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Anisotropic rock physical modeling method for deep shale at high temperature and high pressure

A petrophysical modeling, anisotropy technique used in petroleum and geophysics

Inactive Publication Date: 2019-11-19
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

It can be seen from this that for the simulation of high temperature and high pressure conditions in deep layers, the existing rock experiment simulation instruments have huge limitations

Method used

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  • Anisotropic rock physical modeling method for deep shale at high temperature and high pressure
  • Anisotropic rock physical modeling method for deep shale at high temperature and high pressure
  • Anisotropic rock physical modeling method for deep shale at high temperature and high pressure

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Experimental program
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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 rock physical modeling method for deep shale at high temperature and high pressure is provided. The core of the method is an anisotropic rock physical modeling method combining variousanisotropic rock physical models with a high-temperature and high-pressure correction model. The method is based on multiple disciplines such as petrophysics, mathematical modeling and geophysics. Well logging and rock core data are converted into a longitudinal and transverse wave velocity model. The problem of simulation of the equivalent velocity of an anisotropic medium in an underground deephigh-temperature and high-pressure environment is solved.

Description

technical field [0001] The invention relates to a geophysical exploration technology method for deep shale oil and gas in the field of petroleum and geophysics. The specific technology is a method for obtaining a deep shale velocity model based on an anisotropic rock physics model and a temperature coefficient and a pressure coefficient. Background technique [0002] The petrophysical model is to use the mathematical model and empirical formula to equate the underground lithology parameters (mud content, porosity, saturation, etc.) obtained from logging and cores into the velocity and seismic properties of the medium (amplitude, impedance, reflection coefficient, etc. ). The petrophysical model can effectively combine the data obtained from well logging, core and seismic to jointly explain the condition of the underground medium. The anisotropic rock physics model in the rock physics model is based on the conventional rock physics model, taking into account the cracks and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V99/00
CPCG01V20/00
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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