BS ISO 24835-2:2025

This document specifies the principles, instruments, materials and experimental conditions for testing Young’s modulus and Poisson’s ratio using triaxial testing method. It also specifies the sampling and mechanical testing procedures, as well as the method and precision requirements for calculating shale mechanical brittleness index based on Young’s modulus and Poisson’s ratio.

This document is applicable to reservoir quality evaluation and sweet spot identification in shale gas production.