Method for constructing hydraulic fracturing fracture space seam net by utilizing microseism event points

Abstract

The invention provides a method for constructing a hydraulic fracturing fracture space seam net by utilizing microseism event points. The method comprises the following steps of 1, carrying out regional stress field research by utilizing a three-dimensional seismic fine structure interpretation result of a target layer and combining regional structure evolution of a local region; 2, describing natural fracture distribution of the target layer by utilizing curvature analysis, coherence analysis and azimuth anisotropy analysis methods; and 3, in combination with regional stress field characteristics and the natural fracture distribution, constructing a hydraulic fracturing fracture space seam net by utilizing a time sequence and a space distribution position of the microseism event points. According to the method, when the microseism event points are used for constructing the hydraulic fracturing fracture space seam net, the regional stress field and the natural fracture distribution areconsidered, the time sequence and the space distribution position of the microseism event points in a fracturing construction process are also considered, seam net interpretation is more reasonable,and fracturing effect evaluation is more scientific.

Description

technical field [0001] The invention relates to the field of unconventional oil and gas development, and relates to a method for constructing a spatial fracture network of hydraulic fracturing fractures by using microseismic event points. Background technique [0002] Microseismic monitoring is a reservoir dynamic monitoring method that directly monitors activities such as underground fluid flow, fracture generation, or formation rupture by monitoring the weak seismic signals released by changes in the reservoir. In the fracturing process of unconventional oil and gas reservoirs, microseismic monitoring and combined seismic and geological interpretation of microseismic event points are the main means to evaluate fracturing effects. At present, the distribution characteristics of microseismic event points are mainly used to calculate the length, height, width, azimuth, inclination, and reservoir fracturing volume and other parameters of artificial fracturing fractures, and th...

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Problems solved by technology

This method can roughly describe the orientation of fractures, but there are three problems in the description process: ① When describing the relationship between microseismic event points, the planar top view projection is used, and two points that are close to each other on the planar projection may not be in space. ②The fracture surface represented by the connection line between the two points described by the top view projection is not unique in the three-dimensional space; ③The connected microseismic event points are only determined to be the same fracture according to the orientation of the artificial fracture. very poor explanation

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