Two-axis optical fiber sensing seismic wave detector

Abstract

The invention discloses a two-axis optical fiber sensing seismic wave detector, and relates to the field of optical fiber sensing technologies. The two-axis optical fiber sensing seismic wave detectorcomprises a narrow linewidth laser, an X-axis photoelectric detector, a Y-axis photoelectric detector, a first 3dB coupler, a second 3dB coupler, a third 3dB coupler, a fourth 3dB coupler and a fifth3dB coupler, and is characterized by further comprising a mass body, wherein the periphery of the mass body is connected with a first spiral ring shaped optical fiber, a second spiral ring shaped optical fiber, a third spiral ring shaped optical fiber and a fourth spiral ring shaped optical fiber. The two-axis optical fiber sensing seismic wave detector is not simple in structure and good in economy, but also has the advantages of fast response, high reliability and the like, and has very wide application prospects on the aspects such as advanced forecasting and petroleum exploration.

Description

Technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a two-axis optical fiber sensing seismic wave detector. Background technique [0002] With the development of seismic exploration technology, especially the deepening of high-resolution exploration, the accuracy and quality requirements of seismic exploration data acquisition are getting higher and higher. The acquired data is required to have broadband, high fidelity, high signal-to-noise ratio, and high dynamics. In order to better identify the geological structure, lithology, fluid, and fractured reservoirs, improve reservoir positioning, reservoir characteristics, description of reservoir connectivity, and enhance oil recovery. As one of the key components of field data acquisition, the performance of the geophone is directly related to the quality of the collected data and the effect of geological analysis. [0003] In conventional reflection seismic exploration, the...

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Problems solved by technology

[0005] The permanent magnet of the electromagnetic induction geophone is greatly affected by temperature and geomagnetism, is easily oxidized and has an unstable magnetic field, so the geophone has low sensitivity, poor stability and repeatability

The on-site workload is heavy, there are many natural frequency selections, a large number of geophone combinations are required, the arrangement is complex, and the intensity is high

In the actual detection work, geological prospecting personnel need to carry a large amount of measuring equipment, especially when laying out the detector array, the heavy cables and numerous detectors are unbearable

The detection location is often in the deep mountains and forests, and the workload is heavy. At the same time, the detector cable is easily disturbed by the external electromagnetic field, which affects the reliability of the data.

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