具有埋深校正的岩石静态脆性指数计算方法——以吉木萨尔凹陷二叠系芦草沟组为例

A Rock Static Brittleness Index Calculation Method Considering Burial Depth Correction:A Case Study of Permian Lucaogou Formation in Jimsar Sag

以动、静态岩石力学实验及其他配套实验数据为依据,优选出杨氏模量与泊松比的比值表征静态脆性指数,建立了基于孔隙度和黏土矿物含量的动、静态脆性指数转换模型,实现了静态脆性指数的测井计算。最后,研究了埋深对脆性指数的影响,建立了脆性指数的埋深校正模型,形成了相对完善的、具有埋深校正的岩石静态脆性指数的测井计算方法。该方法对研究区岩石脆性计算结果与岩心静态脆性实验结果相吻合,已在生产中广泛应用。

Based on the data of dynamic and static rock mechanics experiments and other supporting experiments,the ratio of Young’s mod?ulus to Poisson’s ratio is preferred as the method to characterize the static brittleness index,a dynamic-static brittleness index conversion model based on porosity and clay content is established and the static brittleness index can be calculated.Finally,the influence of burial depth on brittleness indexes is studied,burial depth correction is performed,and then a relatively sophisticated rock static brittleness calcu?lation method considering burial depth correction is established on the basis of logging data.The calculation results of the rock brittleness are consistent with the results of core static brittleness experiment in the study area,and the method has been widely used in production.