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Distributed optical fiber acoustic seismic wave
exploration technology
WANG Chang, SHANG Ying, WANG Chen , WANG Ying-ying, LIU Xiao-hui
Shandong Science
2021, 34 (4):
1-8.
DOI: 10.3976/j.issn.1002-4026.2021.04.001
As conventional and easy-to-extract oil and gas
resources are declining, the exploration and exploitation of oil and gas
resources in complex geological areas will play an increasingly important role
in reducing our country′s dependence on foreign oil and gas and ensuring
national energy security. Oil and gas reservoirs in complex geological areas
have the characteristics of thinner, deeper, and stronger heterogeneity.
Effective exploration is difficult to achieve using the existing seismic wave
detection technology. In this paper, a distributed optical fiber acoustic wave
sensing system for oil and gas seismic wave exploration and exploitation is
designed. An optical cable is used as the sensor to detect the sound signal.
Phase modulation/demodulation technology based on Rayleigh backscattering is
adopted in a sound pressure sensitivity test that achieved a spatial resolution
of 10 m and -145.35 dB. Further, field seismic exploration was conducted,
seismic wave signal acquisition and processing were completed, and clear
stratum information was obtained.
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