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提出了一种新的井内相控圆弧阵相位控制方式,实现了对地层SH横波的定向发射和接收,在此基础上发展了一种利用反射SH横波对井外反射体进行远探测的测井方法,旨在突破目前发展的偶极子SH横波远探测方法在地质体方位确定方面的局限性.数值模拟结果表明,合理的相位控制方式可以使得圆弧阵接收(发射)器能够对SH横波进行定向接收(发射),且在目标接收(辐射)方位,不存在SV波场及纵波场的干扰;改变声源和接收器的相位控制方式,可以通过SH波场对井外波阻抗不连续界面的进行扫描,其反射波清晰,方位分辨率高.与传统的单极子纵波远探测方法相比,一方面该方法具有较好的方位分辨能力,能够准确确定反射体在三维空间中的位置,另一方面SH反射波在洞穴、裂缝成像方面更具有优势.与传统的偶极SH横波远探测方法相比,由于该方法引入了具有SH横波定向接收功能的圆弧阵接收器,能够消除反射体方位测量的多解性.
A new phase control method of phased arc array in well was proposed to realize the directional transmission and reception of SH shear wave in the stratum. Based on this, a method was developed to measure the outer well reflector with SH shear wave Well method is designed to overcome the limitations of the current dipole SH shear-wave detection method in determining the azimuth of geological bodies.Numerical simulation results show that the reasonable phase control method can make the arc array receiver (transmitter) capable of SH The shear wave is directed to receive (launch), and there is no interference of SV wave field and longitudinal wave field in the target receiving (radiation) direction. Changing the phase control mode of the sound source and receiver can make the wave impedance outside the well Continuous interface scanning, the reflected wave clear, high azimuth resolution.Compared with the traditional monopole longitudinal wave far detection method, on the one hand the method has better azimuth resolution, can accurately determine the reflector in three-dimensional space On the other hand, the SH reflected wave has more advantages in caves and fracture imaging.Compared with the traditional dipole SH shear-wave far detection method, Annular array of receivers, multiple solutions can be eliminated the orientation of the reflector measured.