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Proceedings Paper

Field test investigation of high sensitivity fiber optic seismic geophone
Author(s): Meng Wang; Li Min; Xiaolei Zhang; Faxiang Zhang; Zhihui Sun; Shujuan Li; Chang Wang; Zhong Zhao; Guanghu Hao
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Paper Abstract

Seismic reflection, whose measured signal is the artificial seismic waves ,is the most effective method and widely used in the geophysical prospecting. And this method can be used for exploration of oil, gas and coal. When a seismic wave travelling through the Earth encounters an interface between two materials with different acoustic impedances, some of the wave energy will reflect off the interface and some will refract through the interface. At its most basic, the seismic reflection technique consists of generating seismic waves and measuring the time taken for the waves to travel from the source, reflect off an interface and be detected by an array of geophones at the surface. Compared to traditional geophones such as electric, magnetic, mechanical and gas geophone, optical fiber geophones have many advantages. Optical fiber geophones can achieve sensing and signal transmission simultaneously. With the development of fiber grating sensor technology, fiber bragg grating (FBG) is being applied in seismic exploration and draws more and more attention to its advantage of anti-electromagnetic interference, high sensitivity and insensitivity to meteorological conditions.

In this paper, we designed a high sensitivity geophone and tested its sensitivity, based on the theory of FBG sensing. The frequency response range is from 10 Hz to 100 Hz and the acceleration of the fiber optic seismic geophone is over 1000pm/g. sixteen-element fiber optic seismic geophone array system is presented and the field test is performed in Shengli oilfield of China. The field test shows that: (1) the fiber optic seismic geophone has a higher sensitivity than the traditional geophone between 1-100 Hz;(2) The low frequency reflection wave continuity of fiber Bragg grating geophone is better.

Paper Details

Date Published: 24 October 2017
PDF: 6 pages
Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 104641G (24 October 2017); doi: 10.1117/12.2285275
Show Author Affiliations
Meng Wang, Laser Institute of Shandong Academy of Sciences (China)
Li Min, Laser Institute of Shandong Academy of Sciences (China)
Xiaolei Zhang, Laser Institute of Shandong Academy of Sciences (China)
Faxiang Zhang, Laser Institute of Shandong Academy of Sciences (China)
Zhihui Sun, Laser Institute of Shandong Academy of Sciences (China)
Shujuan Li, Laser Institute of Shandong Academy of Sciences (China)
Chang Wang, Laser Institute of Shandong Academy of Sciences (China)
Zhong Zhao, Sinopec Geophysical Co. (China)
Guanghu Hao, Shengli Oilfield Xinsheng Geophysical Technology Co. Ltd. (China)


Published in SPIE Proceedings Vol. 10464:
AOPC 2017: Fiber Optic Sensing and Optical Communications
Zi-Sen Zhao; Leping Wei; Yanbiao Liao; Weixu Zhang; Desheng Jiang; Wei Wang; Kenneth T. V. Grattan, Editor(s)

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