摘要
传统声波时差检测方法是基于正常压实趋势线的 ,仅适用于欠压实泥岩地层。提出利用声波速度等测井资料检测地层孔隙压力的“综合解释方法” ,即同时考虑砂泥岩地层的泥质含量、孔隙度、垂直有效应力对声波速度的影响 ,先由相关测井资料求取泥质含量和孔隙度 ,再由声波速度计算垂直有效应力 ,最后通过有效应力计算地层孔隙压力。初步应用效果表明 ,该方法能够利用声波速度检测砂泥岩及非欠压实成因的异常高压 ,而且检测精度很高。图 1参
The traditional pore pressure estimation methods based on sonic logs use a shale disequilibrium compaction model and a normal compaction trend for their calculations. In this paper, a new method called Integrated Evaluation Model is proposed, which uses sonic and other related well log data to evaluate pore pressure, that is, with giving consideration to the effect of clay content, porosity, vertical effective stress of shale sand formation on sonic velocity. Firstly the clay content and porosity are calculated from related well logging data; then vertical effective stress is calculated from sonic velocity and finally the pore pressure is calculated from obtained effective stress. Practical application shows that excellent results can be obtained with this model for the shale sand formation.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2002年第1期90-92,共3页
Petroleum Exploration and Development
