scholarly journals The Morag Field, Block 16/29a, UK North Sea

2020 ◽  
Vol 52 (1) ◽  
pp. 897-905 ◽  
Author(s):  
J. G. Gluyas ◽  
M. Słowakiewicz ◽  
M. E. Tucker ◽  
P. Gutteridge
Keyword(s):  
Salt Dome ◽  
High Flow ◽  
Upper Permian ◽  
Fault Block ◽  
Start Up ◽  
Stock Tank ◽  
Black Oil ◽  
Single Well ◽  
Sandstone Reservoir ◽  
Zechstein Salt

AbstractThe Morag Field is a small oilfield underlying the Maureen Field in UK Block 16/29a. Black oil is trapped within Upper Permian, Morag Member, vuggy and fractured dolomite rafts between 9300 and 10 600 ft true vertical depth subsea. The dolomite reservoir occurs at the top of a Zechstein salt dome. Morag was discovered in 1979 by well 16/29a-A1, the first platform well drilled for the overlying Maureen Field with its Paleocene sandstone reservoir. Morag was produced via a single well (16/29a-A1) between 1991 and 1994. Three more platform wells were drilled into the Permian interval prior to Maureen Field start up but only one penetrated oil-bearing dolomite (16/29a-A2). An additional well (16/29a–A23Z) was drilled into the Morag Field in 1993. The well encountered Morag Member at virgin pressure and tested oil at high flow rate but then the well failed due to mechanical problems. Oil in place was calculated to be about 24 MMbbl in four independent fault blocks. Ultimately 16/29a-A1 delivered 2.6 MMbbl from a fault block calculated to have held 6.7 MMbbl stock tank oil initially in place.

scholarly journals The formation of the Voldum salt pillow in the Danish Zechstein basin, Jutland (Denmark)

1999 ◽  
Vol 46 ◽  
pp. 31-46
Author(s):  
Ivan Madirazza
Keyword(s):  
Late Jurassic ◽  
Gravity Data ◽  
Upper Permian ◽  
Permian Basin ◽  
Salt Accumulation ◽  
Sequence Of Events ◽  
Thick Overburden ◽  
Well Data ◽  
A Minor ◽  
Zechstein Salt

On the basis of seismic and well data, supported by Bouguer gravity data, the sequence of events leading to the formation of a Zechstein salt pillow – called Voldum – in east central Jutland is discussed (the study area is delimited in Fig. 1). The initial salt movements, activated by faulting in the Triassic, resulted in the formation of a minor salt pillow on the edge of a graben within the Zechstein (Upper Permian) basin. During a renewed faulting (Voldum fault) of the base Zechstein in Late Jurassic and consequent deepening of the graben, a syncline developed above the salt where thick sediments of Late Jurassic age accumulated. In the process large quantities of salt, due to differential loading, withdrew from the graben and moved laterally up-dip across the older fault scarps. Thus a new and larger salt accumulation (Voldum pillow) formed above the southern flank of the graben. A relict Triassic thin, formed during the growth of the first pillow, remains, but no salt accumulation which could account for this thin is present. The Voldum pillow continued to grow during the Cretaceous and the Tertiary, but the speed of growth decreased considerably during post-Late Cretaceous times, although there are still large quantities of, virtually undisturbed, salt present south of the pillow in the part of the basin corresponding to the Silkeborg Gravity High. The graben area apparently underwent a mild inversion at the close of the Cretaceous. The reasons why the Voldum pillow did not develop into a diapir are considered to be a strong and thick overburden which existed at the beginning of the Voldum pillow formation, the deeply buried salt which probably acted as a deterrent to the rupture of the overburden, and the nature of the Voldum fault which, apparently, had an appreciable strike-slip component in dextral sense.

The Armada development, UK Central North Sea: The Fleming, Drake and Hawkins Gas-Condensate Fields

2003 ◽  
Vol 20 (1) ◽  
pp. 139-151 ◽  
Author(s):  
I. A. Stuart
Keyword(s):  
Maximum Yield ◽  
Upper Jurassic ◽  
Salt Dome ◽  
Gas Condensate ◽  
Project Design ◽  
Surface Site ◽  
Shallow Marine ◽  
The North ◽  
Fault Block ◽  
Central North Sea

abstractIn 1994 the Armada partnership sanctioned the simultaneous development of the Fleming, Drake and Hawkins Gas-condensate Fields by means of shared facilities; the overall project was called the Armada Development. The operator is BG International (formerly British Gas). The development was interesting because the component fields are not only separate accumulations, but are of completely different geological type.The Fleming Field is a Palaeocene, Maureen Formation high-density turbidite reservoir, sourced from the north but pinching out eastwards against the N S Utsira/Jaeren High and Hawking-Varg Ridge, and therefore forming a 20 km long, continuous, but very narrow reservoir. The drake Field is an Upper Jurassic. Fulmar Formation, shallow marine, shore-face reservoir, with excellent reservoir quality in a compact fault block. The Hawkins Field reservoir is poorer quality Fulmar Formation, typical of a more distal setting; the trap is formed by closure over a salt dome, and the structure is consequently quite heavily faulted.The challenge was to develop these disparate reservoirs from a single surface site. to capture the askward shape of Fleming and the distance between Drake and Hawkins. This was achieved by means of extended each drilling; although the high cost of such wells meant that every one had to be designed for maximum yield. Overall eifht wells were drilled, five to Fleming, two to Drake and one to Kawkins (these numbers being approximately proportional to gas-in-place). These wells are capable of delivering the project design peak rate of 450 mmscfd off-platform (equivalent to about 480 mmscfd reservoir gas), and up to 24000 BOPD condensate. Armada began production on schedule in October 1997.

scholarly journals Half a century of research on diatoms in athalassic habitats in central Poland

2015 ◽  
Vol 44 (1) ◽  
Author(s):  
Joanna Żelazna-Wieczorek ◽  
Rafał M. Olszyński ◽  
Paulina Nowicka-Krawczyk
Keyword(s):  
Temporal Change ◽  
Habitat Type ◽  
Chloride Concentration ◽  
Upper Permian ◽  
Central Poland ◽  
Wide Range ◽  
Salinity Levels ◽  
Zechstein Salt ◽  
Halophilic Species ◽  
The Village

AbstractPart of the geology in the Łódź province was formed during the Upper Permian period when rich Zechstein salt was deposited. Groundwater drains the deposits and flows out in the village of Pełczyska, creating a unique hydrogeological site in Central Poland. An inland, athalassic ecosystem can be a reference site for halophile microflora. The outflow with surrounding marshes has been an algological research site since 1964.The research reveals changes recorded in diatom assemblages from athalassic habitats, characterized by a wide range of salinity levels, and verifies the tolerance of taxa to salinity. The comparative analysis was based on the diatom material sampled in 1964-1965, 1992-1994 and on recently collected samples.The analysis revealed the temporal change in assemblages caused by a change in the chloride concentration, and the spatial change from one to another habitat type, characterized by varying salinity levels. The halophilic species in the studied habitats included e.g. Halamphora dominici, H. tenerrima, Navicula digitoconvergens, N. meulemansii, Staurophora salina. The analysis of changes allowed the verification of the species’ requirements and tolerance range to the salinity factor. Therefore, in the case of Fragilaria famelica and Halamphora sydowii, we propose a change in the halobion system classification.

The Cyrus Field, Block 16/28, UK North Sea

1991 ◽  
Vol 14 (1) ◽  
pp. 295-300 ◽  
Author(s):  
D. G. Mound ◽  
I. D. Robertson ◽  
R. J. Wallis
Keyword(s):  
North Sea ◽  
Field Development ◽  
Fine Grained ◽  
The North ◽  
Offshore Production ◽  
Fault Block ◽  
Single Well ◽  
The North Sea ◽  
Net To Gross ◽  
The Uk

AbstractThe Cyrus Oilfield is located in Block 16/28 of the UK sector of the North Sea approximately 250 km (155 miles) NE of Aberdeen and 55 km (34 miles) NE of the Forties Field. The trap consists of a broad, very low relief four-way dip closure developed over a deeper tilted fault block. The reservoir consists of submarine-fan sandstones of late Palaeocene age, belonging to the Andrew Formation. Provenance was to the NW resulting from the early Tertiary sea-level fall which exposed the East Shetland Platform. The reservoir has been sub-divided into two zones, an upper zone of interbedded sandstones and mudstones with net to gross ratios of 0.4 to 0.6 and sandstone porositites of 12% to 18%, and a lower zone of massive fine-grained sandstones plus subordinate thin shales and limestones, with net to gross ratios in excess of 0.9 and porosities averaging 20%. The reservoir is filled with undersaturated oil of 35° API and is normally pressured. The estimate of initial oil-in-place is 75 MMBBL. Development of the field is centred on the use of BP's SWOPS (Single Well Offshore Production System) vessel using two horizontal field development wells which feed into a single seabed template for offtake. Ultimate recovery from the field is estimated to be approximately 12 MMBBL.

scholarly journals Lithium Occurrences in Brines from Two German Salt Deposits (Upper Permian) and First Results of Leaching Experiments

Minerals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 766
Author(s):  
Michael Mertineit ◽  
Michael Schramm
Keyword(s):  
Upper Permian ◽  
Northern Germany ◽  
First Results ◽  
Salt Minerals ◽  
Leaching Experiments ◽  
Zechstein Salt ◽  
Saline Solutions ◽  
Mg Content ◽  
Fluid Interaction ◽  
Li Content

Lithium occurrences were detected in Upper Permian (Zechstein) salt rocks and saline solutions of the Gorleben and Morsleben salt structures, northern Germany. The brine occurrences were mainly connected to anhydrite rock-bearing formations and to lithological boundaries. Most of these brines display a high Mg content and were accordingly interpreted as intrasalinar solutions, which developed during sedimentation, diagenesis, and the subsequent rock–fluid interaction. These Mg-rich brines frequently show high Li concentrations. One of the assumptions made, is that Li was leached from phyllosilicates, since no natural Li-bearing salt minerals are known to date. To improve the understanding of the origin of Li in the brines, leaching experiments were performed on the Li-bearing phyllosilicate Lepidolite. Lepidolite with a Li content of 2.42 wt. % served as an analogue material, which was exposed to 18 saline solutions of different composition for a period of three years. The most pronounced leaching effect (53.36 µg Li/g in the brine) was observed during the interaction with a 0.03 mol/kg H2O MgCl2 solution, the second most pronounced by modern seawater interaction. The experiments show that the amount of Li leached from the lepidolite is dependent on brine composition.

Origin of Stylolites in Upper Permian Zechstein Anhydrite (Gorleben Salt Dome, Germany)

2000 ◽  
Vol 70 (3) ◽  
pp. 726-737 ◽  
Author(s):  
G. Bauerle ◽  
O. Bornemann ◽  
F. Mauthe ◽  
D. Michalzik
Keyword(s):  
Salt Dome ◽  
Upper Permian

Successful Implementation of a Single Well Chemical Tracer SWCT Test for a Giant Sandstone Reservoir in North Kuwait

2019 ◽  
Author(s):  
Mohammed T. Al-Murayri ◽  
Dawood S. Kamal ◽  
Reem S. Al-Abbas ◽  
Gordon T. Shahin ◽  
Greg A. Chilek ◽  
...  
Keyword(s):  
Successful Implementation ◽  
Chemical Tracer ◽  
Single Well ◽  
Sandstone Reservoir
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