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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.
In order to study the effect of rock particle cementing on reservoir rock elasticity and seepage properties, a three-dimensional digital core was constructed by process simulation. On the basis of this, finite element method and lattice Boltzmann method were used to study the uniform growth of cement , Along the pore growth and along the throat growth of three kinds of cementing on rock elasticity and seepage characteristics of the law.The results show that: rock particle cementing will affect the rock rigidity and pore connectivity, causing the rock elastic modulus and permeability changes. Under the same porosity, the rock formed by the cementitious material growing along the throat has the strongest compressive resistance and the lowest permeability. The rock formed along the pore growth has the lowest compressive resistance and the highest permeability. Under the three cementing modes, the rock elasticity modulus As the content of cements increased, the rate of change was approximately equal. The permeability of rock decreased with the increase of cement content, and the permeability of rock was more sensitive to the change of particle cementation.