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Pseudorandom spectrum-spread electromagnetic wave tomographic imaging instrument and method for achieving imaging

A technology of tomography and electromagnetic wave, which is applied in the direction of electromagnetic wave detection and electric/magnetic detection for well logging records, etc., can solve the problem of low resolution, improve signal-to-noise ratio, improve anti-interference ability, increase The effect of large penetration distance

Active Publication Date: 2015-04-22
WUHAN ENG SCI & TECH RESINST
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Problems solved by technology

Under the working frequency conditions of the above-mentioned currently commonly used electromagnetic wave tomography imagers, the resolution is low, and the existing technology cannot solve the above problems well

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  • Pseudorandom spectrum-spread electromagnetic wave tomographic imaging instrument and method for achieving imaging
  • Pseudorandom spectrum-spread electromagnetic wave tomographic imaging instrument and method for achieving imaging
  • Pseudorandom spectrum-spread electromagnetic wave tomographic imaging instrument and method for achieving imaging

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] like figure 1 As shown, the pseudo-random spread-spectrum electromagnetic wave tomography apparatus of the present invention includes a host 1 located on the ground, and the host 1 includes a data processor, and the data processor includes a synchronous controller, a first pseudo-random sequence generator, a demodulator, a signal Correlator, Signal Strength Estimator. Wherein, the demodulator, the signal correlator and the signal strength estimator are sequentially connected by electrical signals, and the first pseudo-random sequence generator is respectively connected with the synchronous controller and the signal correlator. The data processor used in this embodiment is a DSP, and the DSP is also connected to a man-machine interface.

[0026] The present invention also includes a first cable winch 3, a first wellhead pulley...

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Abstract

The invention relates to a pseudorandom spectrum-spread electromagnetic wave tomographic imaging instrument and a method for achieving imaging. The imaging instrument comprises a pseudorandom sequence generator, a modulator, a power amplifier and a transmitting antenna which are sequentially connected, and further comprises a signal receiving antenna, a demodulator, a signal correlator and a signal strength estimator which are sequentially connected, wherein the signal correlator is connected with the pseudorandom sequence generator which is connected with a synchronous controller, and the synchronous controller is connected with a data processing host which is connected with a human-computer interface. Under the condition that conditions such as transmission energy, working frequencies and detected objects are basically the same, by means of the pseudorandom code spectrum-spread technology, the system can have high interference resistance, and the detection penetration distance can be increased to a certain extent.

Description

technical field [0001] The invention relates to a tomographic imaging system between wells or tunnels, in particular to a pseudo-random spread spectrum electromagnetic wave tomographic imager and a method for realizing imaging. Background technique [0002] At present, the biggest technical problem faced by geophysical tomography technology is the insufficient penetration distance and the contradiction between detection distance and resolution. Geophysical tomography is broadly divided into two categories, namely electromagnetic wave tomography and elastic wave tomography. Electromagnetic wave tomography has two types: interwell electromagnetic imaging and absorption coefficient imaging. is the formation resistivity. At present, this method is mainly used in the exploration of oil and gas reservoirs. In non-metallic casing wells, the penetration distance can reach 400m-500m. The typical instrument is represented by the American XHB2000 EM imaging measurement system; The pa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/30
Inventor 肖柏勋李太全刘玉曾浩金彦
Owner WUHAN ENG SCI & TECH RESINST
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