| 李萌,肖梦想,陶爱华,王华,石少鹏,汪强.套管井超声弯曲波测井逆时偏移数值实验研究*[J].,2024,43(6):1302-1312 |
| 套管井超声弯曲波测井逆时偏移数值实验研究* |
| Numerical Study on Cased-hole Reverse Time Migration for Ultrasonic Pitch-Catch Measurements |
| 投稿时间：2023-08-11 修订日期：2024-10-28 |
| 中文摘要: |
| 在套管井复杂测量环境中,水泥-地层界面的反射波幅度弱且易受多次波与散射波的干扰,使得基于走时信息的处理方法难以有效确定地层界面的位置与产状。本文将综合运用动力学和运动学特征的叠前逆时偏移技术引入套管井固井质量评价领域,基于数值模拟研究了水泥类型、套管尺寸、水泥胶结质量和II界面产状对套管井超声弯曲波逆时偏移成像结果的影响规律。研究结果表明,套管井逆时偏移方法适用于各种尺寸的套管,其成像质量与水泥和地层的波阻抗之差成正相关,具备识别I界面和II界面水泥缺失的潜力。此外,由于目前缺乏对水泥和地层介质的有效速度分析方法,需要综合多种偏移速度模型的逆时偏移成像结果来确定II界面的构造产状与几何位置。 |
| 英文摘要: |
| The reflections from cement-formation interface has weak amplitude and is easy to be distorted by multiples and scatters in complex cased-hole ultrasonic pitch-catch measurements. It makes the arrival based methods difficulty to effectively image the cement-formation interface. In this study, the effects of cement type, casing size, cement bond quality and shape of cement-formation interface are investigated based on numerical studies. The results revealed that the cased-hole RTM is feasible in various casing size measurements and its imaging quality is mainly depended on the impedance between cement and formation. The proposed method is illustrated to hold the potential to reveal the cement absence both at casing-cement interface and cement-formation interface. Finally, it requires to employ various migration velocity models to determine the position and structural geology of the cement-formation interface since effective velocity analysis approaches are scare. |
| DOI：1000-310X(2024)06-1302-11 DOI: |
| 中文关键词: 声波测井 套管井 逆时偏移 固井质量评价 |
| 英文关键词: Acoustic logging Cased well Reverse time migration Cement bond evaluation |
| 基金项目:国家自然科学基金（41974150和42174158）、陕西省自然科学基金项目(2023-JC-YB-220) |
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