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Influencing factors analysis and remote acoustic sensing instrument preferences optimization on reflected shear-wave of fluid-filled borehole dipole excitation
WEI Zhou-tuo1,2, TANG Xiao-ming1,2, CHEN Xue-lian1,2
(1.School of Geosciences in China University of Petroleum, Qingdao 266580, China;2.COSL-UPC Allied Borehole Acoustic Laboratory in China University of Petroleum, Qingdao 266580, China)
Abstract:
According to practical needs of acoustic remote detection logging, the present paper investigates the influences of source frequency, reflection interface position, interface dip and dipole source orientation on S-wave reflection amplitude by using an accurate 3D finite difference numerical simulation method. Analysis results show that the operating frequency of the dipole S-wave remote detection instrument should be below the cut-off frequency of flexural wave, so as to enhance the amplitude of the reflected signal from formation reflector relative to that of the direct flexural wave along borehole. It is recommended that the data acquisition tool should have a source-to-receivers offset less than 4m in order to effectively image a formation reflector with a dip angle in 40°-90° range.
Key words:  acoustic logging  reflected S-wave amplitude  dipole source frequency  receiver offset