... to the drains particle-facilitated subsurface transport of P and effects of slurry application, crop residues, and tillage on the amounts and forms of P in drain water The experiments were made on macroporous soil at the Røgen field site, Denmark. A number of laboratory studies made on undisturbed soil...

... be related to sonic velocity. However, the use of Biot's theory is commonly stymied by lacking information on pore-space parameters. Velocity-porosity relationships have been extensively studied ( Wyllie et al., 1956 ; Raymer et al., 1980 ; Nur et al., 1998 ; Prasad and Dvorkin, 2001 ; Røgen et al...

... ; Hjuler and Fabricius 2009 ). Fig. 1.— A) Maastrichtian chalk sampled for disaggregation at B) Sigerslev quarry located on C) Stevns Peninsula, Denmark. The sampled chalk belongs to the Sigerslev Member ( Surlyk et al. 2006 ) and directly overlies chalk with wavy and mound-like bedding...

... = ( 4 cos ( 1 3 arccos ( φ 8 2 π 3 − 1 ) + 4 3 π ) + 4 ) − 1 . Røgen and Fabricius (2002) also show applicability of Kozeny's equation for chalk on a larger data set. In this study of North Sea chalk, we use specific surface...

.... Samples were collected from several onshore and offshore localities in Denmark. Onshore quarries include Sigerslev near Copenhagen (SE Denmark; nine samples) and Rørdal near Aalborg (NW Denmark; 30 samples). Both localities expose Upper Maastrichtian chalk equivalent to the offshore Tor Formation...

... the Gassmann equation (the V S used in the equation is estimated based on the V P / V S ratio of chalks in a similar area [ Røgen et al., 2004 , 2005 ]). According to the relation between V P and IF in Figure  2b , the IF values can also be estimated...

... properties of chalk , in B. Røgen, ed., 2002 , North Sea chalk—Textural, petrophysical, and acoustic properties : Ph.D. thesis, Technical University of Denmark, Kgs . Lyngby, Denmark , p. 13 – 47 . Ruddy , I. , M. A. Andersen , P. D. Patillo , M. Bishlawi , and N...

...Ida L. Fabricius; Birte Røgen; Lars Gommesen Abstract Chalk samples from Dan, Tyra, South Arne, Valhall and Ekofisk fields were collected from hydrocarbon-bearing intervals in the Cretaceous Tor and Palaeogene Ekofisk formations in the central North Sea. The samples were compared with respect...

... in the depth trends and calibrate the theory with empirical data from a large set of high-quality chalk samples. Ida Lykke Fabricius is an associate professor at the Department of Environment and Resources, Technical University of Denmark. She works within petrophysics and rock physics of chalk...

.... , Critical porosity; a key to relating physical properties to porosity in rocks . Leading Edge , 17 1998 . 357 – 362 . Røgen , B. North Sea chalk – textural, petrophysical and acoustic properties . PhD thesis 2002 . Technical University of Denmark (DTU) . Røgen , B. , Fabricius...

... that the chalk's depositional texture varies from mudstone to packstone, and that it varies in silicate content and pore-filling cementation. The chalk's porosity is mainly interparticular, but it also has some intraparticular and minor moldic features ( Fabricius et al., 2003 , 2005 ; Røgen et al., 2005...

... better the controls on reservoir properties both on a field scale and regionally in the Danish Central Graben and, thus, ideally to improve oil recovery and productivity ( Christensen et al. 2002 ). This was a collaborative project between the Geological Survey of Denmark and Greenland (GEUS...

... samples, whereas measurements for the Valhall and Gorm samples were done only on dry rock as part of another study ( Røgen et al., 2004 ). Acoustic velocities were obtained in the laboratory with pulse-transmission method on 1-in plugs placed in a rubber sleeve in a core holder from New England Research...

... . Bulletin of the Geological Society of Denmark , 55 , 97 – 128 . Fabricius I.L. Røgen B. Gommesen L. 2007 . How depositional texture and diagenesis control petrophysical and elastic properties of samples from five North Sea chalk fields . Petroleum Geoscience , 13 , 81 – 95...

... OC 90 Lst c 8 Kenter et. al., 2002 Western GBB, ODP 166 Mio/Pliocene BH 306 Lst(dolo-calc) m 9 Rafavich et. al., 1984 North Dakota, U.S.A. Carboniferous BH 93 Lst(dolo-calc) c 10 Rogen et. al., 2005 North Sea, Denmark Cretaceous BH 56 Lst g 11 Schwab...

... and reservoir quality predictions ( Avseth et al., 2005 ). The primary geothermal target in this study is the sandstone-dominated upper Triassic-lower Jurassic Gassum Formation, which is currently being exploited for geothermal production and gas storage in Denmark ( Røgen et al., 2015 ; Kristensen et al...

... similar ( Monjoie & Schroeder 1989 ; Madland et al . 2002 ; Risnes et al . 2003 ). Table 2 Characteristics of chalk from Liège, Stevns Klint and Aalborg Chalk type Liège Stevns Klint Aalborg Quarry Hallembaye,Belgium Sigerslev,Denmark Roerdal,Denmark Age Campanian...

.... geol. Unders 1961 BA 18 Lundqvist J. Problems of the so-called Rogen moraine Sver. geol. Unders 1969 C648 1 32 Lundqvist J. Outlines of the Weichsel Glacial in Sweden Forth geol Foren Stockholm 1974 96 327 39 Lundqvist J. New information about early...

... to the explanation of what circumstances are responsible for the chalk in several localities to have become very important fine-grained aquifers and petroleum reservoirs (e.g., Burland et al., 1990 ; Røgen and Fabricius, 2002 ; Fabricius et al., 2007 ; Anderskouv and Surlyk, 2012 ). Therefore, nonreservoir...

... et al., 1997 ) and 12 columns from Exp. 2. All 21 soil columns were collected at the depth of 2 to 22 cm at the Røgen field station in the northeastern part of Jutland, Denmark. The soil is a sandy loam developed from moraine deposits and is classified as a Typic Hapludalf. Clay, silt, sand...