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chalk

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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/PGC8.24
EISBN: 9781786203151
.... Chalks of the NW European and Central Asian realm represent one of the largest carbonate systems that ever occurred in geological history. First appearing in the Late Hauterivian and Barremian of the Central North Sea Basin ( Thomsen 1987 ; Thomsen & Jensen 1989 ), chalks became the dominant...
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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/PGC8.35
EISBN: 9781786203151
... gas field (A6-A) and oil shows in Chalk sediments of the Central Graben can be explained by our model. The authors thank the companies organized in the industrial association BVEG (Bundesverband Erdgas, Erdöl und Geoenergie BV), Uniper and BP for permission to use their datasets for scientific...
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Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP403.1
EISBN: 9781862396791
... chalk facies are complex and imply a range of depositional processes including pelagic fallout, debris flows and turbidity currents. These chalk deposits have an impact on the interpretation of amplitude-based seismic attribute volumes. Detailed petrophysical mapping, supported by seismic analysis...
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Series: GSA Special Papers
Published: 01 December 2011
DOI: 10.1130/2011.2483(19)
... structural and lithological features: overturned crystalline rim flap; slumped interior megablock terrain; central polymict breccia (originating as near-field ejecta); interior marine chalk deposits and reworked glauconitic sands (formed by resurge and postimpact deposition); and a collapsed southern part...
Journal Article
Published: 01 December 2008
Clays and Clay Minerals (2008) 56 (6): 693-710.
...Holger Lindgreen; Victor A. Drits; Finn C. Jakobsen; Boris A. Sakharov Abstract Upper Cretaceous–Danian chalk and interbedded clay-rich layers from wells of the South Arne Field and adjacent wells in the North Sea and from Stevns in Zealand have been investigated to determine the clay mineralogy...
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Series: GSA Reviews in Engineering Geology
Published: 01 January 2002
DOI: 10.1130/REG15-p257
EISBN: 9780813758152
... Table 1. Stratigraphy of the Upper Cretaceous (After Birkelund, et al., 1984) Stage Maastrichtian Campanian Santonian Coniacian Turanian Cenomanian Note: Relationships to the earlier, now informal terminology of Lower, Middle and Upper Chalk...
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Journal Article
Published: 01 September 2000
Bulletin de la Société Géologique de France (2000) 171 (5): 533-544.
...Christian Di Giovanni; Jean-Robert Disnar; Vincent Bichet; Michael Campy Abstract Optical analysis (palynofacies) of the organic matter (OM), occurring in various compartments (soils, bedrock formations, lacustrine chalks) of the lacustrine basin of Chaillexon (Doubs, France) has led...
Journal Article
Published: 01 September 2000
Bulletin de la Société Géologique de France (2000) 171 (5): 569-576.
...Benoit Laignel; Robert Meyer Abstract In NW Europe, chalk areas are generally covered with clay-with-flints (CWF). These formations are made of flints with a clayey or silty-clayey matrix. In the literature devoted to CWF, the flint dissolution during the weathering of chalk was poorly studied...
Journal Article
Published: 01 August 2000
Quarterly Journal of Engineering Geology and Hydrogeology (2000) 33 (3): 201-212.
...M. C. Matthews; C. R. I. Clayton; A. V. D. Bica Abstract This paper reports the results of a series of pull-out tests performed on mini-piles in chalk. Also reported are load–displacement data for similar piles when used in a group, for anchoring large-diameter plate loading test equipment...
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Journal Article
Published: 01 August 2000
Quarterly Journal of Engineering Geology and Hydrogeology (2000) 33 (3): 227-239.
... of the methodology by the author proved it to be robust, adaptable and highly successful if applied carefully, albeit for sources predominantly in the Chalk aquifer. However, various issues were identified which are considered further in this paper. A basic understanding of the methodology is assumed. However...
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Journal Article
Journal: AAPG Bulletin
Published: 01 July 2000
AAPG Bulletin (2000) 84 (7): 997-1014.
...E. Rosenthal; G. Weinberger; A. Almogi-Labin; A. Flexer Abstract The Mt. Scopus Group in Israel consists of chalk, chert, phosphorite, organic-rich carbonate (locally known as oil shale), and shale of Coniacian- Paleocene age. The rock sequence includes several rock units, including the En-Zeitim...
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Journal Article
Published: 01 May 2000
Quarterly Journal of Engineering Geology and Hydrogeology (2000) 33 (2): 125-140.
...M. C. Matthews; C. R. I. Clayton; J. Rigby‐Jones Abstract Dissolution features are common in the Chalk and may result in differential or collapse settlement of foundations if undetected. Dissolution pipes and cavities may be easily missed by conventional drilling methods. Probing and geophysical...
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Journal Article
Published: 01 May 2000
Journal of Micropalaeontology (2000) 19 (1): 60.
... , T. R. & Parker , W. K. 1872 . Notes on Eley’s foraminifera from the English Chalk . Geological Magazine , 9 : 123 – 126 . Loeblich , A. R. Jr. & Tappan , H. 1987 . Foraminiferal Genera and their Classification . Volume 1 . Van Nostrand Reinhold Company , New...
Journal Article
Journal: Geology
Published: 01 April 2000
Geology (2000) 28 (4): 319-322.
... Program sites (1049, 1050, and 1052) located on Blake Nose (30°N, 75°W) off eastern Florida in water depths of 1300–2600 m. Maastrichtian chalk is folded and fractured below the K-T boundary at all three sites, whereas lowermost Paleocene clays and chalks are undeformed. Deformation is pervasive...
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Journal Article
Published: 01 March 2000
Petroleum Geoscience (2000) 6 (1): 1-13.
... 1999 2000 hydrocarbon potential North Sea Chalk seismic data geostatistical analysis porosity saturation distributions The area of the present study is the west flank of the Dan Field, Danish Central Graben, North Sea ( Fig. 1 ). The Dan Field is an oil field with a gas cap...
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Journal Article
Journal: Clay Minerals
Published: 01 March 2000
Clay Minerals (2000) 35 (1): 175-184.
...F. JAKOBSEN; H. LINDGREEN; N. SPRINGER Abstract In the Maastrichtian-Danian chalk in the North Sea, discrete intervals, appearing as normal white chalk, contain up to 60% α-quartz <2 μm in size. Atomic force microscopy (AFM) reveals that the particles are of nm size, appearing as spherical...
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Journal Article
Published: 01 November 1999
Petroleum Geoscience (1999) 5 (4): 321-336.
... deposits are close to normal compaction, whereas anomalies for the lower Cenozoic sediments outline a zone of undercompaction in the Central North Sea that corresponds to the overpressure in the Upper Cretaceous-Danian Chalk. The overpressure results from a balance between the load of the upper Cenozoic...
Journal Article
Published: 01 November 1999
Petroleum Geoscience (1999) 5 (4): 373-384.
... are described. These comprise limestones (Ireland), sandstones (Norway and Saudi Arabia) and chalk (Denmark). These are used with existing information from the literature to review the major controls and scaling behaviour of fracture systems expected in reservoir rocks. Lithological layering was found...
Journal Article
Published: 01 November 1999
Bulletin de la Société Géologique de France (1999) 170 (6): 915-926.
...Franck Hanot; Medard Thiry Abstract The high-resolution seismic survey of the eastern Paris Basin shows steep disharmonic reflectors within the chalk related to diagenetic structures and coming with important thickness variations of the chalk and the overlaying Tertiary. These structure are related...
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1999
AAPG Bulletin (1999) 83 (9): 1485-1501.
...-wave velocity (vertical and horizontal), and acoustic impedance characterize five successive diagenetic stages: (1) compaction of ooze, (2) breakage and dissolution of fossil tests, (3) formation of chalk through precipitation of calcite, (4) cementation, and (5) compaction of calcite crystals. Age...
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