A 2D model construction method reflecting real core connectivity
A real core and construction method technology, applied in 2D image generation, image data processing, instruments, etc., can solve the problems of long time-consuming numerical simulation, large-scale grid model, denudation, separation, aggregation and so on, to achieve guaranteed Reliability and accuracy, high similarity, good planar connectivity
Active Publication Date: 2018-06-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
Due to the complex shape of the boundary of the pore-throat space, the workload of grid subdivision is heavy, and the scale of the grid model is large, the later numerical simulation takes a long time, which cannot meet the needs of conventional microscopic numerical simulation calculations
Moreover, the pore-throat space plane and vertical cross-connection of the three-dimensional pore model, the process of fluid denudation, separation, coalescence and other processes in the pores are many, it is difficult to intuitively track the flow form of the fluid, and analyze the mechanism of the microscopic distribution of remaining oil
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[0027] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.
[0028] Such as figure 1 as shown, figure 1 It is a flow chart of the 2D model construction method reflecting real core connectivity of the present invention.
[0029] In step 101, the core microscopic pore structure image is preprocessed. First, a scanned image is selected as the model construction object, and the construction area is composed of many rock skeletons and pore spaces. According to the gray value of the image, the pores and the skeleton are segmented, and the processed image becomes a binary image of (0,1). Such as figure 2 , the white area is the rock skeleton, and the black area is the pore. The process goes to step 102.
[0030] In step 102, an autocorrelation function is established. Define the relationship between the i...
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The invention provides a method for constructing a 2D model that reflects the connectivity of real rock cores. The method includes: step 1, performing preprocessing of the microscopic pore structure image of the rock core; step 2, establishing an autocorrelation function; Pore structure image and autocorrelation function, construct image autocorrelation function and distance curve; step 4, apply autocorrelation function from the plane to determine the model scale standard with the representativeness of core pore structure characteristics, thereby determine the plane range of the two-dimensional model; step 5. Determine the maximum penetration depth of longitudinal pores; Step 6, perform longitudinal pore structure mapping; and Step 7, remove isolated pores, and establish a simulation model reflecting the characteristics and connectivity of real core pore structures. The 2D model construction method reflecting the real core connectivity ensures the reliability and accuracy of the microscopic flow simulation inside the core, and provides a reasonable reference for truly reflecting the microscopic oil-water seepage mechanism.
Description
technical field [0001] The invention relates to the technical field of oil field development, in particular to a method for constructing a 2D model reflecting real rock core connectivity. Background technique [0002] The three-dimensional pore-scale microcosmic numerical simulation model is based on real core scanning images, identifying the complex pore-throat space inside the core, and constructing it after finely meshing. Due to the complex shape of the boundary of the pore-throat space, the workload of grid subdivision is heavy, and the scale of the grid model is large, the later numerical simulation takes a long time, which cannot meet the needs of conventional microscopic numerical simulation calculations. Moreover, the pore-throat spatial plane and vertical cross-connection of the three-dimensional pore model, the process of fluid denudation, separation, coalescence and other processes in the pores are many, it is difficult to intuitively track the flow form of the f...
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IPC IPC(8): G06T11/00G06T7/187
Inventor 孙红霞戴涛汪勇徐冬梅苏海波孟薇赵莹莹闫萍韩子臣陈苏段敏曹伟东史敬华
Owner CHINA PETROLEUM & CHEM CORP