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Gasification cavity boundary identification method

A boundary identification and gasification chamber technology, applied in seismology, instruments, measuring devices, etc., can solve problems such as errors and achieve the effect of preventing coal seam roof collapse

Active Publication Date: 2021-06-25
OPTICAL SCI & TECH (CHENGDU) LTD
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Problems solved by technology

The survey shows that foreign scholars are based on theoretical models for research and simulation, and the gasification cavity obtained is too idealized, and there are errors. The use of microseismic monitoring technology can effectively describe the real gasification cavity shape in real time. There are no research results on identifying gasification boundaries using microseismic event attributes

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Embodiment Construction

[0023] The purpose of the present invention is to extract and quantify the energy attribute of the micro-seismic event through the effectively located micro-seismic event, and finally identify the boundary range of the underground coal gasification. The specific implementation method is as follows.

[0024] S1. Multi-wave joint positioning algorithm for micro-seismic event positioning

[0025] The multi-wave joint positioning algorithm is to use high signal-to-noise ratio signals to locate microseismic events in real time. The vibration direction of the microseismic event is determined, and then the P, S h , S v Momentity and corrected velocity models determine the spatial location of microseismic events produced by coal combustion.

[0026] Let the coordinates of the source location of the kth event be Q k (x qk ,y qk ,z qk ), the coordinates of the i-th detector are P i (x pi ,y pi ,z pi ), then the distance between the source and the observation point is:

[002...

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Abstract

The invention provides a gasification cavity boundary identification method. The gasification cavity boundary identification method comprises the following steps: S1, carrying out microseism event positioning through a multi-wave joint positioning algorithm; S2, extracting the energy attribute of the microseism event; S3, identifying the boundary of the underground raw coal gasification cavity. According to the gasification cavity boundary identification method, the microseism event wave and range generated by coal combustion gasification can be solved, the gasification boundary range can be identified, and the gasification cavity space boundary range can be identified and researched based on the result.

Description

technical field [0001] The invention relates to a method for processing microseismic data in geophysical exploration, in particular to a gasification cavity boundary identification method. Background technique [0002] In recent years, underground coal gasification has been effectively developed. The boundary of the gasification space formed during the combustion of coal is the key point. The determination of the boundary of the gasification chamber is not only related to the size of the gasification chamber, but the control of the boundary will also affect the gasification space. Cavity effectiveness and safety. [0003] Scholars such as Mellors and Jerald conducted a theoretical analysis on the expansion of the underground coal gasification gasification cavity, and used the method of combining field measurement and theoretical analysis to study the shape of the gasification cavity; Nourozieh, Prabu and other scholars studied the The expansion of gasification chamber shape...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/288G01V1/306G01V2210/624
Inventor 刘博王熙明李彦鹏徐刚容娇君储仿东刘聪伟王飞魏路路
Owner OPTICAL SCI & TECH (CHENGDU) LTD