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Method for predicting fluid activity of oil and gas reservoir

A prediction method and technology for oil and gas reservoirs, which are used in earth-moving drilling, special data processing applications, complex mathematical operations, etc., can solve the problems of unclear petrophysical meaning and low inversion accuracy, and achieve reliable results and clear physical meaning. , the effect of improving reliability

Active Publication Date: 2018-12-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] Existing methods for calculating fluid mobility are based on the simplified asymptotic representation theory of seismic signal reflection in fluid-saturated porous media in the low-frequency domain. Time-frequency analysis is used to calculate fluid activity properties. The petrophysical significance of this method is not clear. And the inversion accuracy is low

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  • Method for predicting fluid activity of oil and gas reservoir
  • Method for predicting fluid activity of oil and gas reservoir
  • Method for predicting fluid activity of oil and gas reservoir

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0032] The existing fluid activity calculation method is as follows:

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039] In the formula, R is the reflection coefficient, F is the fluid activity; ρ f is fluid density; ω is seismic wave angular frequency; R 0 , R 1 are the zero-order and first-order terms of the asymptotic expression of the reflection coefficient, respectively, and are functions related to the properties of reservoir rock and fluid; C is a complex function defined. From the above formula, it can be seen that the reservoir fluid activity is proportional to the first derivative of the reflection coefficient when the frequency is ω. Af...

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Abstract

The invention relates to the technical field of exploration and development, and particularly discloses a method for predicting the fluid activity of an oil and gas reservoir. The method for predicting the fluid activity of the oil and gas reservoir comprises the steps that step 1, a linear approximate expression of a reflection coefficient is obtained; step 2, frequency division processing is carried out; step 3, a regrouped forward calculation operator is obtained; and step 4, an objective function is constructed under a Bayesian framework, specifically, a sparse regularization term and a low-frequency model constraint term which are introduced by prior probability distribution are added, finally, an objective functional is obtained, the gradient of a model parameter F is obtained by using the objective functional and is set as 0, a final nonlinear inversion equation of the model parameter is obtained, the value of F is evaluated by using a least square method, and a fluid activity value is obtained. The method is a frequency-dependent inversion prediction method for the fluid activity under a Bayesian theory framework, the reliability of reservoir prediction and fluid identification can be improved, so that the physical significance of calculating the fluid activity is clearer and the result is more reliable.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a calculation method for fluid activity of oil and gas reservoirs. Background technique [0002] The fluid activity of oil and gas reservoirs is defined as the ratio of the permeability of the reservoir to the fluid viscosity coefficient, which reflects the joint effect of the permeability (or connectivity) of the pore structure in the rock framework of the reservoir and the type and viscosity of the pore fluid. , therefore, reservoir fluid activity is of great significance for determining the elastic parameters, internal structure and fluid-bearing properties of reservoir rocks. Application examples at home and abroad show that compared with conventional seismic data and inversion profiles, only static parameters of reservoirs can be predicted, and fluid activity can better reflect the quality of reservoirs, effectively predicting high-quality res...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00G06F17/50G06F17/10
CPCE21B49/00G06F17/10G06F30/20
Inventor 李福来卢莉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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