Nonequilibrium adsorption of surfactants onto reservoir cores from the North Sea. The effects of oil and clay minerals

1991 ◽  
Author(s):  
T. Austad ◽  
P. A. Bjørkum ◽  
T. A. Rolfsvag ◽  
K. B. Øysæd
Keyword(s):  
Clay Minerals ◽  
North Sea ◽  
The North ◽  
The North Sea

Volcanogenic clays in Jurassic and Cretaceous strata of England and the North Sea Basin

Clay Minerals ◽  
2000 ◽  
Vol 35 (1) ◽  
pp. 25-55 ◽  
Author(s):  
C. V. Jeans ◽  
D. S. Wray ◽  
R. J. Merriman ◽  
M. J. Fisher
Keyword(s):  
Clay Minerals ◽  
Clay Mineral ◽  
North Sea ◽  
Volcanic Ash ◽  
Hydrothermal Fluids ◽  
Mineral Deposits ◽  
The North ◽  
Clay Deposits ◽  
The North Sea ◽  
Thermal Doming

AbstractThe nature and origin of authigenic clay minerals and silicate cements in the Jurassic and Cretaceous sediments of England and the North Sea are discussed in relation to penecontemporaneous volcanism in and around the North Sea Basin. Evidence, including new REE data, suggests that the authigenic clay minerals represent the argillization of volcanic ash under varying diagenetic conditions, and that volcanic ash is a likely source for at least the early silicate cements in many sandstones. The nature and origin of smectite-rich, glauconite-rich, berthierine-rich and kaolin-rich volcanogenic clay mineral deposits are discussed. Two patterns of volcanogenic clay minerals facies are described. Pattern A is related to ash argillization in the non-marine and marine environments. Pattern B is developed by the argillization of ash concentrated in the sand and silt facies belts in the seas bordering ash-covered islands and massifs. It is associated with regression/ transgression cycles which may be related to thermal doming and associated volcanism, including the submarine release of hydrothermal fluids rich in Fe. The apparent paucity of volcanogenic clay deposits in the Jurasssic and Early Cretaceous sediments of the North Sea is discussed.

scholarly journals 7th Cambridge Diagenesis Conference 2011: an introduction

Clay Minerals ◽  
2014 ◽  
Vol 49 (2) ◽  
pp. 125-126
Author(s):  
C. V. Jeans ◽  
N. J. Tosca
Keyword(s):  
Clay Minerals ◽  
North Sea ◽  
Special Issue ◽  
Fundamental Study ◽  
Oil Companies ◽  
The North ◽  
Research Institutes ◽  
The North Sea ◽  
Set Up ◽  
Natural Laboratory

The Cambridge Diagenesis Conferences (1981–1998) were set up to act as a conduit for the interchange of clay mineral expertise between universities and research institutes on one hand, and the hydrocarbon industry on the other. At the time, oil companies were dealing with the development of the North Sea Oil Province which was turning out to be a natural laboratory for the fundamental study of authigenic clay minerals and their relationship to lithofacies, burial, overpressure, reservoir quality and hydrocarbon emplacement. This symbiosis between industry and academia flourished for nearly two decades. Each conference was followed by a special issue of Clay Minerals dealing with topics relevant to, or discussed at the particular meeting. By the late 1990s the North Sea had become a mature province and the major oil companies were looking to other parts of the world to replenish their reserves.

scholarly journals Silica diagenesis and its effect on porosity of upper Maastrichtian chalk – an example from the Eldfisk Field, the North Sea

1969 ◽  
Vol 20 ◽  
pp. 47-50
Author(s):  
Heine Buus Madsen
Keyword(s):  
Clay Minerals ◽  
North Sea ◽  
Silicate Minerals ◽  
The North ◽  
Silica Diagenesis ◽  
The North Sea ◽  
Upper Maastrichtian

Diagenetic precipitation of silicate minerals such as quartz and clay minerals can reduce the permeability and porosity of chalk as they precipitate as cement in pores (e.g. Taylor & Lapré 1987; Maliva & Dickson 1992). However, the precipitation can also result in early lithification and help to preserve porosity during burial.

Clay minerals of the Permian Rotliegend Group in the North Sea and adjacent areas

Clay Minerals ◽  
2006 ◽  
Vol 41 (1) ◽  
pp. 355-393 ◽  
Author(s):  
K. Ziegler
Keyword(s):  
Clay Minerals ◽  
Clay Mineral ◽  
North Sea ◽  
Meteoric Water ◽  
Regional Distribution ◽  
Burial History ◽  
The North ◽  
Wide Range ◽  
The North Sea ◽  
Arid Desert

AbstractThe nature, distribution and origin of clay minerals in the hydrocarbon-bearing Permian Rotliegend sandstones of the North Sea and the adjacent areas of the Netherlands and Germany are reviewed. The clay minerals occur as detrital coatings of smectite and smectite-illite on the surfaces of sandgrains, and as later diagenetic cements of kaolinite, chlorite (two varieties), and illite in the pore spaces of those sandstones. Two diagenetic clay mineral assemblages are predominant in the Rotliegend of the North Sea. The kaolinite-illite assemblage is restricted to the Rotliegend of shelf areas which underwent shallow burial followed by strong Jurassic/Cretaceous (Late Cimmerian) structural inversions, whereas the illite-chlorite assemblage is associated with basinal areas that underwent deep and rapid burial throughout the Mesozoic.The factors controlling mineralogy, crystal chemistry and morphology of those diagenetic clay minerals, as well as their regional distribution and origin, are numerous, complicated, and inter- related. Evidence suggests that the following aspects were important parameters: (1) variations in the original depositional arid desert environment; (2) the chemistry and flow patterns of the porewaters; (3) temperature and timing of clay mineral formation; (4) local burial history; (5) the presence or absence of meteoric water; and (6) the structural setting of the Rotliegend sandstones.Oxygen isotope data indicate that the illite cements formed over a wide range of temperatures (24–140°C) that is consistent with the deep burial conditions prevailing in the palaeo-basins. In contrast, oxygen isotopes indicate that kaolinite cements formed over a more restricted temperature range (40–80°C) and under the influence of meteoric water penetrating the sandstones of the shelf areas as a result of their Late Cimmerian uplift and associated erosion. Hypotheses suggesting that the absence of kaolinite cement from the deeply buried Rotliegend sandstones is caused by its illitization during burial, and that the chlorite cements have formed by the alteration of earlier smectite, smectite-chlorite and corrensite cements, are not supported by evidence.

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