Effects of Cementation on Elastic Property and Permeability of Reservoir Rocks
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摘要: 为研究岩石颗粒胶结方式对储层岩石弹性和渗流性质的影响，采用过程模拟法构建了三维数字岩心，在此基础上，分别利用有限元方法和格子玻尔兹曼方法研究了胶结物均匀生长、沿孔隙生长和沿喉道生长3种胶结方式对岩石弹性和渗流特性的影响规律.结果表明：岩石颗粒胶结方式会影响岩石刚性和孔隙连通性，引起岩石弹性模量和渗透率的变化.在相同孔隙度下，胶结物沿喉道生长形成的岩石抗压性最强，渗透率最小；沿孔隙生长形成的岩石抗压性最弱，渗透率最大.3种胶结方式下，岩石弹性模量随着胶结物含量增加而增大，变化率近似相等；岩石渗透率随着胶结物含量的增加而减小，岩石渗透性对颗粒胶结方式的变化更敏感.Abstract: In order to investigate the efects of cementation on elastic properties and permeability of reservoir rocks, a 3D digital model of core was constructed. Then this model was simulated using the process-based method and finite element lattice Boltzmann method. The results show that cementation influences the rock stiffness and pore connectivity, controlling elastic modulus and rock permeability, respectively. Given same porosity, rocks with cement occurring in the pore throats have high elastic modulus and low permeability; whereas rocks with cement precipitating within pores have low elastic modulus and high permeability. Among the simulated three cementation scenarios, the rock elastic modulus increases with increasing amount of cement, and there is a linear relationship between them, Rock permeability, however, deceases with increasing amount of cement, because permeability is more sensitive to where cements precipitate than rock elastic parameters.
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图 5 不同胶结方式所构建三维数字岩心的横截面
a.胶结方式Ⅰ；b.胶结方式Ⅱ；c.胶结方式Ⅲ
Fig. 5. Cross-section of digital rocks with different cementation modes
表 1 数字岩心模拟参数
Table 1. The parameter of digital rocks
模拟参数 数值 孔隙度 0.350 0.300 0.250 0.200 0.150 0.100 0.050 压实因子 0.015 0.015 0.015 0.015 0.015 0.015 0.015 成岩因子 0.000 0.038 0.079 0.126 0.182 0.252 0.360 
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