塔里木盆地克深前陆冲断带储层岩石力学参数研究

Research on reservoir rock mechanical parameters of Keshen foreland thrust belt in Tarim Basin

综合采用岩石单轴压缩试验、三轴压缩试验及测井资料计算,对塔里木盆地克深前陆冲断带单井的岩石力学参数进行分析,通过单轴-三轴校正及动态-静态校正,确定静态岩石力学参数的单井剖面,利用高斯插值对岩石力学参数空间分布特征进行研究,并分析岩石力学参数与地层深度的关系。结果表明:岩石力学参数的空间分布主要与岩相有关,并在一定程度上反映了储层物性特征,弹性模量、内聚力和抗压强度大而泊松比小的区域储层物性相对更好;随着地层深度的增加,弹性模量、内聚力和抗压强度逐渐增加而泊松比逐渐下降;利用岩石力学参数与地层深度的关系以及断层带岩石力学参数的经验比例,可以对不同地质单元的岩石力学参数进行取值,为后续的地应力场及储层裂缝数值模拟奠定基础。

Rock mechanical parameters of single wells in the Keshen foreland thrust belt of Tarim Basin were analyzed by unixial compression,triaxial compression tests and logging data calculations,and single well profiles of static rock mechanical parameters were confirmed by uniaxial-triaxial and dynamic-static corrections. Analyses on the spatial contribution of rock mechanical parameters using Gaussian interpolation were carried out,and the relationship between rock mechanical parameters and strata depth was analyzed. The results show that rock mechanical parameters are mainly related to lithofacies,and are correlated to some extent with the reservoir physical property： for instance,areas with high modulus of elasticity,cohesion,compressive strength and low Poisson’s ratio have better reservoir physical property. With increasing strata depth,modulus of elasticity,cohesion and compressive strength increase,while Poisson’s ratio decreases gradually. Rock mechanical parameters in different geological elements can be estimated effectively using the relationship derived in this study combining with the experiential percentage of rock mechanical parameters in fault belts,which can facilitate subsequent numerical simulations of crustal stress field and reservoir fracture.