Journal
JOURNAL OF GEOPHYSICS AND ENGINEERING
Volume 15, Issue 2, Pages 330-337Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1742-2140/aa93af
Keywords
downhole microseismicity; shearlet transform; SNR enhancement; strip matching
Categories
Funding
- National Natural Science Foundation of China [41574096]
- Jilin provincial special fund for industrial innovation from China [2017C031-1]
- Special Project of Jilin University-Province Collaboration Funding [SXGJQY2017-9]
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Shearlet transform has been proved effective in noise attenuation. However, because of the low magnitude and high frequency of downhole microseismic signals, the coefficient values of valid signals and noise are similar in the shearlet domain. As a result, it is hard to suppress the noise. In this paper, we present a novel signal-to-noise ratio enhancement scheme called strip matching shearlet transform. The method takes into account the directivity of microseismic events and shearlets. Through strip matching, the matching degree in direction between them has been promoted. Then the coefficient values of valid signals are much larger than those of the noise. Consequently, we can separate them well with the help of thresholding. The experimental results on both synthetic records and field data illustrate that our proposed method preserves the useful components and attenuates the noise well.
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