Application of pore fluid pressure prediction by velocity spectrum to Tahe oilfield Zhu Ding，Li Zongjie and Fu Tongtong

doi:10.11743/ogg20110118

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Application of pore fluid pressure prediction by velocity spectrum to Tahe oilfield Zhu Ding，Li Zongjie and Fu Tongtong
Vol. 32, Issue 1, Pages: 150-156(2011)
Online First：28 February 2011，

Published：2011
DOI： 10.11743/ogg20110118
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DOI：

Application of pore fluid pressure prediction by velocity spectrum to Tahe oilfield Zhu Ding，Li Zongjie and Fu Tongtong[J]. 2011, 32(1): 150-156. DOI： 10.11743/ogg20110118.

摘要

分析了地层压力异常形成的原因，介绍了测井曲线预测地层压力的等效深度法和Fillippone速度谱预测地层压力的原理。给出了两种预测结果与MDT测试压力的对比数据。测井声波时差曲线预测地层压力在塔河油田托浦台工区的应用表明，该区地层压力系数范围在1.0~1.2，属于正常压力系统；速度谱预测地层压力与MDT测试压力的最大误差为5%，而等效深度法预测误差最大达15%左右，速度谱法比等效深度法预测地层压力具有更高的精度和可靠性。研究认为，利用地震处理速度谱法进行钻前压力预测，可以预测大套地层压力的变化趋势，可以用来指导钻井泥浆密度的设计，为提高钻井效率和安全钻井提供技术支持。

Abstract

The reasons for anomalous pore pressure are analyzed in this paper. The methods of equivalent depth to predict pore pressure from well logging data and Fillippone’ formula based on seismic velocity are introduced and compared with the results from MDT pressure data. The results of prediction of pore pressure from well sonic data in the Tahe oilfield TPT area shows that this area pressure coefficient change from 1.0 to 1.2

can be classified as normal pressure system. The maximum error between MDT and predicted pore pressure by Fillippone’ formula reaches 5% as predictied pore pressure by equivalent depth method reaches 15%

so Fillippone’ formula has high precision and reliability than the equivalent depth method. This study show that prediction of pore pressure using seismic velocity can predict the layer pressure which embodies the pressure change trend of a heavy layer and design the mud density before drill. It can also can improve the drill productivity and approve the support for safe drill.