摘要
利用震电效应测井已经成为地球物理测井领域的前沿课题,研究井中浓差极化对震电效应的影响具有重要意义。建立了考虑浓差极化效应的震电耦合波控制方程组,数值模拟了浓差极化、阳离子交换量和孔隙度对震电耦合波的影响规律。随着浓度差的增大或阳离子交换量的减小,3种震电波的电场强度与固相速度之比的模值减小。随着孔隙度的增大,震电横波和震电快纵波的电场强度与固相速度之比的模值增大,而震电慢纵波减小。浓差极化方向对震电波电场也有影响。浓差极化与固相运动方向垂直时的电场模值小于平行的状况,且二者的模值都大于等效平均浓度的状况。
The seismoelectric logging has become a leading subject in the field of geophysical logging, and studying the impact of concentration polarization on seismoelectric logging is significant.iBased on original theory of Pride, the seismoelectric coupled equations which considers concentration polarization is established, then influence of the concentration polarization, the cation exchange capacity and porosity on the propagation of seismoelectric wave are analyzed by mathematical simulation. The results show that for three kinds of seismoelectric waves, the amplitude of electric field decreases with increasing concentration difference or decreasing cation exchange capacity. When the porosity increases, the amplitude of electric field enhances for the transverse wave and fast longitudinal wave, while the slow longitudinal wave is contrary. The direction of concentration difference always affects the electric field. The electric field in which directions of solid-phase vibration and concentration difference are mutually perpendicular is less than that in which directions are mutually parallel.
出处
《测井技术》
CAS
CSCD
北大核心
2014年第5期535-540,共6页
Well Logging Technology
基金
国家自然科学基金(41174101)
关键词
测井方法
电法测井
震电效应
浓差极化
数值模拟
电场强度
影响机制
logging method, electrical logging, seismoelectric effect, concentration polarization, mathematical simulation, electric field, influence mechanism
