- 责任者：Wei Zhoutuo (COSL-UPC Allied Borehole Acoustic Laboratory ; School of Geosciences and Technology ; China University of Petroleum ; Qingdao 266580 ; China) ; Tang Xiaoming
- 刊名：Acta Petrolei Sinica
- 出版年：2013
- 卷期：34(5)
- 关键词：声波测井 ; acoustical logging
- 页码：p.905-913
- 图表：9 illus., 1 table, 16 refs.
- 分类号：1600
- issnNo：ISSN0253-2697
- isbnNo：CN11-2128/TE
Single-well shear-wave imaging by a borehole dipole source, a dipole far-detecting technique, emerged in recent years as an important geophysical well-logging method and it has obvious advantages compared with previous monopole reflected P-wave meth- od. A 313 finite-difference method has been used to simulate the elastic wave-field radiation and reflection generated by a borehole di- pole source in an acoustically slow formation, analyze directionality of the P-wave far-field radiation by either dipole or monopole source in a fluid-filled borehole, and examine variation characteristics of the dipole P wave reflection field and validate its feasibility in conjunction with numerical simulation of the P-wave far-detecting acoustic imaging technique. The result shows that the dipole-gen- erated P-wave is of stronger amplitude and higher reflection sensitivity relative to the monopole one and it can be utilized to determine the dimensional azimuth and orientation of a reflector in an acoustically slow formation. The comparison of applications of both the dipole and monopole P-wave far-detecting techniques indicates that the former is of important supplement and completion for P wave remote acoustic imaging. In addition, we discussed possible reasons why its applications are better in a slow formation than in a fast formation and proposed some solutions to 180° uncertainty of the reflector azimuth in imaging processing.