Curvature characterization method suitable for complex seepage space body of crack

Abstract

The invention discloses a curvature characterization method suitable for a complex seepage space body of a crack, and relates to the technical field of oil and gas development. The method comprises the following steps of: obtaining three-dimensional data of a surface A and a surface B of a rock core crack; enabling a complex space body formed by the surface A and the surface B to be equivalent toa space body formed by a smooth plane A' and a complex curved surface B'; and taking any point G (i, j) on the complex curved surface B', building a 7 * 7 standard grid, obtaining the average curvature k (i, j) of the point G (i, j) in four directions, obtaining the curvature of the complex curved surface B', and obtaining the curvature of the complex seepage space body. The method employs the 7 *7 standard grid to calculate the curvatures of the three-dimensional data points of the complex curved surface B' in four directions, and gives different weights to the curvatures of each three-dimensional data point in each direction at different distances to calculate the average curvature of each three-dimensional data point, thereby improving the precision of curvature characterization of thethree-dimensional data points in the complex curved surface B'.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a curvature characterization method suitable for complex seepage space bodies in fractures. Background technique [0002] Carbonate reservoirs have large oil and gas reserves, containing about 48% of the world's crude oil reserves and 28% of natural gas reserves, and have high single well production, which has attracted increasing attention in the world's oil and gas industry. However, the heterogeneity of carbonate reservoirs is extremely strong, the oil and gas reservoirs are discontinuous, and the probability of connecting reservoirs through boreholes is small. Therefore, the use of acid fracturing technology to create fractures and effectively communicate natural fractures and reservoirs in far-well areas has become one of the key technologies for the exploitation, production establishment, production stabilization and production increase of carbonate re...

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to overcome the problem in the prior art that the curvature of complex space bodies such as acid-etched fractures is difficult to accurately characterize, to provide a curvature characterization method suitable for complex seepage space bodies in fractures, and to realize the accurate characterization of curvature of complex space bodies

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