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研究了相控圆弧阵声源在各向异性地层井孔中产生的声场的特征,重点分析了该声源对于地层横波各向异性的方位敏感性,旨在探索一种新的地层声学各向异性测量方法。结果显示:相控圆弧阵声源在地层中可激发多种方位阶数的声场,主要成分为单极子波场和偶极子波场;在HTI地层竖直井中,方位角不同的圆弧阵声源激发的波动的速度不同,相控圆弧阵声源对于地层横波速度的方位各向异性的敏感性主要是它所激发的弯曲波的贡献。相比于传统的正交偶极子声波测井而言,采用相控圆弧阵声源可以评价井附近地层的周向非均质性,可以提高井周测量覆盖次数,提高反演结果的可靠性。另外,相控圆弧阵声源兼具备多极子声源的功能,优化的相位控制方式可以实现方位各向异性的最佳测量。
The characteristics of sound field generated by phased arc array sound source in wellbore of anisotropic formation are studied. The azimuthal sensitivity of this sound source to shear wave anisotropy is analyzed emphatically. The purpose is to explore a new acoustic The opposite sex measurement method. The results show that the phased arc array sound source can excite a variety of azimuthal acoustic fields in the strata, the main components of which are the monopole wave field and the dipole wave field. In the vertical wells of the HTI formation, azimuth circles The velocity of wave excitation by the arc array sound source is different. The sensitivity of the phased arc array sound source to the azimuthal anisotropy of the stratigraphic shear wave velocity is mainly the contribution of the bending wave it excites. Compared with the traditional orthogonal dipole acoustic logging, the use of phased circular arc array sound source can evaluate the circumferential heterogeneity of the formation near the well, improve the coverage of well measurements and improve the reliability of the inversion results . In addition, phased arc array sound source combines the functions of multi-polar sound source. The optimized phase control method can achieve the best azimuthal anisotropy measurement.