Sand-grade density flow evolution on a shelf-edge-slope-basin-floor complex in the Upper Jurassic Olympen Formation, East Greenland

被引:12
作者
Bruhn, R [1 ]
Surlyk, F [1 ]
机构
[1] Univ Copenhagen, Inst Geol, DK-1350 Copenhagen, Denmark
关键词
East Greenland; Upper Jurassic; depositional architecture; sand-grade density flows; reservoir analogue;
D O I
10.1144/1354-079302-559
中图分类号
P [天文学、地球科学];
学科分类号
07 [理学];
摘要
The uppermost Callovian-Middle Oxfordian Olympen Formation is part of the early syn-rift succession of Jameson Land and Traill O, East Greenland and was deposited in prograding shelf-edge, slope and basin-floor environments. The formation consists of. (1) coarsening-upward units of sand-rich, prograding shelf-edge wedges; (2) slope and basin-floor mudstone; and (3) lenticular elongate and sheet-like, massive sandstone. bodies deposited by sedimentary density flows on the slope, base-of-slope and basin floor. Systematic spatial and temporal variations in sandstone body geometry reflect down-slope transformations of the density flows. Lenticular and down-slope elongate sandstones mainly occur randomly scattered within prograding shelf-edge sandstone and slope mudstone. They represent short-travelled, hyperconcentrated density flows, filling pre-existing gullies that formed by retrogressive slumping. Sheet-like sandstones encased in mudstone were deposited from unconfined, concentrated density flows transitional to turbidity flows at the base-of-slope and on the basin floor. The Olympen Formation provides a well-exposed example of a sand-dominated shelf-edge-slope-basin-floor dispersal system in which the down-slope transformation of sand-grade density flows and resultant sandbody geometries can be demonstrated effectively. It may serve as a useful field analogue for a poorly understood but important type of hydrocarbon reservoir.
引用
收藏
页码:81 / 92
页数:12
相关论文
共 55 条
[1]
[Anonymous], 1988, FAN DELTAS SEDIMENTO
[2]
Birkelund T, 1971, Bull geol Soc Denmark, V20, P240
[3]
BOURMA AH, 1962, SEDIMENTOLOGY SOME F
[4]
Callomon JH, 1993, B GEOL SOC DENMARK, V40, P83
[5]
SELF-LUBRICATION FOR LONG RUNOUT LANDSLIDES [J].
CAMPBELL, CS .
JOURNAL OF GEOLOGY, 1989, 97 (06) :653-665
[6]
CARR ID, 1998, THESIS U READING
[7]
Cheel R.J., 1993, Sedimentology review, V1, P103, DOI [DOI 10.1002/9781444304534.CH7, 10.1002/9781444304534.ch7]
[8]
CLIFTON HE, 1971, J SEDIMENT PETROL, V41, P651
[9]
THE STRUCTURAL FOUNDATION AND EVOLUTION OF MESOZOIC SEAWAYS BETWEEN EUROPE AND THE ARCTIC [J].
DORE, AG .
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 1991, 87 (1-4) :441-492
[10]
Engkilde Michael, 2003, Geological Survey of Denmark and Greenland Bulletin, V1, P813