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An anisotropic petrophysical calibration method based on the orientation function of shale crystal geometry factors

An anisotropic and geometric factor technology, applied in geophysical surveying, geographic modeling, material analysis using wave/particle radiation, etc., can solve problems such as model errors, well-seismic data mismatch, and seismic wave propagation direction deflection

Active Publication Date: 2022-03-25
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, in the current development of shale gas, these models will produce large errors, resulting in misalignment of well seismic data, etc., making it lose its role as a bridge. The reason is that the rock physical properties of the underground medium will cause seismic waves The propagation direction deflection of , that is, the seismic wave anisotropy
Previous rock physics ignored this phenomenon and considered that the subsurface medium is isotropic, but there will be strong earthquakes in the case of underground natural spaces (cracks, pores, caves, etc.) and their filling fluids and strong anisotropic matrix Anisotropy, which contradicts the assumptions of the original mathematical model

Method used

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  • An anisotropic petrophysical calibration method based on the orientation function of shale crystal geometry factors
  • An anisotropic petrophysical calibration method based on the orientation function of shale crystal geometry factors
  • An anisotropic petrophysical calibration method based on the orientation function of shale crystal geometry factors

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Embodiment Construction

[0014] The shale anisotropic high-temperature and high-pressure petrophysical modeling method includes the following detailed steps in turn:

[0015] Step 1: Using the Voigt-Reuss-Hill average method (one of the synthesis methods), clay, quartz and calcite are synthesized into shale according to the elastic parameters and volume percentages of each mineral.

[0016] The Voigt average is the upper limit of the limit, and it can also be called the equal strain average. It assumes that each component has the same strain, and further gives the ratio of the average stress to the average strain. The formula is:

[0017]

[0018] where M V ——represents the equivalent elastic modulus of N components of the rock;

[0019] m i ——represents the elastic modulus of the i-th component (preferably shear modulus and bulk modulus);

[0020] f i ——Represents the volume content of the i-th component.

[0021] The Reuss average is the lower limit of the limit, and it can also be called th...

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Abstract

An anisotropic petrophysical calibration method based on the orientation function of shale crystal geometric factors. , crystal structure, mathematical modeling and other disciplines, transform logging and core data into compressional and shear wave velocity models, and solve the problem of simulating the equivalent velocity of anisotropic underground media.

Description

technical field [0001] The invention relates to a deep shale oil and gas geophysical exploration technology and method in the field of petroleum and geophysics. The specific technology is to obtain the strongly anisotropic shale velocity based on the anisotropic rock physics model of the shale crystal geometric factor orientation function The method of the model. Background technique [0002] The rock physical model (mud content, porosity, saturation, etc.) is a bridge between logging and seismic data (amplitude, impedance, reflection coefficient, etc.), and it abstracts the physical and chemical relationship between the two parameters into Mathematical models are very important tools in geophysical exploration. Because the logging parameters are detailed, but only single-point data. Seismic data has a wide range, but there are interference factors such as noise, surface undulation, and multiple waves in the data, and it needs to be interpreted before it can be used, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V99/00G01N23/207
CPCG01V99/005G01N23/207
Inventor 黄旭日李浩源徐云贵胡叶正曹卫平唐静
Owner SOUTHWEST PETROLEUM UNIV
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