Lower threshold of pore-throat diameter for the shale gas reservoir: Experimental and molecular simulation study

Qin Zhang, Feng Liang, Zhenglian Pang, Shu Jiang, Shangwen Zhou, Jinchuan Zhang

Research output: Contribution to journalArticle

Abstract

Low-field nuclear magnetic resonance (LF-NMR), high-speed centrifuge and low-pressure nitrogen adsorption (LPNA) experiments were conducted on shale samples from the Lower Silurian Longmaxi Formation to measure pore-throat parameters of the shale reservoir. We measured bound water saturation, helium porosity, bulk density, specific surface area, and pore-size distribution to evaluate reservoir quality. The thickness of the bound water film was calculated based on the equation established from these parameters, showing that its thickness ranges from 1.07 nm to 2.73 nm, with a mean of 1.72 nm. In addition, Grand Canonical Monte Carlo (GCMC) and molecular dynamics (MD) simulations were carried out to estimate the methane adsorption capacity and the number of the adsorbed layers in pores with different sizes at the given temperature and pressure (393.15 K, 65 MPa). The simulation results demonstrate that methane is unanimously adsorbed into pores <1.52 nm in diameter. Shale gas was present in both free and adsorbed states when the pore size was larger than 1.52 nm, and two layers were adsorbed on each pore wall. By combining the thicknesses of bound water film and adsorbed layers, the pore-throat lower limit for the shale gas reservoir was calculated to be about 4.96 nm.

LanguageEnglish (US)
Pages1037-1046
Number of pages10
JournalJournal of Petroleum Science and Engineering
Volume173
DOIs
StatePublished - Feb 1 2019

Fingerprint

Shale
Pore size
shale
Methane
methane
simulation
adsorption
Adsorption
Water
Centrifuges
centrifuge
Specific surface area
Density (specific gravity)
water
Silurian
helium
bulk density
Helium
nuclear magnetic resonance
Molecular dynamics

Keywords

  • Adsorbed layer
  • Bound water film
  • Grand canonical Monte Carlo
  • Molecular dynamics simulation
  • Pore-throat threshold
  • Shale reservoir

ASJC Scopus subject areas

  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology

Cite this

Lower threshold of pore-throat diameter for the shale gas reservoir : Experimental and molecular simulation study. / Zhang, Qin; Liang, Feng; Pang, Zhenglian; Jiang, Shu; Zhou, Shangwen; Zhang, Jinchuan.

In: Journal of Petroleum Science and Engineering, Vol. 173, 01.02.2019, p. 1037-1046.

Research output: Contribution to journalArticle

Zhang, Qin ; Liang, Feng ; Pang, Zhenglian ; Jiang, Shu ; Zhou, Shangwen ; Zhang, Jinchuan. / Lower threshold of pore-throat diameter for the shale gas reservoir : Experimental and molecular simulation study. In: Journal of Petroleum Science and Engineering. 2019 ; Vol. 173. pp. 1037-1046.
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