Characterization method of matrix-fracture coupling in fractured carbonate rocks

A carbonate rock and matrix technology, applied in earthwork drilling, wellbore/well components, etc., can solve the problems of not considering the coupling effect of fractures and matrix, and reducing the accuracy of reservoir evaluation

Active Publication Date: 2020-05-12
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Applying these theoretical models to logging interpretation will reduce the accuracy of reservoir evaluation because the coupling between fractures and matrix is ​​not considered

Method used

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  • Characterization method of matrix-fracture coupling in fractured carbonate rocks
  • Characterization method of matrix-fracture coupling in fractured carbonate rocks
  • Characterization method of matrix-fracture coupling in fractured carbonate rocks

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Embodiment Construction

[0035] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0036] Such as figure 1 as shown, figure 1 It is a flow chart of the characterization method for coupling action between fractured carbonate rock matrix and fractures of the present invention. Firstly, flat plate fracture models with different fracture openings are constructed, and applied to the CT-scanned carbonate matrix digital core to construct a 3D digital core of fractured carbonate rock, and then the lattice Boltzmann method is used to simulate the digital core constructed above The seepage field distribution and permeability are calculated, and finally the permeability coupling coefficient is introduced to analyze the permeability results and determine the expression of the permeability coupling coefficient. Specific steps are as follo...

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Abstract

The invention provides a fractured carbonate rock matrix and crack coupling action characterization method. The fractured carbonate rock matrix and crack coupling action characterization method comprises the steps that 1, a flat plate crack model with different crack open degrees is constructed; 2, the flat plate crack model with the different crack open degrees is applied to a CT scanning carbonate rock matrix digital rock core, and a fractured carbonate rock three-dimensional digital rock core is constructed; 3, the distribution of a seepage field of the three-dimensional digital rock core is simulated through the lattice Boltzmann method, and the permeability of a three-dimensional digital rock core model is calculated; and 4, the permeability coupling coefficient is introduced, the permeability result is analyzed, and the permeability coupling coefficient expression is determined. According to the fractured carbonate rock matrix and crack coupling action characterization method, the problem that the total permeability is affected by the fractured carbonate rock seepage coupling action is solved, the flowing capacity of carbonate rock fractured reservoir fluid is reflected more realistically, and a help is provided for well logging, reservoir evaluation and oilfield development.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a characterization method for the coupling effect of fractured carbonate rock matrix and fractures. Background technique [0002] With the continuous deepening of exploration and development in my country, the types of newly proven oil reservoirs have become more and more complex in recent years, especially the proven reserves of fractured oil reservoirs have continued to increase. Due to the existence of natural fractures, fractured carbonate reservoirs constitute dual-media reservoirs. In exploration and development, the permeability parameters of fractured carbonate reservoirs are of great significance to the evaluation and interpretation of the entire reservoir. [0003] The pore space of fractured carbonate reservoirs is composed of primary intergranular pores and secondary fractures. The definition of permeability of fractured carbonate reservoirs is consistent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 乌洪翠张丽艳孙建孟闫伟超隋淑玲杜玉山赵国欣王筱文王伟巴志明
Owner CHINA PETROLEUM & CHEM CORP
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