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

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作  者:李萌 肖梦想[1,2] 陶爱华 王华[4] 石少鹏 汪强 LI Meng;XIAO Mengxiang;TAO Aihua;WANG Hua;SHI Shaopeng;WANG Qiang(School of Geosciences and Engineering,Xi'an Shiyou University,Xi'an 710065,China;Shaanxi Key Lab of Petroleum Accumulation Geology,Xi'an 710065,China;China Oilfeld Services Limited,Tianjin 300451,China;School of Resources and Environment,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区:[1]西安石油大学地球科学与工程学院,西安710065 [2]西安石油大学陕西省油气成藏地质学重点实验室,西安710065 [3]中海油田服务股份有限公司,天津300451 [4]电子科技大学资源与环境学院,成都611731

出  处:《应用声学》2024年第6期1302-1312,共11页Journal of Applied Acoustics

基  金:国家自然科学基金项目(41974150,42174158);陕西省自然科学基金项目(2023-JC-YB-220)。

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。该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呈正相关,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。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 reverse time migration 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.

关 键 词:声波测井 套管井 逆时偏移 固井质量评价 

分 类 号:P631.814[天文地球—地质矿产勘探]

 

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