This study, conducted by Professor Zhenyuan Yin's laboratory at Tsinghua Shenzhen International Graduate School, investigates the path-dependent morphology of CH4 hydrates and their dissociation using a high-pressure microfluidic system. The research aims to understand the dynamic multiphase flow behavior at the pore scale, which is crucial for applications in underground CO2 sequestration and H2 storage. The study reveals two primary mechanisms of hydrate formation: (1) porous-type hydrates formed from CH4 gas bubbles at the gas-liquid interface, and (2) crystal-type hydrates formed from dissolved CH4 gas. The growth and movement of crystal-type hydrates can trigger the sudden nucleation of porous-type hydrates. During dissociation under thermal stimulation, gas bubbles evolve through three distinct stages: single bubble growth, rapid cluster formation, and coalescence. The novel microfluidic chip and image analysis technique provide direct visual evidence of hydrate formation and dissociation, offering valuable insights into gas-liquid two-phase flow behavior in natural gas hydrate reservoirs.This study, conducted by Professor Zhenyuan Yin's laboratory at Tsinghua Shenzhen International Graduate School, investigates the path-dependent morphology of CH4 hydrates and their dissociation using a high-pressure microfluidic system. The research aims to understand the dynamic multiphase flow behavior at the pore scale, which is crucial for applications in underground CO2 sequestration and H2 storage. The study reveals two primary mechanisms of hydrate formation: (1) porous-type hydrates formed from CH4 gas bubbles at the gas-liquid interface, and (2) crystal-type hydrates formed from dissolved CH4 gas. The growth and movement of crystal-type hydrates can trigger the sudden nucleation of porous-type hydrates. During dissociation under thermal stimulation, gas bubbles evolve through three distinct stages: single bubble growth, rapid cluster formation, and coalescence. The novel microfluidic chip and image analysis technique provide direct visual evidence of hydrate formation and dissociation, offering valuable insights into gas-liquid two-phase flow behavior in natural gas hydrate reservoirs.