic logging device at the position where formation structure investigation is required;

[0065] S2. The pulsed laser is emitted from the sending end of the uDAS instrument and enters the VSP optical cable after passing through the first circulator;

[0066] S3. Make the backscattered light carrying the vibration signal generated by the pulsed laser propagating in the VSP optical cable return to the first receiving end of the uDAS instrument through the third port of the first circulator, and demodulate the corresponding vibration information;

[0067] Specifically, the pulsed laser propagates in the VSP optical cable to generate backscattered light carrying vibration information and returns along the optical cable to the first receiving end of the uDAS instrument through the third port of the first circula...

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Abstract

The invention discloses a stratigraphic structure investigation system and method combining VSP and acoustic logging, in the system, a first port of a first circulator is connected with a transmitting end of a uDAS instrument, a second port of the first circulator is connected with a first port of a second circulator through a VSP optical cable, a third port of the first circulator is connected with a receiving end of the uDAS instrument, the second port of the second circulator is connected with the acoustic logging device, and the third port of the second circulator is connected with the receiving end of the uDAS instrument. VSP logging and acoustic logging are completed at the same time through the same laser pulse sent by the uDAS instrument, stratum structure exploration is carried out, the efficiency is improved, meanwhile, the cost is saved, the VSP optical cable and the optical cable wound on the acoustic logging device can be used for receiving signals, signal transmission is achieved, and the problem of high-speed transmission of a large number of signals received in a well is solved.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and in particular relates to a stratum structure investigation system and method combining VSP and acoustic logging. Background technique [0002] Vertical seismic profiling (VSP) is a seismic observation method, which usually corresponds to the seismic section observed on the ground. When using traditional electronic geophones, the seismic section observed on the ground excites seismic waves at some points near the surface. At the same time, observations are made at some receiver points arranged along the surface survey line; the vertical seismic section also excites seismic waves at some points near the surface, but it is observed at some receiver points arranged at different depths along the wellhead, using a new type of optical fiber During wave detection, seamless observation can be realized, and an optical cable is arranged in the well to observe all positions in the well at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/40
CPCG01V1/40G01V2210/161
Inventor 冉曾令肖彦波孙东饶云江苟量王熙明
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA