渤南洼陷低孔隙度低渗透率地层岩石力学参数测井计算方法

摘要

In view of low porosity and low permeability formation in Bonan subsag,a research about logging evaluation method of rock strength is developed.The research is based on petrophysics and rock mechanics theory,it tests parameters such as rock strength,acoustic travel time and density,etc.Mechanical parameter modeling is achieved after analysis of mathematical statistics and is used in computation about pressure of formation collapsing,breakdown pressure and other parameters of borehole stability.In contrast to actual data of drilling engineering,it indicates that the computation model of rock mechanical parameter is well adaptable to the formation in the studied area,and supplies reliable criterion for engineering designation,and plays a vital function in enhancing wellbore quality,protecting hydrocarbon reservoir effectively and reducing drilling cost.%针对胜利油田渤南洼陷低孔隙度低渗透率地层开展了岩石强度测井评价方法研究.以岩石物理学、岩石力学为理论基础,在实验室同步测试岩石强度及声波时差、密度等测井参数.经数理统计分析后建立力学参数计算模型,并将其应用到地层坍塌压力、破裂压力等井壁稳定性评价参数的计算中.与实际钻井工程资料对比表明,所构建的岩石力学参数计算模型对研究工区地层具有较好的适应性,能够给工程设计提供可靠的依据,对提高井身质量、有效保护油气层、降低钻探成本有着重要意义.