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Method for evaluating permeability of reservoir layer according to interval transit time and density inversed pore flat degree

A technology of density inversion and acoustic time difference, which is applied in earthwork drilling, seismology for logging records, surveying, etc.

Active Publication Date: 2011-06-15
PETROCHINA CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

One point of view, such as the critical porosity model and the Krief model, generally holds that the modulus ratio of the dry rock matrix is ​​generally considered to be constant regardless of porosity, that is, the ratio of the P-wave velocity of the dry-rock matrix to the P-wave velocity of the rock matrix ratios are equal, but this assumption is sometimes inconsistent with laboratory measurements

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  • Method for evaluating permeability of reservoir layer according to interval transit time and density inversed pore flat degree
  • Method for evaluating permeability of reservoir layer according to interval transit time and density inversed pore flat degree
  • Method for evaluating permeability of reservoir layer according to interval transit time and density inversed pore flat degree

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Embodiment Construction

[0046] Figure 2 shows the petrophysical skeleton modeling results of an oil well in the North Sea. The well is a reservoir at 2033-2116m, of which 2033-2051m is an oil layer, and 2051-2116m is an oil-water layer. Figure 2a are the longitudinal, shear wave, density, porosity, shale content and oil saturation curves of the reservoir section; Figure 2b is the bulk modulus and shear modulus of saturated rock calculated from compressional and shear waves and density; Figure 2c Pore ​​flatness data inverted for P-wave data; Figure 2d for the reason Figure 2c The ratio curve of the bulk modulus to the shear modulus of the dry rock skeleton calculated from the pore flatness. Figure 2e for the reason Figure 2c The bulk modulus and shear modulus curves of the dry rock skeleton calculated from the pore flatness. Figure 2f for the reason Figure 2c The bulk modulus of saturated rock calculated from the pore flatness, and the shear modulus of saturated rock is the same as that...

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Abstract

The invention relates to a method for evaluating the permeability of a reservoir layer according to the interval transit time and density inversed pore flat degree, comprising the following steps: collecting the characteristics and physical property parameters of rock; calculating the bulk modulus and shear modulus of saturated rock; calculating the bulk modulus and shear modulus of a rock substrate and the bulk modulus of fluid; setting the initial flat degree of the pores; calculating the change relation of the modulus ratio of a dry rock skeleton along with the porosity; calculating the bulk modulus and shear modulus of the dry rock skeleton; calculating the bulk modulus and shear modulus of fluid saturated rock; comparing the bulk modulus and shear modulus obtained through forward calculation with the bulk modulus and shear modulus actually measured, and calculating the error between the bulk modulus and shear modulus obtained through forward calculation and the bulk modulus and shear modulus actually measured; and modifying the set pore flat degree by adopting a nonlinear global optimizing algorithm, and using the pore flat degree for speed prediction, fluid substitution, inversion of porosity and saturated degree and logging parameter evaluation after accurate moduli of the dry rock skeleton are obtained.

Description

technical field [0001] The invention relates to the field of geophysics, and relates to a method for evaluating reservoir permeability based on acoustic time difference and density inversion of pore flatness. Background technique [0002] Seismic rock physics is a basic analysis tool for geophysical hydrocarbon detection, reservoir description and amplitude interpretation, etc. It builds a bridge between seismic data and petrophysical properties and reservoir properties. The Gassmann equation is one of the most commonly used theoretical equations in seismic rock physics. It is usually used to study the influence of saturated fluid on the seismic characteristics of rocks and describe the relationship between seismic response and rock physical properties. The Gassmann equation points out that the bulk modulus of fluid-saturated rock can be jointly determined by the bulk modulus of the dry rock skeleton, the bulk modulus of the rock matrix, the bulk modulus of the pore fluid, a...

Claims

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Application Information

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IPC IPC(8): G01V1/40E21B49/00E21B47/18
Inventor 李红兵张佳佳
Owner PETROCHINA CO LTD
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