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Fracture-containing reservoir rock physical modeling method according to fracture space distribution

A technology of petrophysical modeling and fractured reservoirs, applied in geophysical surveying, seismic signal processing, measuring devices, etc., can solve problems such as no rock physical model method

Active Publication Date: 2020-06-12
PETROCHINA CO LTD
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Problems solved by technology

Although many geologists and petroleum engineers have objectively realized that in different fractured reservoirs, the spatial distribution of fractures also presents different characteristics, but the industry currently does not have a petrophysical model that specifically considers the spatial distribution of fractures. method

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  • Fracture-containing reservoir rock physical modeling method according to fracture space distribution
  • Fracture-containing reservoir rock physical modeling method according to fracture space distribution
  • Fracture-containing reservoir rock physical modeling method according to fracture space distribution

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Embodiment Construction

[0026] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0027] Such as figure 1 As shown, the embodiment of the present invention provides a petrophysical modeling method for fracture-containing reservoirs according to the spatial distribution of fractures, including the following steps:

[0028] Step 10, obtaining parameters characterizing the spatial distribution of fractures, and establishing a fracture geological model according to the parameters characterizing the spatial distribution of fractures;

[0029] Step 20, according to the fracture geological model, obtain the elastic stiffness coefficient of the dry rock of the fracture reservoir;

[0030] Step 30, according to the elastic stiffness coefficient of the dry rock in the fractured reserv...

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Abstract

The invention provides a fracture-containing reservoir rock physical modeling method according to fracture spatial distribution, which comprises the following steps: step 10, acquiring parameters representing fracture spatial distribution, and establishing a fracture geological model according to the parameters representing fracture spatial distribution; step 20, acquiring an elastic stiffness coefficient of the fractured reservoir dry rock according to the fracture geological model; step 30, according to the elastic stiffness coefficient of the fractured reservoir dry rock, acquiring the elastic stiffness coefficient of the fractured reservoir saturated by different fluids; step 40, performing Bund conversion on the elastic stiffness coefficient of the fractured reservoir saturated by different fluids to obtain elastic properties and anisotropy of fractures in any direction; and step 50, establishing an elastic velocity and seismic anisotropy model of the fractured reservoir accordingto the elastic properties and anisotropy of the fractures in any direction. The method can effectively represent the influence of the coupling effect of different fracture densities and different fracture spatial distributions on the elastic wave velocity and the seismic anisotropy.

Description

technical field [0001] The invention relates to a petrophysical modeling method for fracture-containing reservoirs based on the spatial distribution of fractures. Background technique [0002] Although fractures only account for a small volume percentage in rocks, they greatly affect the elastic properties and transportation properties of rocks. In tight reservoirs, finding the "sweet spot" of the fracture development area seismically becomes the key to reservoir development, and petrophysical modeling of fractures becomes the basis for seismic evaluation of fracture attributes in tight reservoirs. Most of the early elastic models of cracked media originated from Eshelby's non-interacting inclusion theory. Anderson et al. (1974) applied the Eshelby method to media containing fluid-filled serial elliptical fractures. Cracks can be abstracted as disk-shaped or coin-shaped pores with very small flatness. There are two non-interacting approximations for crack description: one ...

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
CPCG01V1/282G01V1/36
Inventor 杨志芳赵峦啸屠宁曹宏
Owner PETROCHINA CO LTD
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