岩石渗透率与其应力的关系及应用

THE RELATION BETWEEN PERMEABILITY AND STRESS FOR ROCKS AND ITS APPLICATION

根据岩石成岩过程中岩石结构和受力变化，分析了岩石渗透率和应力的指数关系，并且认为它受岩性和岩石结构的影响，通过多种常用和新式应力模型及岩心样品渗透率的研究，证明了上述关系的存在。将渗透率和应力的关系用于油气储层和煤层气储层的实际应用中显示：油气储层测试用最能描述岩石力学性质受泥质影响的是自然伽玛测井曲线，以此消除和降低岩性的影响，从而改善水平应力计算的准确性；通过提取分辨率高的测井方法—微球型聚焦测井上的分辨率信息，显著地提高了由应力求出的渗透率的分辨率。总之，利用地球物理测井能将岩石渗透率－应力这一关系巧妙地用于石油、天然气和煤层气的勘探开发。

An exponential function of permeability and stress has been analysed on the basis of change of texture and stress in diagenetic process of rocks.The relationship has been affected by the lithology and the texture of the rocks. The relationship is substantiated by studying on many general and new stress models of deep rock and core sample permeability.Mechanic parameters have been computed by well logging information.Dynamic static transformation has been made for studying difference of dynamic and static parameters. For actual usage,the relationship between permeability and stress for oil gas reservoir has been studied.Accuracy of computed horizontal stress has been improved by Ray log which responds to shale well and it describes change of the mechanic parameters and decreases the effect of lithology.As resolution information from Micro Spherical Focused log of high resolution has been abstracted,the resolution of permeability from the stress has increased obviously. Briefly,the relationship between permeability and stress for rocks revealed by geophysical log can be used for prospecting and development of oil,gas,coal gas.