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Mathematical Problems in Engineering
Volume 2015, Article ID 969702, 7 pages
http://dx.doi.org/10.1155/2015/969702
Research Article

Application of a New Wavelet Threshold Method in Unconventional Oil and Gas Reservoir Seismic Data Denoising

1Chengdu University of Technology, Chengdu 610059, China
2Nation Institute of Measurement and Testing Technology, Chengdu 610021, China
3CNPC Chuanqing Drilling Engineering Company Limited, Chengdu 610000, China

Received 5 January 2015; Accepted 27 February 2015

Academic Editor: Yun-Bo Zhao

Copyright © 2015 Guxi Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Seismic data processing is an important aspect to improve the signal to noise ratio. The main work of this paper is to combine the characteristics of seismic data, using wavelet transform method, to eliminate and control such random noise, aiming to improve the signal to noise ratio and the technical methods used in large data systems, so that there can be better promotion and application. In recent years, prestack data denoising of all-digital three-dimensional seismic data is the key to data processing. Contrapose the characteristics of all-digital three-dimensional seismic data, and, on the basis of previous studies, a new threshold function is proposed. Comparing between conventional hard threshold and soft threshold, this function not only is easy to compute, but also has excellent mathematical properties and a clear physical meaning. The simulation results proved that this method can well remove the random noise. Using this threshold function in actual seismic processing of unconventional lithologic gas reservoir with low porosity, low permeability, low abundance, and strong heterogeneity, the results show that the denoising method can availably improve seismic processing effects and enhance the signal to noise ratio (SNR).