摘要
从麦克斯韦方程组出发推导出三轴磁偶极子源在频率-波数域中的解析表达式,结合归一化广义反射系数,求解井眼内磁场多分量。通过矢量叠加得到任意方向发射-接收天线磁场,模拟随钻方位电磁波测井仪器测量信号受井眼电导率、偏心、地层电导率等因素的影响规律。结果表明:共面发射-接收天线测量到的磁场强度比非共面发射-接收天线的强度小;钻井液电导率对磁场信号影响不明显,地层电导率大于0.1 S/m时磁场信号非线性关系明显增强;偏心方向对仪器磁场信号影响明显;在偏心状态下仪器磁场信号与自转方位角关系复杂。
The analytical expression of triaxial magnetic dipole source in frequency-wavenumber domain was derived based on Maxwell’s equations.Combined with the normalized generalized reflection coefficient,the electromagnetic field in multi-layered uniaxial anisotropic formation is solved.Then the magnetic field component with transmitting-receiving antenna in any direction is obtained by vector superposition.The effects on the measured magnetic field by e.g.,borehole conductivity,eccentricity,formation conductivity and other parameters are simulated and analyzed.The results show that the magnetic field intensity from the coplanar transmit-receive antenna is smaller than that of the non-coplanar transmit-receive antenna.The conductivity of borehole has little effects on the magnetic field.The nonlinear relationship between the magnetic field and the formation conductivity is significantly enhanced when the latter is larger than 0.1 S/m.Eccentric azimuth has an obvious effect on the measured magnetic field,and the relationship between the magnetic field and the rotation azimuth is complex when the instrument rotates around itself in an eccentric state.
作者
李国玉
洪德成
岳喜洲
刘天淋
武圣哲
马明学
LI Guoyu;HONG Decheng;YUE Xizhou;LIU Tianlin;WU Shengzhe;MA Mingxue(Well-Tech R&D Institute,China Oilfield Services Limited,Beijing 101149,China;Internal Center for Computational Method and Software,College of Physics,Jilin University,Changchun 130012,China;School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第5期46-58,共13页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家自然科学基金项目(41874132)
国家重点研发计划项目(2017YFC0307104)
中国海洋石油集团科技项目(CNOOC-KJGG-2022-1402)。
关键词
圆柱状分层
磁偶极子源
方位电磁波
超深探测
cylindrical layered formation
magnetic dipole
directional logging
ultra-deep detection
