Quantitative analysis of radiation energy in borehole sonic-electric transformation wave fields

Realization of sonically induced polarization (SIP) logging is based on stu dies of the borehole SIP effect. This effect is essentially transformation of acoustic waves into electromagnetic waves in two-phase porous media, res ulting in formation of borehole sonic-electric transformation wave-fields, and eventually behaves as transformation of acoustic radiation energy into electromagnetic energy. In this paper, through theoretical analysis of the energy components of the sonic-electric transformation wave-fields in two-p hase porous media, the overall energy composition of borehole sonic-electri c transformation wave-fields is studied. A concept of electrical energy vol umetric density of borehole low-frequency SIP electrical field is proposed, and its expression is derived. Finally by modeling borehole low-frequency SIP electrical fields with real formation parameter models, we have establi shed the relationships between both acoustic frequencies and formation para meters, and electrical energy volumetric density in the borehole low-freque ncy SIP processes.