Page 77 - An Atlas of Carboniferous Basin Evolution in Northern England

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Table 2. Carboniferous oil and gas fields of northern England Chapter 5

Field Year Province Play Fairway Sequence Trap Age/Type Oil (mmbbls) Gas (bcf) Total (mmboe)

Welton 1981 Gainsborough Clastic delta/
Qtz channel LClc/LC2 Variscan inversion 27.00 0.00 27.00
Beckingham/
Gainsborough 1959 Gainsborough Clastic delta LClc/LC2 Variscan inversion 13.20 6.50 14.36
West Firsby 1987 Gainsborough Clastic delta LClc Variscan inversion 7.00 0.00 7.00
Eakring 1939 E.M. Shelf Carbonate/Clastic delta EC6/LC1C/LC2 Variscan inversion 6.50 0.00 6.50
Glentworth 1961 Gainsborough Clastic delta LC2 Variscan inversion 4.10 0.00 4.10
Egmanton 1955 E.M. Shelf Clastic delta LClc Variscan inversion 3.50 0.00 3.50
Bothamsall 1958 E.M. Shelf Clastic delta LClc Variscan inversion 2.10 0.00 2.10
K. Misperton 1985 Cleveland Basin Clastic delta LClb Mesozoic extension 0.00 9.00 1.61
Scarnpton N. 1985 Gainsborough Clastic delta LClc Variscan inversion 1.80 0.00 1.80
Rempstone 1985 Widmerpool Clastic delta LClb Variscan inversion 1.15 0.70 1.27
Hatfield Moors 1981 Gainsborough Clastic delta LC2 Variscan inversion/ modified in Mesozoic 0.00 5.00 0.89
Long Clawson 1986 Widmerpool Clastic delta LClc Variscan inversion/ modified in Mesozoic 0.90 0.00 0.90
Corringham 1958 Gainsborough Clastic delta LClc/LC2 Variscan inversion 0.70 0.00 0.70
Nettleham 1983 Gainsborough Clastic delta LClc Variscan inversion 0.60 0.00 0.60
Plungar 1953 Widmerpool Clastic delta LClc Variscan inversion 0.60 0.00 0.60
S. Leverton 1960 Gainsborough Clastic delta LClc Variscan inversion 0.60 0.00 0.60
Trurnfleet 1957 Gainsborough Clastic delta LClc Variscan inversion/ modified in Mesozoic 0.00 2.70 0.48
Whisby 1985 E.M. Shelf Clastic delta LClc Variscan inversion/ stratigraphic 0.50 0.00 0.50
Crosby Warren 1986 Humberside Clastic delta LClc Variscan inversion 0.40 0.00 0.40
Kirklington 1985 E.M. Shelf Clastic delta LClc Variscan inversion 0.40 0.00 0.40
Caunton 1943 E.M. Shelf Clastic delta LClc Variscan inversion 0.30 0.00 0.30
Hatfield West 1983 Gainsborough Clastic delta LClc Variscan inversion/ modified in Mesozoic 0.00 1.30 0.23
Farley's Wood 1983 E.M. Shelf Clastic delta LClc Variscan inversion 0.20 0.00 0.20
Stainton 1984 Gainsborough Clastic delta LClc Variscan inversion 0.20 0.00 0.20
Malton 1970 Cleveland Basin Clastic delta LClc Variscan inversion 0.00 LOO 0.18
Cropwell Btlr 1984 Widmerpool Clastic delta LClc Variscan inversion 0.14 0.00 0.14
Kinoulton 1985 Widmerpool Clastic delta LClc Variscan inversion 0.13 0.00 0.13
Torksey 1962 Gainsborough Clastic delta LClc Variscan inversion 0.10 0.00 0.10
Calow 1956 Welbeck Low Clastic delta LClc Variscan inversion 0.00 0.50 0.09
Broughton 1984 Humberside Clastic delta LC2 Variscan inversion 0.08 0.00 0.08
Hardstoft 1919 Welbeck Low Carbonate EC6 Variscan inversion 0.05 0.00 0.05
Hernswell 1983 Gainsborough Clastic delta LClc/LC2 Variscan inversion 0.05 0.00 0.05
Scampton 1985 Gainsborough Clastic delta LClc Variscan inversion 0.03 0.00 0.03
Nooks Farm 1982 Goyt Trough Clastic delta LClc Variscan inversion 0.00 0.37 0.07
Belvoir 1986 Widmerpool Clastic delta LClc Variscan inversion 0.02 0.00 0.02

Trap geometry (sequences LClc/LC2). Recoverable reserves from the field are assessed at able reserves are assessed at 7 million barrels of oil, mainly reservoired in a
13 million barrels of oil, plus an additional 6.5 billion cubic feet of associated stacked series of delta-top channel and mouth bar sandstones of Namurian-
Focusing on the 36 or so oil and gas fields discovered in the Carboniferous of gas. The faulted anticlinal structure was formed by inversion on a series of early Westphalian age (sequence LClc).
northern England, nearly all of which are part of the clastic delta play (Table early syn-rift faults lying at depth within the Gainsborough Trough. Closure is
2), it is clear that Variscan deformation is a major factor in all the traps. Taking complicated by the presence of shallow, listric faults which apparently sole out Egmanton (Fig. 56)
the East Midlands as an example, it can be seen that the oil and gas fields show within pro-delta early Namurian shales. The Egmanton Field is an inversion anticline formed on a NW-SE-trending
a close relationship with the major fault trends (Fig. 11). Inspection of a depth Welton (Fig. 54) fault to the south of the Gainsborough Trough. The field was discovered in
converted regional seismic line across the province shows the major fields to lie Discovered in 1981, Welton is, to date, the largest hydrocarbon accumulation 1955 and recoverable reserves are assessed at 3.5 million barrels. The main
in the hanging-walls of faults active during the Dinantian rift phase (Fig. 12). in northern England. Reserves are now assessed at well over 20 million barrels. component of trap formation was again late Carboniferous (Variscan)
Sub-regional seismic lines with depth conversions are presented for several Production is mainly from delta-top channel sandstones within sequence LClc inversion, as indicated by marked erosional truncation at the base Permian
fields to illustrate the structural style associated with the trapping geometry. (Rothwell & Quinn 1987). Seismic data show the field to be a Variscan unconformity. However, the suggestion on seismic of subcropping Dinantian
For the location of the individual fields refer to Figure 11. events at the base of the LCI sequence may indicate a late Brigantian phase of
inversion structure.
inversion as well.
Beckingham/Gainsborough (Fig. 53) Eakring-Dukes Wood (Fig. 55)
The Beckingham/Gainsborough Field was discovered by BP in 1959 in a The field occurs as a series of en echelon inversion anticlines adjacent to the Calow (Fig. 57)
faulted series of stacked reservoirs of Namurian and Westphalian age NNW-SSE-trending Eakring-Foston Fault (Storey & Nash 1993). Recover- The Brimington anticline is perhaps the best example of a tight inversion fold