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Automatic Detection and Location of Microseismic Events

Author: LvShiChao
Tutor: SongWeiZuo
School: China University of Petroleum
Course: Earth Exploration and Information Technology
Keywords: Micro- earthquakes Polarization filtering Real-time monitoring Automatic Identification Hypocenter Fracture properties
CLC: P631.4
Type: Master's thesis
Year: 2011
Downloads: 386
Quote: 3
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Abstract


Micro-seismic monitoring to monitor the water fracturing, oil and gas extraction and other factors lead to underground rock stress field resulting in cracking or dislocation resulting micro-seismic signals, enabling the monitoring of cracks or reservoir. At present mainly used for micro-seismic monitoring of hydraulic fracturing, fracturing fluid leading edge imaging of fracturing effect is evaluated to guide the next production and development, and to provide the basis for the adjustment of reservoir engineering. Because of the need to evaluate the results using the fracturing and as a basis for the development of programs to make timely adjustments, the need for hydraulic fracturing micro seismic monitoring real-time data processing and interpretation. Therefore, this article studies on the micro-seismic monitoring valid event source for automatic identification and automatic positioning method. This paper describes the micro-seismic monitoring data preprocessing methods for micro-seismic data signal to noise ratio is low, conventional filtering methods can not play the desired effect, and to analyze the time domain, frequency domain different polarization filtering method, the introduction of multi-stage window function, the design of multi-window spectral polarization filtering method, in the case of low SNR achieved relatively good results. In the analysis of micro-seismic monitoring of fracturing valid signal and noise, based on the length of time windows designed with energy ratio method combined with polarization analysis based on micro-seismic events automatically identify effective methods based multistage detector signals between the effective Occurs constraint on the recognition results. Then the direct wave polarization characteristics, and micro hypocenter location prior, and on the micro-seismic phases direct wave preliminary judgment. The traditional method of micro-earthquake hypocenter beginning to require the use of information retrieval, to overcome early to pick up on the micro-seismic data processing flow spend a lot of time effects, this paper proposes the use of space scan superimposed on the micro-seismic source for fast positioning methods. Discusses the scanning overlay overlay guidelines while introducing the idea of ??tracking components, make full use of three-component energy information and make method has strong anti-noise capabilities. Through the model data and the calculation of the actual monitoring data to verify the positioning of this scanning method is reliable stacking. Ultimately based on micro-seismic fracture automatic identification and localization results, cracks rupture timing and relative energy source, combined with geological situation on the water front and hydraulic fracturing fracturing the fracture properties of the distribution of the interpretation of research. Through the model and the actual trial data processing, you can show that the design of automatic identification and fast positioning method can achieve more accurate real-time monitoring of micro-earthquakes.

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
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