Geophysical research: article

I. Fadeeva1,2
A. Duchkov1,2
A. Manakov1,3
D. Aunov2
1 Novosibirsk State University
2 Trofimuk Institute of Petroleum Geology and Geophysics SB RAS
3 Nikolaev Institute of Inorganic Chemistry SB RAS
Journal: Geophysical research
Tome: 21
Number: 2
Year: 2020
Pages: 61-77
UDK: 550.367
DOI: 10.21455/gr2020.2-5
Full text
Keywords: quantitative assessment of hydrate content, laboratory experiment, carbon dioxide hydrate, thermal conductivity, thermal diffusivity, volumetric heat capacity
Аnnotation: A new approach to the assessment of hydrate content in the sediments by the geothermal method is proposed. The transition of pore water to gas hydrate significantly reduces the heat capacity of the sediment. The amount of hydrate contained in the pores can determine by measuring the volumetric heat capacity of sediments in two different states: with and without hydrate in the pores (after its complete decomposition, only water remains in the pores). The volumetric heat capacity can calculate as the ratio of thermal conductivity to thermal diffusivity. The thermal conductivity and diffusivity of the sediment in different states can be determined using a two-needle probe according to the method proposed in this work. The proposed approach in laboratory experiments was tested. The volumetric heat capacity of the sample in its various states is measured. The sample is the sand with synthetic carbon dioxide hydrate formed in a thermostatic high-pressure chamber (the volume of the obtained hydrate-containing sample is about 1000 cm