supported by the National Natural ScienceFoundation of China(Grant Nos.10534040,40574049 and 40874097);the Research Fund for the Doctoral Programof Higher Education(Grant No.20070425028);the Foundation of State Key Laboratory of Petroleum Resourceand Prospecting,China University of Petroleum(Grant No.PRPDX2008-08).
The acoustic tools widely used in borehole well logging and being developed in borehole acoustic reflection imaging do not have the function of azimuthal measurement due to a symmetric source, so they can not be used ...