Evolution of hydrate habit and formation properties evolution during hydrate phase transition in fractured-porous medium

Hang Bian, Xuwen Qin, Wanjing Luo, Chao Ma, Jian Zhu, Lu Cheng, Yingfang Zhou* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
2 Downloads (Pure)


Natural gas hydrate, as an efficient and clean energy resource, are naturally distributed in porous and fractured-porous medium. With the most recent development of advanced micro-scale imaging techniques, hydrate habits evolution, hydrate occurrences, and pore structure evolution as well as seepage characteristics during hydrate phase transition in porous hydrate-bearing sediments have been studied extensively at pore scale. However, there are few studies on gas hydrates in fractured-porous sediment. In this work, xenon hydrate phase transition experiment by excess-gas method is carried out in a fractured sandstone core with in-situ micro computed tomography (micro-CT) scanning to explore the evolution of hydrate habits and physical parameters of the host sediment. The results indicate that hydrate-bearing sediment is a dynamic equilibrium system as hydrate synthesis and decomposition occur simultaneously at each moment of hydrate phase transition induced by pressure change. The hydrate occurrences in fractured hydrate reservoirs include contiguous-sheet, clustered and isolated, which are slightly different from that of porous hydrate formation; and the contiguous-sheet hydrate is the occurrence that dominantly determines the seepage characteristics of fractured hydrate-bearing sediments. In addition, the logic diagram for hydrate growth paths in fractured-porous medium is presented for the first time. These findings are significant for detailed understanding of pore-scale hydrate distribution throughout phase transition process and provide theoretical basis for precise modeling of permeability in host sediments.

Original languageEnglish
Article number124436
Number of pages14
Issue numberPart A
Early online date13 May 2022
Publication statusPublished - 15 Sept 2022

Bibliographical note

The authors are grateful to the National Natural Science Foundation of China (51991365); China Geological Survey Project(No. DD20211350); Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (GML2019ZD0105); Key Program of Marine Economy Development (Six Marine Industries) Special Foundation of Department of Natural Resources of Guangdong Province [2020]047; Guangdong Major Project of Basic and Applied Basic Research (No.2020B0301030003).


  • Hydrate Habit
  • Hydrate Morphology
  • Fractured-Porous Medium
  • Micro-CT
  • Seepage Capacity
  • SAND


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