Array type in-well four-component optical fiber seismic data acquisition device and data acquisition method

Abstract

The invention discloses an array type in-well four-component optical fiber seismic data acquisition device and a data acquisition method. The system comprises a ground artificial seismic source and aplurality of in-well four-component optical fiber seismic signal receiving and acquiring short circuits, and the in-well four-component optical fiber seismic signal receiving and acquiring short circuits are connected with a data acquisition control and modulation-demodulation instrument through armored photoelectric composite cables; a four-component optical fiber seismic signal sensing unit, a three-component optical fiber attitude sensor and an optical fiber inertial navigation gyroscope are arranged in each well four-component optical fiber seismic signal receiving and acquiring short circuit. According to the invention, a high-temperature-resistant three-component optical fiber detector and an optical fiber hydrophone are adopted underground; the frequency band range is larger than the frequency band response of the seismic signals in the well, the sensitivity is high, the underground four-component optical fiber seismic data acquisition device is very simple, the acquisition device can go down to all high-temperature wells to acquire the seismic data in the well, and powerful technical support is provided for efficient development of oil and gas fields.

Description

technical field [0001] The invention belongs to the technical field of wellbore geophysical exploration, and in particular relates to a four-component optical fiber seismic data acquisition device and a data acquisition method in an array type well. Background technique [0002] Borehole seismic technology includes vertical seismic profiling (VSP), crosswell seismic technology and borehole microseismic monitoring technology. Vertical seismic section technology is currently one of the most direct, effective and reliable geophysical exploration methods for detecting underground geological structures. Its basic principle and implementation method are to place multiple three-component geophones in the well at different depths at certain intervals, and perform single-point or multi-point seismic source excitation near the surface or water surface wellhead or its adjacent areas. The seismic wave generated by the excitation propagates underground, and when the seismic wave encount...

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Problems solved by technology

[0004] In order to solve the difficult bottleneck problem that conventional downhole conventional three-component geophone seismic data acquisition instruments cannot work for a long time in high-temperature wells and the long-distance cable data transmission capacity is limited, the present invention proposes an array type four-component optical fiber seismic data acquisition device in wells , through the use of high-temperature-resistant three-component fiber optic detectors, high-temperature-resistant fiber-optic hydrophones, high-temperature-resistant three-component fiber-optic attitude sensors and high-temperature-resistant fiber optic gyroscopes in the array fiber optic seismic signal receiving and collecting device in the well to achieve ultra-deep The acquisition of four-component seismic data in ultra-high temperature wells and the high-speed transmission of a large amount of high-density and high-frequency acquisition data from downhole to wellhead solve the problem that the electronic devices in the conventional three-component geophone array in the downhole are difficult to work for a long time in a high temperature environment and downhole The bottleneck problem of high-speed transmission of large amounts of data to the surface through logging cables

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