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Microseismic event detecting method and system based on relative amplitude change

A relative change and event detection technology, applied in the oil field, can solve the problems of lack of uniformity and algorithm performance impact, and achieve the effect of good robustness and simple calculation.

Inactive Publication Date: 2019-08-20
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the common microseismic event detection methods, the determination of the judgment threshold is relatively random, there is no unified criterion, and its general 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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  • Microseismic event detecting method and system based on relative amplitude change
  • Microseismic event detecting method and system based on relative amplitude change
  • Microseismic event detecting method and system based on relative amplitude change

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only some, not all, embodiments of the present invention. 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 flow chart of the microseismic event detection method based on the relative change of amplitude

[0026] figure 1 It is a schematic flow chart of the present invention. Such as fi...

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Abstract

The embodiment of the invention discloses a microseismic event detecting method and system based on relative amplitude change. The method comprises the steps that 1 a measured microseismic signal sequence S is input; 2 a microseismic event is detected according to the relative change coefficient of amplitudes; specifically, if a microseismic event occurs at the Kth point of the microseismic signalsequence S, otherwise no microseismic event occurs; lambda K is the relative change coefficient of the amplitude of the microseismic signal sequence S at the Kth point; sigma is the variance of the microseismic signal sequence S; max[S] is the maximum value of all elements in the microseismic signal sequence S; D is the length of a window sequence; xk is the relative change value of the ith amplitude in the window sequence corresponding to the Kth element in the microseismic signal sequence S; and the average value of xk is the average value of the relative change values of the amplitudesin the window sequence corresponding to the Kth element in the microseismic signal sequence S.

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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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/288G01V1/307
Inventor 翟明岳
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH