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Experimental measurement method for seismic-electric signal

A measurement method and technology of electrical signals, applied in the field of geophysical research, can solve the problems of lack of research on seismic signals, unsuitable experimental measurement and research of seismic signals, etc., and achieve good operability and repeatability

Inactive Publication Date: 2016-07-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these two detection methods and devices are suitable for field seismoelectric exploration, not for experimental measurement and research of seismoelectric signals
Moreover, judging from the current research on seismoelectric signals at home and abroad, a large number of scholars use numerical simulation methods for research, but there is a lack of experimental research on seismoelectric signals.

Method used

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  • Experimental measurement method for seismic-electric signal
  • Experimental measurement method for seismic-electric signal
  • Experimental measurement method for seismic-electric signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this example, inject a certain amount of tap water into the water tank 7, the conductivity of the tap water used is 0.08S / m, and start the experiment after standing until there are fewer air bubbles;

[0048] Fix the excitation transducer 3 with a main frequency of 500KHz, the receiving electrode 2 and the artificial sandstone rock sample (rock sample 1) on the support, and maintain horizontal alignment, and immerse into the water;

[0049] Connect the excitation transducer 3 with a main frequency of 500KHz to the output terminal of the square wave ultrasonic pulse transmitter 4, adjust the electric pulse repetition period to 500 times, the electric pulse energy voltage to 300v, and the trigger terminal of the square wave ultrasonic pulse transmitter 4 Connect with the trigger terminal of the oscilloscope 6;

[0050] The receiving electrode 2 is connected to the input end of the amplifier 5, the gain of the amplifier 5 is adjusted to 60dB, the output end of the ampli...

Embodiment 2

[0055] This embodiment provides an experimental measurement method of a seismoelectric signal, which is basically the same as the measurement method of Embodiment 1, except that the distance between the receiving electrode 2 and the rock sample 1 is 0 cm during measurement, and remains unchanged. The measurement process Move the excitation transducer 3 in the middle, the moving distance is 1cm each time, and the collection starts when the interface distance between the excitation transducer 3 and the rock sample 1 is 6cm, and the distance between the excitation transducer 3 and the rock sample 1 changes from 6cm to 13cm, and a total of 8 samples are collected. track data.

[0056] After measurement, since the instantaneous high voltage of the excitation source cannot be eliminated when starting, the seismic signal measured in this embodiment also has a sharp pulse at zero time, and the signal that appears after the sharp pulse is the signal required for measurement. The signal...

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Abstract

The invention discloses an experimental measurement method for a seismic-electric signal. The experimental measurement method comprises the following steps: injecting fluid into a water slot; soaking a rock sample, a receiving electrode and an excitation transducer into the fluid in the water slot, wherein the rock sample is a rock sample containing fluid pores; connecting the output end of a square wave ultrasonic pulse emitter to the excitation transducer, and connecting the trigger end of the square wave ultrasonic pulse emitter to the trigger end of an oscilloscope; connecting the input end of the amplifier to the receiving electrode, and connecting the output end of the amplifier to the input end of the oscilloscope; enabling the square wave ultrasonic pulse emitter to provide an electric pulse signal to the excitation transducer, and enabling the oscilloscope to provide a synchronous trigger signal; converting the electric pulse signal into an ultrasonic signal by the excitation transducer; receiving the seismic-electric signal, generated by inducing the rock sample through the ultrasonic signal, via the receiving electrode; amplifying the seismic-electric signal through an amplifier; and detecting and displaying the seismic-electric signal via the oscilloscope. The experimental measurement method can be used for carrying out experimental research on the seismic-electric signal.

Description

technical field [0001] The invention relates to the technical field of geophysical research for oil and gas exploration and development, in particular to an experimental measurement method for seismic electric signals. Background technique [0002] Seismoelectric signals in fluid-bearing porous rocks are generated based on two types of seismoelectric effects. The first type of seismoelectric effect is: when the seismic wave propagates to the fluid-saturated porous medium, a pressure is generated to cause the pore fluid to flow, and the flow of the fluid makes the electric double layer in the rock disturbed, and the disturbance of the electric double layer causes the free mobile charge in the pore fluid There is a relative displacement with the fixed charge, and this net charge flow relative to the skeleton generates an electric field, that is: a resonant electric field. The electrical signal appears in the seismoelectric recording along with the propagation of the sound wav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/023G01N2291/02863
Inventor 丁拼搏彭蓉狄帮让魏建新李向阳
Owner BC P INC CHINA NAT PETROLEUM CORP
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