Natural Gas Reservoir Characteristics and Non-Darcy Flow in Low-Permeability Sandstone Reservoir of Sulige Gas Field, Ordos Basin

Xiaoying Lin, Jianhui Zeng, Jian Wang and Meixin Huang
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Xiaoying Lin: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Jianhui Zeng: State Key Laboratory for Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
Jian Wang: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Meixin Huang: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China

Energies, 2020, vol. 13, issue 7, 1-17

Abstract: In order to reveal the gas–water distribution and formation mechanism of the low-permeability sandstone gas reservoir, the gas reservoir distribution and the formation mechanism in a low-permeability sandstone gas reservoir are investigated using data obtained from a physical simulation experiment of gas percolation. The exploration and experimenting for petroleum in the upper Paleozoic gas pool of the Sulige gas field in the Ordos basin in this paper. Results showed that the gas reservoir is characterized by low gas saturation, a complex distribution relationship of gas–water, and weak gas–water gravity differentiation. The characteristics of gas distribution are closely related to permeability, gas flow, and migration force. The capillary pressure difference is the main driving force of gas accumulation. There exists a threshold pressure gradient as gas flows in low-permeability sandstone. The lower that permeability, the greater the threshold pressure gradient. When the driving force cannot overcome the threshold pressure (minimal resistance), the main means of gas migration is diffusion; when the driving force is between minimal and maximal resistance, gas migrates with non-Darcy flow; when the driving force is greater than maximal resistance, gas migrates with Darcy flow. The complex gas migration way leads to complicated gas- water distribution relationship. With the same driving force, gas saturation increases with the improvement of permeability, thus when permeability is greater than 0.15 × 10 −3 µ m 2 , gas saturation could be greater than 50%.

Keywords: low-permeability sandstone reservoir; Sulige gas field; non-Darcy flow; gas reservoir distribution; irreducible water saturation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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