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TitleA dual-porosity model for evaluating petroleum resource potential in unconventional tight-shale plays with application to Utica Shale, Quebec (Canada)
AuthorChen, Z; Lavoie, D; Malo, M; Jiang, C; Sanei, H; Haeri-Ardakani, O
SourceMarine and Petroleum Geology vol. 80, 2017 p. 333-348,
Alt SeriesEarth Sciences Sector, Contribution Series 20140328
PublisherAssociation of American Petroleum Geologists
Mediapaper; on-line; digital
File formatpdf
Subjectspore structure; hydrocarbon potential; modelling; reservoirs; lithology; Utica Shale; matrix pore; organic pore; kerogen kinetics; pore systems; Ordovician
Illustrationsgraphs; flow charts; geological sketch maps; stratigraphic charts; histograms
ProgramShale-hosted petroleum ressource assesment, Geoscience for New Energy Supply (GNES)
AbstractUnconventional tight to shale reservoirs vary from tight sandstone/siltstone to organic-rich mudstone/shale, commonly with mixed lithologies. In such reservoir systems, matrix pores and organic pores with different origins and distinct physical and chemical properties co-exist for hydrocarbon storage. Traditional resource assessment methods, designed for conventional reservoirs, cannot handle the two pore systems properly. This study proposes a dual-porosity model to respond to the need for a new method in assessing hydrocarbon resource potential in such reservoir systems. The dual-porosity model treats the two types of pores separately and derives the resource estimates from different sources of data, thus better characterizing unconventional reservoirs with complicated pore systems. The new method also has the flexibility of assessing resource potential for the entire spectrum of mixed lithologies ranging from a complete tight to a pure source rock (organic - rich shale/mudstone) reservoir. The proposed method is illustrated through the assessment of the in-place petroleum resource potential in the Upper Ordovician Utica Shale of southern Quebec, Canada. The results of the application suggest that the proposed approach effectively handles the two pore systems in tight-shale reservoirs effectively and provides a useful tool for estimating resource potential in unconventional plays.
Summary(Plain Language Summary, not published)
Unconventional tight-shale reservoirs commonly display a mixed lithology from tight sandstone to organic rich mudstone. Such a resource play is usually a closed petroleum system with petroleum originating from the organic-rich shale and being stored within the stratigraphic interval that includes the tight reservoir. Matrix porosity may provide the principal storage for expelled petroleum, but additional petroleum remains within organic pores in the source rock. The matrix and organic pores have distinct physical and chemical properties. Assessing the resource potential in such a reservoir is challenging because conventional volumetric approaches consider only the dominant porous media. This paper proposes a dual porosity model for assessing hydrocarbon resource potential in reservoir with mixed porosities. The new approach is illustrated by assessing hydrocarbon resource potential in the Upper Ordovician Utica Shale of southern Quebec.