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Oil-water distribution continuous restoration method for rock CT scanning image

A technology of CT scanning and restoration method, applied in image analysis, image enhancement, image data processing, etc., can solve problems such as rock pore fracture, and achieve the effect of improving calculation accuracy

Pending Publication Date: 2020-10-02
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Application Information

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Problems solved by technology

[0004] The invention aims to solve the problem of rock pore fracture caused by image segmentation, and provides a method for repairing the continuity of oil-water distribution in rock CT scanning images

Method used

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  • Oil-water distribution continuous restoration method for rock CT scanning image
  • Oil-water distribution continuous restoration method for rock CT scanning image
  • Oil-water distribution continuous restoration method for rock CT scanning image

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Embodiment Construction

[0032] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0033] Taking the oil-water distribution continuity restoration of the CT scan image of the Bentheimer sandstone rock sample as an example, the oil-water distribution continuity restoration method of a rock CT scan image proposed by the present invention is illustrated, as figure 1 As shown, it specifically includes the following steps:

[0034] Step 1, reconstruct the three-dimensional space model of the rock;

[0035] Collect typical Bentheimer sandstone rock samples. The porosity of Bentheimer sandstone rock samples is 20.85%. After washing and drying the rock samples, they are immersed in 5% sodium iodide brine solution, so that the Bentheimer sandstone rock samples are saturated with 5% sodium iodide brine solution. , and then use oil to displace the liquid in the rock, so that identifiable oil and water are distribut...

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Abstract

The invention discloses an oil-water distribution continuous restoration method for a rock CT scanning image, and particularly relates to the technical field of rock core analysis and testing. The method comprises: performing CT scanning on a rock sample to obtain a rock image containing oil and water in pores; carrying out image filtering and segmentation processing, and then reconstructing rockthree-dimensional space model; and placing a rock three-dimensional space model in a three-dimensional Cartesian coordinate system, taking an oil phase surface voxel as a center, searching the shortest distance of mutual communication of oil-water two-phase voxels from 26 directions, setting a shortest distance cut-off value, screening an effective search path, replacing skeleton voxels between anoil phase and a water phase with water phase voxels to form a truly communicated rock pore channel, and combining rock wettability to complete continuous repair of oil-water distribution of the CT scanning image. According to the method, rock pore fracture caused by image segmentation is made up, and a foundation is laid for accurately analyzing rock internal fluid space distribution and improving rock electrical parameter and seepage parameter calculation precision.

Description

technical field [0001] The invention relates to the technical field of rock core analysis and testing, in particular to a method for repairing the continuity of oil-water distribution of CT scan images of rocks. Background technique [0002] With the gradual deepening of fine exploration of oil and gas reservoirs in my country, digital rock virtual simulation technology has become a solution to the problems of time-consuming and difficult single-factor analysis in rock physics experiments, and can quickly analyze the pore structure distribution, permeability, elastic parameters, and electrical properties of rocks. An important technical means of attributes such as parameters. Among them, three-dimensional digital core construction and numerical simulation based on CT scanning images are the mainstream methods. [0003] When there are two phases of oil and water in the rock pores, it is necessary to use the image segmentation method to quantitatively determine the oil and wat...

Claims

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Application Information

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IPC IPC(8): G06T17/00G06T7/136G06T5/00
CPCG06T17/00G06T7/136G06T2207/10081G06T2207/10012G06T5/00
Inventor 闫伟超孙天威戈尔萨纳米·纳赛尔董怀民
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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