In-well seismic data acquisition device and method based on MEMS optical fiber detector

Abstract

The invention discloses an in-well seismic data acquisition device and acquisition method based on an MEMS optical fiber detector, and the device comprises a ground artificial seismic source and a plurality of in-well three-component optical fiber seismic signal receiving and acquisition short circuits which are connected with a ground composite modulation and demodulation instrument through armored photoelectric composite cables. The armored photoelectric composite cable controls the depth position of the three-component optical fiber seismic signal receiving and collecting pup joint in the well and synchronously collects DASVSP data; a three-component optical fiber seismic signal sensor module and a three-component optical fiber attitude sensor are installed in each in-well three-component optical fiber seismic signal receiving and acquisition short circuit. The device is high in sensitivity, the acquisition device is very simple, the acquisition device descends into all high-temperature wells to acquire three-component seismic data or micro-seismic data in the high-quality wells, DAS-VSP data of the whole well section above a detector are synchronously acquired, and powerful technical support is provided for application of the oil reservoir geophysical technology.

Description

technical field [0001] The invention belongs to the technical field of wellbore geophysical exploration, in particular to a wellbore seismic data acquisition device and acquisition method based on a MEMS optical fiber detector. 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 encounters different geologic...

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Problems solved by technology

[0004] In order to solve the bottleneck problem that the conventional three-component geophone and the seismic data acquisition instrument in the well cannot work for a long time in the high-temperature well and the current long-distance cable data transmission capacity is limited, the present invention proposes a geophone in the well based on the MEMS optical fiber geophone The data acquisition device and acquisition method adopt a high-temperature-resistant MEMS-based optical fiber detector, a high-temperature-resistant three-component optical fiber attitude sensor, a photoelectric composite cable, and an optical fiber near the wellhead in the array type three-component optical fiber seismic signal receiving and acquisition device in the well. In-well three-component seismic data acquisition control and distributed optical fiber acoustic sensor (DAS) and optical fiber MEMS accelerometer compound modulation and demodulation instrument, realize the acquisition of in-well three-component seismic data in ultra-deep and ultra-high temperature wells, and three-component optical fiber detectors and above The DAS-VSP data acquisition of the whole well section and the high-speed transmission of a large amount of data collected with high density and high frequency from downhole to the wellhead solve the problem that the electronic devices in the downhole array conventional three-component geophone are difficult to work for a long time in a high temperature environment and a large amount of data in the downhole The bottleneck problem of high-speed transmission to the ground

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