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TitleHow sandstone porosity and permeability vary with diagenetic minerals in the Scotian Basin, offshore eastern Canada: implications for reservoir quality
AuthorZhang, Y; Pe-Piper, G; Piper, D J W
SourceMarine and Petroleum Geology vol. 63, 2015 p. 28-45,
Alt SeriesEarth Sciences Sector, Contribution Series 20140478
PublisherElsevier BV
Mediapaper; on-line; digital
File formathtml; pdf
ProvinceEastern offshore region
NTS10N; 10O; 11B; 11C
AreaScotian Shelf; Scotian Basin
Lat/Long WENS -62.0000 -57.0000 45.0000 43.0000
Subjectssedimentology; stratigraphy; geochemistry; sandstones; porosity; permeability; diagenesis; reservoir data; reservoirs; lithofacies; stratigraphic correlations; whole rock geochemistry; whole rock analyses; cluster analyses; basin analyses; Wyandot Formation; Banquereau Formation; Dawson Canyon Formation; Logan Canyon Formation; Missisauga Formation; Mic Mac Formation; Abenaki Formation; Mohican Formation; Cretaceous; Jurassic
Illustrationsgeological sketch maps; cross plots; photomicrographs; analyses
ProgramGeoscience for New Energy Supply (GNES), Frontier basin analysis
AbstractThe Scotian Basin is an under-explored offshore basin that has produced gas and minor oil from Jurassic-Cretaceous deltaic sandstones. Reservoir quality is an important exploration risk in the basin. This study evaluates whether there are systematic stratigraphic or geographic variations in diagenetic mineral assemblages control that relate to reservoir porosity and permeability. Three data sets are used: a compilation of all available core-plug porosity and permeability measurements (3271 in total), a subset of 577 corresponding to thin sections with lithofacies assignments, and a subset of 35 thin sections principally from reservoir sandstones, in which modal abundance of diagenetic minerals has been determined by image analysis of scanning electron microscope backscattered electron images. Abundances above a 4% threshold of diagenetic kaolinite, calcite and ankerite correlate inversely with permeability, but chlorite and possibly siderite correlate positively. Diagenetic assemblages show no systematic variation with stratigraphy or geography, both of which may involve variable detrital supply. Permeability shows the well-known variation with grain size and depth of burial, but after correcting for these effects it is greatest in estuarine channel and river-mouth turbidite sandstones. This is because these facies preferentially develop chlorite rims on detrital quartz grains and are also the sites of enhanced flow of late basinal fluids resulting in secondary porosity. Local effects such as facies distribution, architecture of channel sandstones, fluid pathways related to complex salt tectonics, and the effects of overpressure are more important than predictable basin-wide effects in controlling sandstone reservoir quality.
Summary(Plain Language Summary, not published)
This paper summarizes the range of diagenetic minerals in the Scotian Basin and explores their relationship to petroleum reservoir quality.