井中声电转换波场辐射能量定量分析

井中声激发极化效应研究是实现声激发极化测井实用化的技术基础,实质上是声波在双相孔隙介质中向电磁波的转化,其结果就是形成井中声电转换波场,最终表现为井中声场辐射能向电磁场能的转化.通过对双相孔隙介质中声激发极化过程声电转换波场能量的理论分析,研究了井中声电转换波场能量的总体构成,提出了井中低频声激发极化电场电能体密度的概念,并推导出具体表达式.通过采用实际地层参数模型进行井中低频声激发极化电场的模拟计算得到了井中低频声激发极化过程中电能体密度与声波频率与地层参数的相关关系.

QUANTITATIVE ANALYSIS OF RADIATION ENERGY IN BOREHOLE SONIC - ELECTRIC TRANSFORMATION WAVE FIELDS

Realization of sonically induced polarization (SIP) logging is based on studies of the borehole SIP effect. This effect is essentially transformation of acoustic waves into electromagnetic waves in two phase porous media, resulting 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 phase porous media, the overall energy composition of borehole sonic electric transformation wave fields is studied. A concept of electrical energy volumetric 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 established the relationships between both acoustic frequencies and formation parameters, and electrical energy volumetric density in the borehole low frequency SIP processes.