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孔隙压力对岩石弹性应变的影响,是进行储层压实、地面沉降问题等油藏工程及环境研究的基础。Biot系数是确定孔隙压力对岩石变形影响的一个重要参数。本文发表了对灰岩样品的Biot系数的测量以及测量值的解释。首先孔隙弹性研究中所用的系数定义为Biot系数,或Zimmerman提出的压缩系数。然后描述测量这些系数的实验仪器和方法。最后发表实验结果并对其进行讨论,这些结果证实了孔隙弹性的理论机制。按照形式上与Hashin—Shtrickman规律类似的规律,压缩系数和Biot系数随孔隙度增加而增加。对4.5％到23％的孔隙范围,Biot系数从0.34增大到0.83。
The influence of pore pressure on the rock elastic strain is the basis for reservoirs and environmental studies such as reservoir compaction and land subsidence. The Biot coefficient is an important parameter for determining the effect of pore pressure on rock deformation. This paper presents the Biot Coefficients for the limestone samples as well as the interpretation of the measured values. First, the coefficients used in pore elasticity studies are defined as the Biot coefficient, or the compressibility factor proposed by Zimmerman. The experimental instruments and methods for measuring these coefficients are then described. Finally, the experimental results are published and discussed. These results confirm the theoretical mechanism of pore elasticity. According to a rule similar to Hashin-Shtrickman’s rule, the compressibility coefficient and Biot coefficient increase with the increase of porosity. For a porosity range of 4.5% to 23%, the Biot coefficient increased from 0.34 to 0.83.