Title :
A new method of extracting shear slowness from borehole mode waves
Author :
Wang, Rui-Jia ; Qiao, Wen-Xiao ; Che, Xiao-Hua
Author_Institution :
State Key Lab. of Pet. Resources & Prospecting, China Univ. of Pet., Beijing, China
Abstract :
Asymmetrical sources were introduced into modern well logging tools for measuring shear slowness of soft formation. However, the mode waves exciting in borehole are all dispersive waves. It is impossible to right extract the shear slowness using traditional slowness time coherence (STC) method. A new shear slowness extracting method is proposed based on phase spectrum coherence in this paper. The method in verified by both the synthesized flexural waves and field data. The results show that the proposed method is stable and reliable.
Keywords :
seismic waves; seismology; surface acoustic waves; well logging; asymmetrical source; borehole mode wave; dispersive wave; shear slowness extraction; slowness time coherence method; soft formation; well logging tool; Acoustics; Coherence; Correlation; Dispersion; Equations; Mathematical model; Phase change materials; acoustic well logging; borehole mode; dispersive waves; phase slowness; shear wave;
Conference_Titel :
Image and Signal Processing (CISP), 2010 3rd International Congress on
Conference_Location :
Yantai
Print_ISBN :
978-1-4244-6513-2
DOI :
10.1109/CISP.2010.5647298
