Dynamic estimation method for P-wave and S-wave velocities in carbon dioxide flooding process

A technology of oil displacement process, carbon dioxide, applied in the field of exploration geophysics

Inactive Publication Date: 2016-12-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The P- and S-wave velocities estimated by this method are static, suitable for estimation before displacement, but not for estimation of P- and S-wave after displacement

Method used

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  • Dynamic estimation method for P-wave and S-wave velocities in carbon dioxide flooding process
  • Dynamic estimation method for P-wave and S-wave velocities in carbon dioxide flooding process
  • Dynamic estimation method for P-wave and S-wave velocities in carbon dioxide flooding process

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Embodiment Construction

[0031] According to the actual situation of the work area, a suitable model is selected, and the applicability of the model is verified by using the traditional method to estimate the compression and shear waves before displacement. The Xu-White model comprehensively considers the influence of matrix properties, shale content, porosity size and pore shape in rocks, and the properties of fluid contained in pores on velocity, and the physical meaning of this model is clear.

[0032] like figure 1 as shown, figure 1 It is a flow chart of the dynamic estimation method of compressional and shear wave velocity in the carbon dioxide flooding process of the present invention.

[0033] Step 101 , affected by the injection of carbon dioxide, not only the fluid inside the reservoir will change, but also the porosity and pore shape of the reservoir will change accordingly, resulting in a change in rock elastic modulus. The total porosity of the rock after carbon dioxide displacement can...

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Abstract

The invention provides a dynamic estimation method for P-wave and S-wave velocities in a carbon dioxide flooding process. The method comprises the following steps: acquiring a total porosity and a pore aspect ratio after displacement by using existing base data and experimental data; acquiring bulk moduli and shear moduli of rock matrixes which are different in oil-gas-water contents by using a K-T equation respectively; building wave impedance volume versions with different oil-gas-water saturation degrees based on the experimental data and seismic data; calculating a mixed fluid bulk modulus and a mixed fluid density in secondary seismic acquisition; acquiring densities, the bulk moduli and the shear moduli of the rock matrixes in the secondary seismic acquisition by using a change formula of the porosity and the pore aspect ratio under the influence of a pressure; and acquiring the P-wave and S-wave velocities in seismic acquisition by using a Xu-White model. Through adoption of the dynamic estimation method for the P-wave and S-wave velocities in the carbon dioxide flooding process, a model is improved by a changed porosity and a changed pore aspect ratio, so that the P-wave and S-wave velocity prediction accuracy is increased, and dynamic estimation of the P-wave and S-wave velocities in the carbon dioxide flooding process is realized.

Description

technical field [0001] The invention relates to the field of exploration geophysics, in particular to a method for dynamically estimating the velocity of compressional and shear waves in the process of carbon dioxide flooding. Background technique [0002] The traditional compressional and shear wave prediction methods are based on conventional logging, core and test data. Through logging constraints, different petrophysical models are used to obtain the elastic modulus of the rock skeleton, combined with the Gassmann equation, and the pore fluid properties and saturation are used to estimate the compressional and shear wave velocity. The P- and S-wave velocities estimated by this method are static and suitable for pre-displacement estimation, but not for post-displacement P- and S-wave velocities. For this reason, we invented a new dynamic estimation method of compressional and shear wave velocity in the process of carbon dioxide flooding, which solved the above technical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 亓亮谭明友张云银崔世凌曲志鹏雷蕾张伟忠谢伟徐元刚李姝丽
Owner CHINA PETROLEUM & CHEM CORP
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