STUDY OF ANISOTROPY EVALUATION USING CROSS-DIPOLE ACOUSTIC LWD

摘要：

　　The evaluation of anisotropy is one of the key and difficult points in the study of acoustic logging while drilling(AWLD).In this paper, the finite different method(FDM) is used to simulate the acoustic field excited by the cross-dipole sources in the anisotropic formation.And the flexural waves excited by dipole sources are used to invert the formation anisotropy in the ALWD.The results show that the cross-dipole sources in the HTI formation will stimulate the fast and the slow flexural waves whose velocities are less than these of the fast and the slow shear wave respectively.While using these two flexural waves, we managed to evaluate the anisotropy with a least squares fitting method based on analytic method.Moreover, the transverse direction of the transverse shear wave is obtained by the orthogonal component inversed by the Alford four component method.

关键词： Cross-dipole sources Acoustic logging while drilling Least squares fitting method Alford four component method

作者: Jian-qing WEI Xi-qiang LI Xiao HE Hao CHEN Xiu-Ming WANG

作者单位: Engineering and Technology Research Center for Deep Drilling Exploration and Measurement at Beijing, CNPC Greatwall Drilling Company, Beijing, China, 100124 Engineering and Technology Research Center for Deep Drilling Exploration and Measurement at Beijing,

会议类型: 国际会议

会议名称: The 2017 Symposium on Piezoelectricity,Acoustic Waves and Device Applications(2017全国压电和声波理论及器件技术研讨会)

会议地点: 成都

会议语种:英文

页码: 424-428

在线出版日期: 2017-10-27（万方平台首次上网日期，不代表论文的发表时间）