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TitleWettability of the Montney tight gas formation
AuthorLan, Q; Dehghanpour, H; Wood, J M; Sanei, H
SourceSpe Reservoir Engineering vol. 118, issue 03, 2015, 21 pages,
Alt SeriesEarth Sciences Sector, Contribution Series 20140432
PublisherSociety of Petroleum Engineers
MeetingSPE/CSUR Unconventional Resources Conference; Calgary; CA; September 30 - October 2, 2014
Mediapaper; on-line; digital
File formatpdf
AreaWestern Canadian Sedimentary Basin
Subjectshydrocarbons; hydrocarbon potential; permeability; resource estimation; reserve estimation; pore structure; organic materials; Montney tight gas formation; tight formation; imbibition experiments; adsorption
ProgramShale Reservoir Characterization, Geoscience for New Energy Supply (GNES)
AbstractThe abundant hydrocarbon resources in low-permeability formations are now technically accessible due to advances in
drilling and completion of multi-lateral/multi-fractured horizontal wells. However, measurement and modeling of
petrophysical properties, required for reserve estimation and reservoir-engineering calculations are the remaining challenges
for the development of tight formations. In particular, characterizing wettability (wetting affinity) of tight rocks is
challenging due to their complex pore structure, which can be either in hydrophobic organic materials or in hydrophilic
inorganic materials.
We conduct comparative and systematic imbibition experiments on ten twin core plugs from the Montney tight gas
formation, which is an enormous tight gas fairway in the Western Canadian Sedimentary Basin. Both contact angle and
imbibition data indicate that the formation has a stronger affinity to oil than to water. However, the ratio between oil and
water uptake of these samples is usually higher than what capillary-driven imbibition models predict. This discrepancy can be
explained by the strong adsorption of oil on the surface of a well-connected organic pore-network that is partly composed of
degraded bitumen. We also define a wettability index based on the equilibrium oil and water uptake of the twin samples. Oil
wettability index is positively correlated with Total Organic Carbon (TOC) and clay content of the rocks, which generally
increase from the Upper Montney to the Lower Montney.
Summary(Plain Language Summary, not published)
This paper describes the mechanism of flowing hydrocarbon in the Montney reservoir pore network and is important for understanding of reservoir quality and production of hydrocarbon.