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Dual-medium carbonate rock pore-crack dual-network model construction method

A pore network model, carbonate rock technology, applied in 3D modeling, suspension and porous material analysis, image data processing, etc. Mechanism understanding and data support, the effect of improving calculation speed

Active Publication Date: 2020-02-28
科吉思石油技术咨询(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The previous pore network model construction method was mainly used in porous media, and due to the continuity of the fracture space and the broadness of the three-dimensional expansion, the conventional modeling method will lose some information and cannot accurately capture the real three-dimensional topology of the fracture.
In addition, for dual-media carbonate rocks with pores and fractures developed at the same time, there is fluid exchange between pores and fractures, and there are obviously certain errors in the simultaneous characterization of the two with a set of network models, which will affect later research and analysis.

Method used

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  • Dual-medium carbonate rock pore-crack dual-network model construction method
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  • Dual-medium carbonate rock pore-crack dual-network model construction method

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Embodiment 1

[0059] This embodiment provides a dual-medium carbonate rock pore-fracture dual network model construction method, such as figure 1 Shown:

[0060] Include the following steps:

[0061] Step 1: Use micro-CT to scan the dual-media carbonate sample to obtain a non-destructive three-dimensional image of the real sample.

[0062] Step 2: Using image segmentation technology to extract the space of pores and fractures from the 3D image obtained in Step 1. Since the pores and fractures are extracted as the same phase at this time, it is necessary to further separate the two to achieve the purpose of building a network model separately.

[0063] Step 3: Perform morphological analysis on the pore and fracture space extracted in step 2, calculate the three-dimensional length and three-dimensional minimum width information of each pore / fracture, and divide the pores and fractures by the ratio of the two.

[0064] Step 4: For the fracture space separated in step 3, first use the center...

Embodiment 2

[0069] As an optimization of the above embodiment, the distinction between the pore space and the fracture space can be effectively separated by calculating the ratio of the three-dimensional length and the three-dimensional minimum width of the pores and fractures, and selecting an appropriate threshold. Three-dimensional length measurement is to place each pore / fracture such as Figure 5 In the coordinate system shown, take 18 degrees as a step along the θ and φ directions respectively, search from 0 degrees to 162 degrees, and record the distance between the beginning and the end of each step, and the largest distance is the three-dimensional length. Two parallel planes made in the three-dimensional length direction and in contact with the edge of the pores / cracks are rotated around the three-dimensional length direction, and the minimum distance between the two planes is the three-dimensional minimum width. Since the fracture is flat, the ratio of its three-dimensional len...

Embodiment 3

[0071] As an optimization of the above embodiment, when constructing the network model of the fracture space separated in step 3, the following operations are sequentially adopted to obtain the fracture network model:

[0072] 1. Extraction of the center line: First, a value is given to each voxel of the digital core model of the fracture, which is the distance from the voxel to the nearest rock skeleton; then, the digital core model of the fracture is continuously refined according to the distance map. until a continuous chain of voxels remains, such as Figure 7 As shown in , the voxel chain is the extracted centerline of the fracture.

[0073] 2. Taking each centerline voxel on the centerline as the basic point, first use the expansion algorithm to determine the possible search space. After finding the range of the skeleton voxel closest to each voxel, the shrinkage algorithm is used to identify the inscribed sphere corresponding to the central voxel; finally, the upper an...

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Abstract

The invention relates to the technical field of oil and gas development, in particular to a dual-medium carbonate rock pore-fracture dual-network model construction method. The method comprises the following steps: scanning a dual-medium carbonate rock sample to obtain a three-dimensional image; performing image segmentation processing on the three-dimensional image, and extracting a to-be-identified space; performing morphological analysis on the to-be-identified space, and completing separation of a pore space and a crack space according to a morphological analysis result; respectively carrying out network model construction on the separated pore space and crack space by adopting a sphere filling method to obtain a pore network model and a crack network model; and adding a communicationthroat between the pore network model and the crack network model to complete construction of a pore-crack dual-network model. According to the method, when the dual-medium carbonate rock network model is constructed, the pore network model and the crack network model can be accurately constructed, and meanwhile, the pore network model and the crack network model are fused into the pore-crack dual-network model.

Description

technical field [0001] The invention relates to the technical field of oil and gas development, in particular to a method for constructing a double-medium carbonate rock pore-fracture double network model. Background technique [0002] With the increasing intensity of exploration and development in my country, the types of oil and gas reservoirs encountered are becoming more and more complex, especially the proven reserves of pore-fracture carbonate gas reservoirs are increasing. Pore-fractured carbonate gas reservoirs are different from conventional sandstone gas reservoirs. Due to the existence of a large number of natural fractures inside, a dual medium system of fractures and pores is formed, which makes its seepage characteristics and fluid exchange relations more complicated. The program is more difficult. [0003] For the study of the seepage characteristics of carbonate rocks with fractures and pores simultaneously developed, the usual practice is to construct fract...

Claims

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Application Information

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IPC IPC(8): G06T17/00G06T7/11G06T7/62G01N15/08
CPCG06T17/00G06T7/11G06T7/62G01N15/088G06T2207/10081G06T2200/08
Inventor 王寅袁雯明治良刘义
Owner 科吉思石油技术咨询(北京)有限公司
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