低渗透储层不存在强应力敏感

LOW PERMEABILITY ROCKS ARE LESS SENSITIVE TO STRESS

李传亮

Li Chuanliang

西南石油学院油气藏地质及开发工程国家重点实验室, 四川成都 610500

State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation, Southwest Petroleum Institute, Chengdu 610500, Sichuan

储层岩石对应力的敏感程度与岩石的致密程度有关,低渗透储层比中高渗透储层更致密,因而对应力变化应该更不敏感。但是,实测应力敏感曲线出现了反常现象:低渗透储层比中高渗透储层对应力更敏感。这是由于实验的系统误差所致,而非岩石本身的性质。实验时岩心与封套之间存在的微间隙,导致了低渗透储层比中高渗透储层对应力更加敏感的现象。

The stress sensitivity of reservoir rocks is related to their tightness. Because rocks of low permeability are tighter than those of high permeability, they should be less stress-sensitive than those of high permeability. However the stress-sensitivity curve measured in laboratory showed the reversal, i.e. the rocks of low permeability are more stress-sensitive than those of high permeability. Research of this paper found that the curves of lab oratory were affected by the systematical error of measurements. The property of rock itself is concealed in the measurement. The micro-interstices between core and sleeve play a role in core measurements.

10.3969/j.issn.1000-7393.2005.04.019