APPLICATIONS OF PERTURBATION THEORY TO CIRCUMFERENTIALLY INHOMOGENEOUS FORMATION

摘要：

　　Based on an interest in the properties of circumferentially inhomogeneous media, a model was proposed which was divided into 4 equal blocks circumferentially, with 2 different homogeneous isotropic media spaced apart in order, and with a fluid-filled borehole in the center.Perturbation method theory was applied into acoustic logging, relating the first-order perturbation in wave number and shear modulus, and then the variation of the dispersion of the flexural waves was discussed when perturbation exists on the shear wave velocity.Rotating the source to different directions, the dispersion waves were contrasted with the pure formations dispersion to observe the properties of the circumferentially inhomogeneous model.The dispersion waves of different directions showed distinct difference.The phase velocity increase gradually during the source rotated from the center of slow blocks to the center of fast blocks.This is similar to the anisotropic formations conditions.

关键词： Perturbation method Circumferential inhomogeneity Acoustic logging Anisotropy

作者: Yun-hong SONG Hao CHEN Xiu-ming WANG

作者单位: University of Chinese Academy of Sciences, Beijing, 100049 State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100 Beijing Engineering Research Center of sea deep drilling and exploration, Beijing, 100190

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: 384-387

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）