摘要
分析塔中工区奥陶系地层多口井的压裂施工资料,发现其压裂施工时记录的压力-时间曲线包含的地层应力信息能够真实地反映实际地层的地层应力大小,将该地层应力信息提取和分析后,较为准确地计算地层最小水平主应力;将该计算结果用于标定摩尔-库仑准则的地层应力测井计算结果,可确定摩尔-库仑准则的地层应力测井计算模型中内摩擦角参数,求得了塔中奥陶系地层岩石平均内摩擦角为21.25°。将该模型程序化后挂接在For-ward.NET平台上,成功处理了塔中工区多口井的测井资料,证明其地层应力计算结果可信,值得推广应用。
Through analyzing frecuring data of many wells in the Ordovician formation in central Tarim basin, it is found that formation stress information in pressure--time curves obtained from the fracturing data may reflect the true formation stress. With this stress we can accurately calculate the main minimum horizontal stress. The calculated stress ia put into Mohr-Coulomb logging calculation model and repeated calculations are made, from which we get the key parameter--- average internal friction angle（ψ） of the Ordovician formation rocks. The ψ value is about 21.25°. The above calculation model is programmed and used in Forward. NET platform to process logging data of many wells in the basin. Practical logging applications prove the processed is reliable, so the above method is worth using widely.
出处
《测井技术》
CAS
CSCD
2008年第6期553-555,共3页
Well Logging Technology
关键词
测井评价
地层应力
摩尔-库仑准则
水力压裂
内摩擦角
log evaluation, formation stress, Mohr-Coulomb criterion, hydraulic fracturing, internal friction angle
