摘要
岩石的各向异性可以分为应力各向异性和材料各向异性两种,通常用声波速度在各个不同传播方向上的差异来表示岩体的各向异性。正确地认识岩石的应力各向异性形成机理对于计算各项岩石参数、分离应力各向异性和材料各向异性都有重要的意义。通过声波试验指出,岩石的应力各向异性是由于岩石内的孔隙形变引起的,并发现岩石的应力各向异性系数会随着应力增加而出现波动且波动幅度越来越小。
Rock anisotropy could be divided into stress anisotropy and material anisotropy. The difference of aciustic velocity in different directions wes used to the anisotropy of rocks. Correct recognition of the forming mechanism of rock anisotropy was of great significance for calculating rock parameters, separated stress anisotropy and material anisotropy. It is pointed in acoustic test that rock stress anisotropy is caused by porosity deformation, it is also found that the anisotropy is surged with stress increase and surging amplitude is less and less.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2008年第6期295-298,共4页
Journal of Oil and Gas Technology
关键词
岩石
各向异性
形成机理
声波速度
试验研究
rock
anisotropy
forming mechanism
acoustic velocity
experimental study
