摘要
体积法测量的岩石压缩系数普遍偏高,是由于岩心与封套之间的微间隙所致。弹性模量法克服了微间隙的负面影响,测量的结果比较合理。岩石的压缩是因为骨架的压缩所致。岩石孔隙压力降低,骨架应力增加,因而骨架被压缩,并带动孔隙一起被压缩。骨架不会因为孔隙压力的降低而膨胀。当孔隙度为0时,孔隙体积的压缩系数当然为0.
The rock compressibility measured by volumetric method is usually overvalued,which is caused by the interstices between cores and core sleeves during experiments.The elastic modulus method gets rid of the negative effect of interstices on rock compressibility,with which the measurements are much more reasonable.The compression of rock results from the compression of rock matrix.The decrease of rock pore pressure results in the increase of rock matrix stress,which allows the matrix to be compressed along with the pore volume.Rock matrix can not expand with the decrease of pore pressure.As rock porosity equals to 0,the pore volume disappears,the compressibility of rock pore volume equals to 0 consequently.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2012年第1期125-126,共2页
Xinjiang Petroleum Geology
关键词
岩石
骨架
孔隙体积
压缩系数
油藏
rock
matrix
pore volume
compressibility
reservoir
