基于邻井反射的偶极横波远探测验证方法

偶极横波远探测技术已成为探测井外地质构造的一种重要测井技术,需要针对偶极横波远探测的验证迫在眉睫。本文利用三维有限差分数值模拟方法,对比和分析了地层界面和相邻充液邻井产生的反射横波幅值的差别,结合现场实例,提出了偶极横波远探测成像测井的验证方法。在此基础之上,进一步分析了不同反射邻井结构时,反射横波幅度的变化情况,结果表明,采用多井联合方式可以有效的增加反射波的幅值,减小非共面产生的散射效应影响。最后,初步建立了两口试验井,测试数据处理结果与理论分析结果吻合,为下一步实验井方案的优选和完善提供了理论和数据支持。

VALIDATION METHOD OF DIPOLE ACOUSTIC REFLECTION IMAGING FROM THE ADJACENT BOREHOLE REFLECTION

Dipole acoustic reflection imaging technology has become an effective logging technology to be used in detecting near-borehole geologic structure, so validation of dipole acoustic reflection imaging is imminent. This paper uses 3D finite difference numerical simulation method to compare and analyze difference of reflected shear wave amplitude from the near-borehole formation interface and the adjacent fluid-filled borehole. And then, proposes a validation method of dipole acoustic reflection imaging combining field case. On this basis, the paper further analyzes the change of reflected shear-wave amplitude for different adjacent borehole structure. The results show that the multi-well combination way can effectively improve amplitude of reflected shear-wave, reduce the scattering effect caused by non-coplanar. Finally, Experimental wells have been established, and the field data processing results accord with that of theoretical analysis, which provides the theoretical and data support for selection and improvement of experimental well next.