仪器偏心对纵横波衰减影响的正演实验

近年来,水平井得到了越来越广泛的应用,在页岩气等非常规油气藏以及海上油气藏的勘探开发中发挥了至关重要的作用。但水平井测井在影响因素校正、资料处理和解释等方面尚存在诸多问题。针对仪器偏心对水平井声波测井响应影响的问题,开展了相关的物理模拟实验研究和数值模拟分析。提取了不同偏心率条件下的模式波的能量参数,分析了模式波能量随仪器偏心率的变化关系。结果表明,当仪器处于偏心状态时,模式波的能量均与仪器偏心率呈现类似负指数关系;仪器偏心率与模式波的能量衰减系数呈现“S”曲线变化关系。本研究成果有助于厘清仪器偏心对水平井声波测井响应的影响规律并为进一步开展仪器偏心对阵列声波测井响应影响校正方案研究提供指导。

Experimental Study of the Forward Modeling Effects of Tool Eccentricity on Longitudinal and Transverse Wave Attenuation

In recent years, horizontal wells have witnessed an increasingly extensive application, playing a pivotal role in the exploration and development of unconventional oil and gas reservoirs, such as shale gas, and offshore oil and gas reservoirs. Nevertheless, horizontal well logging still presents a plethora of challenges pertaining to factors affecting corrections, data processing, and interpretation. To explore the impact of tool eccentricity on acoustic logging in horizontal wells, relevant physical simulation experiments and numerical analyses were conducted. Energy parameters of mode waves were extracted under varying eccentricity conditions, and an in-depth analysis of the relationship between mode wave energy and tool eccentricity was carried out. The findings reveal that, when the tool is in an eccentric state, the energy of mode waves exhibits a relationship akin to a negative exponential function with tool eccentricity. Furthermore, we have observed an "S"-shaped curve relationship between tool eccentricity and the energy attenuation coefficient of mode waves. These research results serve to elucidate the influence pattern of tool eccentricity on the acoustic logging response of horizontal wells and provide valuable guidance for further investigations into correction strategies regarding the impact of tool eccentricity on array acoustic logging responses.