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利用地震资料估算地层速度的精度分析
石油物探
2009年 48卷 第No. 6期
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Title
Accuracy analysis on formation velocity estimation by seismic data
单位
1.中国石油天然气股份有限公司大港油田分公司油气藏评价事业部，天津300280；2.中国石油大学（北京）中国石油天然气集团公司物探重点实验室，北京102249
Organization
Department of Reservoir Assessment,Dagang Oilfield Branch Company,Tianjin 300280,China
摘要
为了了解利用地震数据进行地层速度估算的适用性和可靠性，依据大港油田的测井数据和地质特征设计了一个典型地质模型。通过对正演模拟叠前地震波场的速度分析，讨论了地震速度分析误差对地层速度的影响，在此基础上，对实际地震速度与测井速度进行了分析对比。发现在将地震速度转换为层速度过程中，地震速度分析的误差被放大，这种放大效应会严重降低利用地震速度进行岩性检测的精度和可靠性。
Abstract
In order to understand the applicability and reliability of formation velocity estimation by seismic data,a typical geologic model was designed according to logging data and geologic characteristics of Dagang Oilfield.The influence of seismic velocity analysis error on formation velocity was discussed by velocity analysis on the forward simulated prestack seismic wavefield.On the basis,the seismic velocity and logging velocity were analyzed and compared.It is found that,during conversing seismic velocity into layer velocity,the error of seismic velocity analysis is amplified,this kind of amplification seriously decreases the accuracy and reliability of lithologic detection by seismic velocity.
关键词：
地震速度;
地层速度;
测井速度;
波场模拟;
速度分析;
误差分析;
Keywords:
seismic velocity;
formation velocity;
logging velocity;
wavefield simulation;
velocity analysis;
error analysis;
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