中文摘要：

油气储层岩石的三阶弹性常数反映了该岩石的速度应力敏感性，是利用声波测井或地震资料进行原位地应力反演的基本参数。本文阐述了利用声弹性理论在实验室测量岩石三阶弹性常数的原理与方法，并给出了部分实验结果。这些参数将为研究声波在预应力声场中传播规律的提供基础数据，同时也为定量分析利用交叉偶极声波测井评价地应力的精度提供了依据。不同岩石的三阶弹性常数较大差异表明，通过速度各向异性进行应力反演时必须考虑岩石本身非线性的差异。

英文摘要：

Third order elastic constants of reservoir rock reflect its sensitivity of velocity to stress. They are the parameters to invert in situ stress from sonic log or seismic data. Based on acoustelastic theory, this paper gives the principle and method to measure these constants in laboratory. The paper provides third elastic constants of some rocks. These are the basic data to study acoustic or elastic wave propagation in prestressed rock and to evaluate the precision of inversion stress by cross-dipole sonic logging. Great difference of third elastic constants for different rocks shows that it is necessary to get a set of third elastic constants of the rock to determine the stress by velocity anisotropy.