Back to Abstract Index
Paper Number: 73
1Jiang,
T., 2Xu, X., 3Song, J, 4Zou, Y. and
5Zheng, C.
1
Key Laboratory of geo-exploration instrumentation of Ministry of
Education, Jilin University, Changchun 130026, jiang_t@jlu.edu.cn
2
College of Earth Sciences, Jilin University, Changchun 130026
___________________________________________________________________________
Seismic signals from controlled source seismic exploration are often
weak in strong noise background. Beam-forming is useful to solve
problems as above. Time domain seismic beam-forming based on receiver
array (TSBBRA) method is helpful to improve signal-to-noise ratio (SNR)
in seismic exploration with controlled source. If the background-noise
is very strong, SNR can be improved in main beam direction by increasing
quantity of seismic source used in TSBBRA processing. However, the
seismic beam will become narrower. When the main beam does not cover the
receiver array, the average SNR of seismic records will decline and
couldn’t meet the requirements of seismic data processing. In order to
get higher SNR in each shot record, we propose “Seismic Beam-forming
with Cosine Amplitude Distribution” (SBCAD) to extend seismic beam
width, so that SNR could be increase in most channels. SBCAD generates
directional seismic records by introducing cosine amplitude distribution
in beam-forming processing. We simulate the seismic data of TSBBRA and
SBCAD, and the results show that while beam from TSBBRA can’t cover the
receiver array, SBCAD works well. SNR increases 2.49dB averagely in
synthetic seismic record. Seismic reflected target at 350ms can be
identified clearly after SDBCAD method although it is invisible in raw
seismic data. It concludes that SBCAD is competent in beam shape
control, SNR and resolution enhancement and deeper seismic signal
detection.
References:
[1]Arnold M E (1977) Geophysics 42(7): 1321-1338
[2]Lesnik
C et al. (2009) Computational Methods and Experimental Measurements
XIV 48: 229-239
[3]Jiang T et al. (2006) Chinese Journal of Geophysics 49(6):
1819-1825
