岩石中裂纹孔隙率的实验测定  

Experimental measurement of crack porosity in rocks

作　　者：刘新美[1] 杨玉荣[2] 耿乃光[1] 刘晓红[1] 郝晋升[1] 

机构地区：[1]中国地震局地球物理研究所,中国北京100081 [2]中国地震局,中国北京100036

出　　处：《中国地震》2001年第3期317-321,共5页Earthquake Research in China

基　　金：中国地震局地球物理研究所论著编号01AG2025

摘　　要：岩石中的孔隙按形状划分 ,可以大致分成孔洞和裂纹两类。孔洞的纵横比大 ,形状近似于球形 ,它与油气储藏有密切关系。孔洞孔隙度是岩石孔隙度的主要贡献。裂纹纵横比小 ,形状细长 ,它所造成的孔隙度是岩石总孔隙度的一小部分。但是岩石中裂纹的存在和裂纹孔隙度的变化 ,对于岩石的各向异性和S波的分裂有重要的影响。本文利用两类不同形状孔隙对流体静压力的不同响应 ,利用改变流体静压力的实验对岩石中的裂纹孔隙率进行了测定 ;实验得到的裂纹孔隙率和岩石裂纹的闭合压力 ,为了解岩石各向异性、S波分裂以及地壳动力学提供了基础数据。Generally, according to their shapes, void of rocks are d ivided into two kinds: pore and crack. The pore’s aspect ratio is large; its shape is spherical ap proxi mately. It has close relation with oil-gas accumulation in rocks. The pore poro s ity is the main factor to the rock porosity. The aspect ratio of crack is small; its shape is long and thin. Its porosity composed a small part of the whole roc k porosity. But the existence and variation of crack porosity in rocks has impor tant influence on anisotropy and S wave splitting of rocks. Using the different responses between the two shapes of void to hydrostatic pressure and the change of the hydrostatic pressure experiment, the crack porosity in roc ks is determined. The crack porosity and closed pressure obtained by the experim ent provided the basic data for understanding anisotropy of rocks, S wave splitt ing and crust dynamics.

关 键 词：裂纹孔隙率 各向异性 孔隙度 孔洞 岩石力学 闭合压力 

分 类 号：TU45[建筑科学—岩土工程]