Synchronous acquisition and processing system for weak signals of 104 channels of three-dimensional acoustic wave near the probe
A weak signal, synchronous acquisition technology, applied in seismic signal processing, seismic signal transmission, seismology for logging records, etc., to achieve the effect of improving logging efficiency, good compression effect, and reducing transmission volume
Active Publication Date: 2016-06-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
3D acoustic logging needs to collect 104 channel waveforms, which poses a great challenge to achieve the consistency of channel waveforms
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[0037] figure 1 It is a schematic diagram of the structure of a three-dimensional acoustic logging tool;
[0038] Such as figure 1 As shown, the three-dimensional acoustic logging tool uses three monopole transmitting transducers and two orthogonal dipole transmitting transducers to transmit acoustic signals, and 13 sets of receiving transducers R1 to R13 are used to receive the acoustic signals. . Among them, the three monopole transmitters are the upper monopole transmitter, the lower monopole transmitter and the far monopole transmitter. The upper monopole transmitter and the lower monopole transmitter are located at both ends of the receiver array, and the far monopole transmitter The transmitter and two X, Y quadrature dipole transmitters are located farther away from the lower part of the instrument. Three monopole transmitters are used to generate longitudinal waves, transverse waves and Stoneley waves with different source distances, and X and Y dipole transmitters are u...
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The invention discloses a synchronous acquisition and processing system of weak signals of three-dimensional sound wave near-probe 104 channels. The system comprises one control panel and 13 identical acquisition panels. After receiving a command sent by a ground system, an acquisition control module in the control panel initializes the 13 acquisition panels and configures related parameters of the 13 acquisition panels, weak signal synchronous acquisition and processing modules of the acquisition panels carry out counting according to initial pulses and returned pulses to obtain delay time, and when it is detected that the acquisition control module sends out an acquisition starting command, the 13 acquisition panels are delayed by corresponding time respectively and collect and send sound wave data. The acquisition control module receives sound wave data of the 104 channels of the 13 acquisition panels, a sound wave real-time lossless compression module is used for lossless compressing the data in real time and uploading the compression result, so that more accuracy sound wave signals and interval transit time information are obtained, transmission quantity of the sound wave data is reduced, and well logging efficiency is greatly improved.
Description
Technical field [0001] The present invention belongs to the technical field of weak signal acquisition and processing, and more specifically, relates to a system for synchronous acquisition and processing of weak signals of a three-dimensional acoustic wave near probe 104 channel. Background technique [0002] Three-dimensional sonic logging is a new generation of sonic logging technology developed on the basis of orthogonal dipole sonic logging technology. Its measurement principle is to use all current acoustic waves, namely monopole, dipole and Stoneley wave measurement modes. Comprehensive measurement of waveforms in various frequency bands to obtain the three-dimensional acoustic characteristics of the formation, that is, longitudinal, transverse and Stoneley wave changes in the shaft, radial and circumferential directions of the wellbore, providing a complete description of the azimuth of the formation characteristics. Through this technology, the anisotropy of the homogene...
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IPC IPC(8): G01V1/40G01V1/22G01V1/28
Inventor 师奕兵张伟张伟杰蒋天植马东蒲利程瑶
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA