利用频谱分析方法评价快速地层固井质量  

Cementing Quality Evaluation in Tarim Oilfield Through Frequency Spectrum Analyses

作　　者：范文同[1] 王天雨 艾勇[1] 郭喜纯 袁仕俊[1] 李科 

机构地区：[1]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [2]中国石油集团长城钻探工程有限公司测井公司,辽宁盘锦124011

出　　处：《测井技术》2013年第3期317-321,共5页Well Logging Technology

摘　　要：套管井的快速地层中地层波和套管波经常叠加在一起,时域上难以区分,很难利用声幅/变密度测井准确评价其固井质量。以塔里木油田2口井的碳酸盐岩地层剖面井段的固井质量分析为例,从理论上分析套管波和地层波的频率特征,套管波的频率高于地层波频率,利用频谱分析方法可以有效识别快速地层和砂泥岩地层中的套管波与地层波。利用地层波和套管波的频域不同的特性,通过检测相应频域的幅度或功率值计算第Ⅰ、Ⅱ界面的胶结指数。There are many carbonate formations in Tarim Oilfield. In cased holes, formation waves and casing waves often overlap, which makes it difficult to discriminate between them in time domain and hard to use wave amplitude/VDL to make a correct cement quality evaluation in fast formations. Taken cementing evaluation data of the carbonate intervals in 2 wells as an example, this article theoretically analyzes the frequency characteristics of casing waves and formation waves. Actual field data processing shows that the frequency of casing waves is higher than that of formation waves. So, with the frequency spectrum analyses, it is possible to separate casing waves from formation waves in frequency domain in the fast formation and sand shale formation. Because the frequency domain in the above two waves is different, we may use amplitude in the corresponding domain to calculate the bonding index of interfaceⅠ and Ⅱ.

关 键 词：测井评价 固井质量 快速地层 胶结指数 地层波 套管波 频谱分析 

分 类 号：P631.811[天文地球—地质矿产勘探]