Abstract

Since gas hydrate dissociation is a coupled THMC (Thermo-hydro-mechanical-mechanicalchemical) process, understanding the in-situ relationships between geomechanical and fluid flow properties is crucial for addressing key production-related issues. This study conducts a comprehensive, well-log-based analysis using data from NGHP Expedition-02 to evaluate the reservoir's rock mechanical properties, including Young’s modulus, Poisson’s ratio, and compressibility. The study assesses the hydratebearing sand layers and the ability of the overlying units to act as seals, as well as their suitability for free gas production via depressurization. A comprehensive workflow for geomechanical and petrophysical parameters estimation has been presented, and valuable insights drawn from log-based analysis. Preliminary crossplots revealed consistent interrelationships with previous findings, between gas hydrate saturation, effective permeability, and select geomechanical parameters being used as the third axis. These early findings contribute to the understanding of gas production potential from gas hydrate deposits, with important implications for wellbore stability, sand production, effective stress accommodation by unconsolidated sediments due to reduction of pore pressure, and potential seafloor subsidence.