@Article{icces.2023.09159,
AUTHOR = {Mianmo Meng, Wenming Ji},
TITLE = {Water Occurrence and	Its	Influencing	Factors	in	Tight	Gas	Reservoirs},
JOURNAL = {The International Conference on Computational \& Experimental Engineering and Sciences},
VOLUME = {26},
YEAR = {2023},
NUMBER = {4},
PAGES = {1--1},
URL = {http://www.techscience.com/icces/v26n4/54071},
ISSN = {1933-2815},
ABSTRACT = {Tight	reservoirs	hold	a	vast	natural	gas	in	Ordos	Basin,	and	efficient	development	of	these	resources	can	
offset	 the	 energy	 shortage.	Due	 to	the	low-porosity	 and	low-permeability,	 hydraulic	 fracturing	 becomes
necessary	 to	 tap	 its	 resources.	 After	 fracturing,	 a	 large	 amount	 of	 fracturing	 fluid	 fills pore	 space	 near	
hydraulic	fracture,	which	will	influence	the	gas	production.	This	study	focused	on	the	water	occurrence	of	
tight	gas	reservoirs	and	its	influencing	factors. Samples	were	selected	from	Upper	Paleozoic	Taiyuan	and	
Shihezi	 Formations from	 Ordos	 Basin. The	 main	 experiments include porosity,	 permeability,	 mineral	
composition,	nitrogen	adsorption	(NA),	mercury	intrusion	porosimetry	(MIP),	nuclear	magnetic	resonance	
(NMR),	 high-speed	 centrifugation, and so	 on. The	 water	 occurrence	 was	 divided	 into	 movable water	
saturation	 (S<sub>mov</sub>) and	 irreducible	 water saturation (S<sub>irr</sub>).	 Further,	 the	 irreducible	 water saturation was	
divided	into	water saturation controlled	by	capillary	force (S<sub>irrc</sub>) and	water saturation in	big	pores	controlled	
by	small	throat (S<sub>irrl</sub>). In	both	Formations,	the	irreducible	water	saturation has	a	negative	relationship	with
porosity,	permeability,	and	average	pore	diameter,	and	a	positive	relationship	with	specific	surface	area.
The	Sirrl has	a	positive	relationship	with	the	median	pore-throat	diameter	in	Taiyuan	Formation,	but	the	Sirrl
has	a	weak	relationship	with	the	median	pore-throat	diameter	in	Shihezi	Formation.	The	Sirrc has	a	negative	
relationship	 with	 porosity,	 permeability,	 and	 average	 pore	 diameter,	 and	 a	 positive	 relationship	 with	
specific	surface	area	in	Taiyuan	Formation,	but	the	S<sub>irrc</sub> has	a	weak	relationship	with	these	parameters	in	
Shihezi	Formation.},
DOI = {10.32604/icces.2023.09159}
}