用滑移界面理论模拟多裂缝体系的偶极横波远探测声场

偶极横波远探测已成为探测储层裂缝的重要测井技术,裂缝及其充填物质的弹性性质决定了其对远探测声场的响应特征.本文运用滑移界面理论来描述井外地层中裂缝对声场的响应特征,考察了SH横波的反射和透射系数随充填物的变化规律.建立了井外双裂缝远探测声场的几何模型,以双裂缝为例给出了偶极横波远探测声场的快速模拟方法,并将所得结论应用于现场远探测裂缝的识别和解释.本文的研究结果为偶极横波远探测数据的处理和解释提供了理论依据.

Simulation of dipole shear-wave reflection survey for multi-fracture system using liner slip interface theory

Single-well shear-wave imaging has recently emerged as an important well-logging technology for reservoir fracture detection and evaluation.The elastic properties of the fractures and their filling material influence the characteristics of the wavefield for the borehole reflection survey.This paper analyses the elastic wave response of the fractures using the linear slip interface theory and investigates the effects of fracture material variation on the SH-wave characteristics.We establish a geometric model for the double fracture system to simulate the wavefield for the borehole reflection survey.A fast and effective method was formulated for the simulation.The results were applied to characterize and interpret the fracture system from the field dipole shear wave reflection survey data.The results of this study provide a useful theoretical foundation for the field data interpretation.