TY - JOUR
T1 - Diagenetic impact on reservoir sandstones of the Heno Formation in the Ravn-3 well, Danish Central Graben
AU - Pedersen, Simone
AU - Weibel, Rikke
AU - Johannessen, Peter N.
AU - Schovsbo, Niels H.
N1 - Funding Information:
mentation would have been expected in these quartz-rich sandstones (Bjørlykke et al. 1989) as they have been buried to a depth of > 4 km and hence exposed to temperatures of 112–117°C as documented by vitrinite reflectance. As no stylolites were observed and as quartz overgrowth precipitated before and alternating with illite growth, another source for silica must have been present prior to transformation of smectite to illite. The continued precipitation of quartz overgrowth was probably from a silica source from the transformation of smectite to illite and dissolution of K-feldspar (Hower et al. 1976; Boles & Franks 1979). This is supported by the honeycomb-structured smectite-illite coatings and partially dissolved detrital K-feldspar.
PY - 2018
Y1 - 2018
N2 - Oil and gas production from siliciclastic reservoirs has hitherto been
in the Danish Central Graben mostly from Palaeogene and Middle Jurassic
sandstone. The Ravn field was the first Upper Jurassic field to start
operation. The reservoir is composed of sandstone of the Heno Formation.
Production takes place at a depth of 4000 m, which makes Ravn the
deepest producing field in the Danish North Sea. The Heno Formation
mainly consists of marine shoreface deposits, where foreshore, middle
and lower shoreface sandstones constitute the primary reservoir. The
results of this study of the diagenetic impact on the mineralogical
composition, porosity and permeability are presented here.
Microcrystalline quartz has preserved porosity in the sandstone, whereas
illite, quartz overgrowth and carbonate cement have reduced both
porosity and permeability.
AB - Oil and gas production from siliciclastic reservoirs has hitherto been
in the Danish Central Graben mostly from Palaeogene and Middle Jurassic
sandstone. The Ravn field was the first Upper Jurassic field to start
operation. The reservoir is composed of sandstone of the Heno Formation.
Production takes place at a depth of 4000 m, which makes Ravn the
deepest producing field in the Danish North Sea. The Heno Formation
mainly consists of marine shoreface deposits, where foreshore, middle
and lower shoreface sandstones constitute the primary reservoir. The
results of this study of the diagenetic impact on the mineralogical
composition, porosity and permeability are presented here.
Microcrystalline quartz has preserved porosity in the sandstone, whereas
illite, quartz overgrowth and carbonate cement have reduced both
porosity and permeability.
UR - http://www.scopus.com/inward/record.url?scp=85069501632&partnerID=8YFLogxK
U2 - 10.34194/geusb.v41.4330
DO - 10.34194/geusb.v41.4330
M3 - Article
SN - 1604-8156
VL - 41
SP - 9
EP - 12
JO - Geological Survey of Denmark and Greenland Bulletin
JF - Geological Survey of Denmark and Greenland Bulletin
ER -
