摘要
川东北地区碳酸盐岩地层埋藏深、速度差异小,完全套用基于"欠压实"理论的孔隙压力计算结果误差较大。因此,在总结碳酸盐岩地层压力成因的基础上,根据碳酸盐岩测井响应特征,修正了声波速度随有效应力的变化公式,根据横波速度更易受到孔隙压力影响的原理,拟合了纵横波速度比(Vp/Vs)与有效应力的关系公式,分别建立了川东北地区陆相地层和海相地层的孔隙压力预测计算模型,计算精度能满足现场工程需要。
The carbonate rocks of Northeast Sichuan Area were deeply buried,the speed difference was small,there existed big errors in the result calculated by fully using 'un-compaction' based theory.Therefore on the basis of summarizing the genesis of carbonate formation pressure and carbonate logging response characteristics,the equation of speed of sound changes with the effective stress was modified.According to the principle of wave velocity which was more easily influenced by pore pressure,the correlation formulae between the vertical and horizontal wave velocity ratios(Vp/Vs) and the effective stress were fitted,and models of pore pressure prediction of continental and marine strata in Northeastern Sichuan Area are established,the accuracy of calculation can satisfy the requirement of field operation.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2011年第8期96-98,103,共4页
Journal of Oil and Gas Technology
基金
国家"863"计划项目(2006AA06A109-1-2)
关键词
孔隙压力
声波速度
有效应力
川东北
碳酸盐岩
pore pressure
acoustic velocity
effective stress
Northeastern Sichuan Area
carbonate rock
