摘要
在碳酸盐岩Kaiser效应实验研究的基础上,分析了不同加载应力和岩芯放置时间对碳酸盐岩Kaiser效应点的影响规律,得出预加载应力为单轴强度的(25%～70%)、放置时间为4个月左右时岩石的Kaiser效应记忆性最好;讨论了Felicity效应比值的分布特征,获得了应力、时间耦合下碳酸盐岩地应力的计算公式,形成了碳酸盐岩地层地应力确定方法。该法应用于西部某油田地应力测量,解释出的地应力结果精度满足工程应用的要求,解决了时间、应力敏感性带来的碳酸盐岩地应力测量精度低的难题,完善了地应力的测量体系,为碳酸盐岩地层高效开发提供了基础数据。
Based on the experimental study on the Kaiser effect for carbonate formation,the effect of different loading stresses and the time of core storage on Kaiser effect points for carbonate formation are analyzed.It is concluded that when the pre-loaded stress is 25%-70 % of the uniaxial strength and the time of core storage is 4 months,the Kaiser effect memory is the best.The distribution characteristics of the ratio of Felicity effect are discussed,the in-stress formula for carbonate formation which couples time and stress is obtained,and the method for stress determination in carbonate formation is generated.This method is applied to the stress measurement in an oil field in western China.The precision of the explained stress meets the requirements of engineering application.The problem of low precision of in-stress measurement for carbonate formation caused by time and stress sensitivity is solved.The proposed method improves stress measurement system and provides basic data for the efficient exploitation of carbonate formation.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2011年第8期1192-1196,共5页
Chinese Journal of Geotechnical Engineering
基金
973项目(2010CBN2267002008)
教育部新世纪优秀人才支持计划(NCET-08-0840)
