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Method and system for detecting intersection of cracks in three-dimensional discrete fracture network of tight oil-gas reservoir

A discrete fracture network and intersection detection technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of long running time, large amount of computation, and large system consumption, so as to save computing time and improve detection efficiency effect

Active Publication Date: 2018-01-12
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0004] Therefore, when the number of fracture polygons is large, the running time of crack detailed detection will be very long, and the calculation amount of two-by-two intersection operation is also very large, and the system consumes a lot

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  • Method and system for detecting intersection of cracks in three-dimensional discrete fracture network of tight oil-gas reservoir
  • Method and system for detecting intersection of cracks in three-dimensional discrete fracture network of tight oil-gas reservoir
  • Method and system for detecting intersection of cracks in three-dimensional discrete fracture network of tight oil-gas reservoir

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[0043] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0044] see figure 1 , provides a method for detecting the intersection of fractures in a three-dimensional discrete network of tight oil and gas reservoirs according to an embodiment of the present invention, including: S1, for each fracture polygon in the three-dimensional discrete fracture network, generate a corresponding bounding box, and use the projection method and intersection operation The intersecting bounding box pairs are obtained by filtering with the method, and then the intersecting fracture pairs are preliminarily determined; S2, using the inner product and outer product method to eliminate some disjoint fracture pairs among the initially determined interse...

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Abstract

The present invention provides a method and a system for detecting the intersection of cracks in a three-dimensional discrete fracture network of a tight oil-gas reservoir. The method comprises: for each crack polygon, generating a corresponding bounding box, filtering and obtaining intersected bounding box pairs through a projection method and an intersection algorithm, and initially determiningintersected crack pairs; eliminating a part of non-intersected crack pairs in the initially determined intersected crack pairs by using the inner product outer product method to obtain rough refined intersected crack pairs; and through the intersection point position relationship of two crack polygons, obtaining finely refined intersected crack pairs, and determining the intersection of the intersected crack pairs according to the intersection point position relationship. According to the method and the system provided by the present invention, by using the bounding box, the projection method,the intersection algorithm and the like, intersected crack pairs are initially determined, and obvious non-intersected crack pairs are filtered out, so that for understanding the intersection of thecracks in the three-dimensional discrete crack network of the tight oil-gas reservoir, a large quantity of computing time is saved, and the detection efficiency of the intersection of cracks is improved.

Description

technical field [0001] The invention relates to the technical field of fracture intersection detection, in particular to a method and system for detecting fracture intersections in a three-dimensional discrete network of tight oil and gas reservoirs. Background technique [0002] 3D crack intersection detection is a special type of collision detection. Usually, collision detection can be divided into collision detection based on time domain and collision detection based on space domain. 3D crack intersection detection belongs to static collision detection based on control domain. Tight oil and gas reservoir fracture intersection detection is one of the important means in the field of tight oil and gas reservoir connectivity analysis. [0003] At present, for the method of three-dimensional fracture intersection, the conventional method is to use the exhaustive method, that is, to perform two-by-two intersection operations on all fracture polygons in the three-dimensional dis...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 董少群曾联波王圣娇吕文雅
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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