The Ratio of the Acoustoelectric Field to the Acoustic Pressure in the Borehole and Its Dependence on Permeability

详细信息   

• 责任者：Guan Wei (Department of Astronautics and Mechanics ; Harbin Institute of Technology ; Harbin 150001 ; China) ; Hu Hengshan
• 刊名：Chinese Journal of Geophysics
• 出版年：2011
• 卷期：54(6)
• 关键词：地震勘探 ; seismic exploration ; 地球物理测井 ; geophysical logging
• 页码：p.1660-1671
• 图表：5 illus., 2 tables, 34 refs.
• 分类号：1600
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

Acoustoelectric logging based on the coupling between elastic wave and electromagnetic field in fluid-saturated porous media has potential value in the detection of formation characteristics. Applying Pride’s equations for the coupled poroelastic and electromagnetic fields, the authors derive the expression of the ratio of the borehole acoustoelectric field accompanying the Stoneley wave to the acoustic pressure (REP) in the frequency domain. It is shown that the tangent of the REP’s argument is inversely proportional to permeability. On this basis, the authors propose a method to invert formation permeability from the full waveforms of the low-frequency acoustoelectric logging.