Digital rock core acoustic characteristic analysis method at different temperatures
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A digital rock core and analysis method technology, applied in the field of rock physics, can solve problems such as differences in the physical properties of rock cores
Pending Publication Date: 2020-09-18
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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[0004] The purpose of the present invention is: to solve the problem that there is a difference between the physical properties of rock cores measured by rock physics experiments at normal temperatures and the physical properties of rock cores...
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Embodiment 1
[0038] Embodiment 1, see attached figure 1 , the method for analyzing the acoustic characteristics of digital rock cores at different temperatures, comprising the following steps:
[0039] A. Construction of multi-component 3D digital cores.
[0040] A1. X-CT scanning equipment is used to scan the core to obtain a tomographic CT image, and reconstruct it to obtain a three-dimensional grayscale digital core.
[0041] A2. Combining QEMSCAN technology to process the three-dimensional grayscale digital core to construct a multi-component (multi-mineral, pore) digital core. The specific methods for processing the three-dimensional grayscale digital core include: representative core analysis, filtering, multi-threshold segmentation, etc.
[0042] B. Calculate the bulk modulus and shear modulus of each component in the digital core at different temperatures.
[0043] In this example, starting from the definition of Anderson-Gruneisen parameters and thermoelastic parameters, the re...
Embodiment 2
[0066] Example 2, on the basis of Example 1, the shale is simulated. During the simulation, the temperature is set at 10°C-400°C, and the simulation is performed every 50°C.
[0067] Such as figure 2 as shown, figure 2 a is a multi-component 3D digital core of shale constructed by X-CT scanning technology combined with QemScan mineral composition testing experiment, which contains pores, kerogen, clay, quartz and iron ore, figure 2 b is the pore space of the shale digital core; for example image 3 As shown in c-f, with the increase of temperature, the bulk modulus, shear modulus and P-s wave velocity will all decrease, but the decrease is not large.
[0068] In this example, shale is taken as an example to carry out numerical simulation of acoustic characteristics at different temperatures. In fact, for any other lithology including hot dry rock, the method proposed by the present invention is feasible.
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Abstract
The invention relates to the technical field of petrophysics, in particular to a rock acoustic characteristic analysis method based on a digital rock core. The invention discloses a digital rock coreacoustic characteristic analysis method at different temperatures. The method comprises the following steps: A, constructing a multi-component three-dimensional digital rock core; B, calculating the bulk modulus and shear modulus of each component in the digital rock core at different temperatures; and C, calculating the stress-strain of the digital rock core by taking the result obtained in the step B as an input parameter, and obtaining the elastic modulus and the sound wave speed through the stress-strain. According to the invention, the construction of the high-resolution digital rock coreis realized, the relationship between the elasticity modulus and the temperature is constructed, and a digital rock core acoustic parameter simulation method at different temperatures is developed. By simulating the elasticity modulus and the sound wave speed of the rock core at different temperatures, the change rule of the temperature on the acoustic characteristics and the electrical characteristics of the rock is analyzed.
Description
technical field [0001] The invention relates to the technical field of rock physics, in particular to a rock acoustic feature analysis method based on a digital rock core. Background technique [0002] Strengthening the research on petrophysical properties such as rock acoustics is the key to improving the accuracy of logging interpretation and effectively developing oil and gas resources and geothermal resources. There are usually high-temperature formations underground, such as hot dry rock formations. The acoustic and electrical characteristics of rocks at high temperatures are quite different from those at normal temperature. The current research method is to use drilling cores, and then use petrophysical experiments to test. In the experiment, the rock needs to be heated to different temperatures, and then the resistivity and velocity analysis instruments are used for measurement. Record the measurement results of sound wave velocity and resistivity at different tempe...
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