ISO 24835-2:2025

Natural gas upstream area — Determination and calculation of shale brittleness index — Part 2: Determination of shale mechanical characteristics based on triaxial testing method ISO 24835-2:2025

Publication date:   Nov 13, 2025

Scope

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.