Method and system for testing low-frequency elastic modulus and attenuation coefficient of rock
A technique of attenuation coefficient and elastic modulus, applied in the field of petrophysical research, can solve the problems of long time and low measurement efficiency
Active Publication Date: 2018-07-17
PETROCHINA CO LTD
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[0004] However, the existing technology using the stress-strain principle can only measure a single frequency point at a time, and in actual measurement, it is generally necessary to measure multiple frequency points to draw a petrophysical characteristic curve. The method will take a long time, resulting in extremely low measurement efficiency
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[0067] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0068] The rock low-frequency elastic modulus and attenuation coefficient measurement system of the embodiment of the present application may include a host computer, a terminal device, a piezoelectric sheet used as a seismic source, and a strain sensor set on a rock sample to be tested and a reference standard sample. Wherein, the upper ...
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The embodiment of the invention provides a method and a system for testing low-frequency elastic modulus and attenuation coefficients of rock. The method comprises the following steps: selecting N frequency points from a preset frequency range, dividing the N frequency points into L frequency bands, and correspondingly generating a first harmonic excitation signal of each frequency band accordingto frequency points in each frequency band; sequentially exerting the first harmonic excitation signals of each frequency band to a piezoelectric plate to cause strain of a tested rock sample and strain of a reference standard sample, and acquiring a first strain electric signal of the tested rock sample and a second strain electric signal of the reference standard sample; according to corresponding first strain electric signals and second strain electric signals corresponding to each frequency band, confirming Young modulus, Poisson's ratios and attenuation coefficients of the tested rock sample in each frequency band. By adopting the embodiment of the invention, the measurement efficiency on low-frequency elastic modulus and attenuation coefficients of rock can be improved.
Description
technical field [0001] The present application relates to the technical field of rock physics research, in particular to a method and system for measuring rock low-frequency elastic modulus and attenuation coefficient. Background technique [0002] Petrophysical experiments are the most direct way to establish the relationship between seismic elastic parameters and reservoir parameters, and play an increasingly important role in seismic reservoir prediction and hydrocarbon detection. Due to the significant difference between the velocity in the seismic frequency band (with a center frequency of tens of Hz) and the velocity of logging (with a center frequency of 20 kHz) and ultrasonic waves (with a center frequency of 1 MHz), it is risky to directly use medium and high frequency data to explain the exploration problems in the seismic frequency band , the measurement and analysis of seismic velocity and attenuation under the conditions of low seismic frequency and weak amplitu...
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Login to View More IPC IPC(8): G01N3/38
CPCG01N3/38G01N2203/0051G01N2203/0075
Inventor 杨志芳周凯波曹宏张硕晏信飞曾玲李晓明
Owner PETROCHINA CO LTD