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Micro-seismic event detection method and system based on chi-square distribution

A chi-square distribution and event detection technology, applied in the petroleum field, can solve the problems of algorithm performance impact and lack of unity, and achieve the effect of simple calculation and good robustness

Active Publication Date: 2019-10-22
GUANGDONG UNIV OF PETROCHEMICAL TECH
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Problems solved by technology

[0007] In common microseismic event detection methods and systems, there is no unified criterion, and its universal applicability has great limitations, especially when the signal-to-noise ratio is low, the performance of the algorithm is greatly affected

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] figure 1 Schematic diagram of a chi-square distribution-based microseismic event detection method

[0026] figure 1 It is a schematic flowchart of a chi-square distribution-based microseismic event...

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Abstract

The embodiment of the invention discloses a micro-seismic event detection method and system based on chi-square distribution. The method comprises the following steps: S1, inputting a measured micro-seismic signal sequence S; and S2, judging a micro-seismic event according to the chi-square statistics gamma<K><2> of the micro-seismic signal sequence S. Specifically, a micro-seismic event is detected at a point K of the micro-seismic signal sequence S if the chi-square statistics gamma<K><2> is greater than or equal to gamma<alpha><2>, otherwise, no micro-seismic event is detected, wherein gamma<alpha><2> is a judgment threshold, and alpha is an F distribution parameter.

Description

technical field [0001] The invention relates to the petroleum field, in particular to a method and system for detecting microseismic events. Background technique [0002] Hydraulic fracturing microseismic monitoring technology is an important new technology developed in the fields of low permeability reservoir fracturing, reservoir driving and water flooding front in recent years, and it is also an important supporting technology for shale gas development. This technology arranges a multi-level three-component geophone arrangement in adjacent wells to monitor the microseismic events generated in the hydraulic fracturing process of the target interval of the fracturing well, and inverts the microseismic events to obtain parameters such as the source position, so as to describe the hydraulic fracturing The geometry and spatial distribution of fracture growth during the process provide real-time information on the length, height, width and orientation of fractures produced by h...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/288G01V1/306
Inventor 翟明岳
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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