LICENCE RELINQUISHMENT REPORT
UKCS P1595
BLOCKS 48/2b & 48/3b
E.ON E&P UK LTD
February 2013
CONTENTS
a) LIST OF FIGURES
1) SUMMARY
2) LICENCE INFORMATION
3) PROSPECTIVITY
4) RESOURCES SUMMARY
5) CLEARANCE
LIST OF FIGURES
Fig 1
Fig 2
Fig 3
Fig 4
Fig 5
Southern North Sea Location Map
Licence P1595 Relinquishment Co-ordinates
Licence P1595 Seismic Database
Representative RTM Seismic Depth Line across Newton, Hawking & Dodgson
Block 48/2b Newton, Hawking & Dodgson shown on Top Rotliegendes Depth Map
1.0
SUMMARY
Licence P1595 comprises Blocks 48/2b & 48/3b (Fig 1, Fig 2), was awarded as a
Conventional 4 year Licence in the 25th Offshore Licensing Round effective 12th February
2009 to a group comprising E.ON E&P Ltd (E.ON) 50% and Dana Petroleum (Dana) 50%.
The licence work programme is complete.
Prospectivity is identified in, and restricted to, dry gas accumulations hosted in the
Rotliegendes Leman Sandstone. Typically for the Southern North Sea the hydrocarbon
hosted in this reservoir is a dry gas sourced in the underlying Westphalian Coal Measures,
with a short migration pathway to the Leman reservoir, sealed by Silverpit claystones and
Zechstein evaporites. A prospect (Newton), and two leads (Hawking & Dodgson) were
identified in the prospectivity review of the licence and a drill or drop decision was made in
late 2012 to relinquish the acreage.
The principal seismic dataset used in the evaluation was a pre-stack depth migration
(PrSDM) reprocessing of a number of surveys shown in Fig 3. The output area from this
reprocessing project was 560sqkm centered on the Babbage field with Newton situated on
the eastern side of the reprocessed area. The overburden to the Rotliegendes reservoir is
complex in some areas and the imaging is consequentially effected, so it was decided to
perform a reverse time migration (RTM) using the PrSDM velocity field in an attempt to
image the prospective horizon (Fig 3, Fig 4). Older datasets were used to provide regional
control.
The Newton prospect was targeted by well 48/3-4 that may have penetrated the downdip
eastern flank of the Newton structure. This well encountered a tight Leman interval with
residual gas.
The Hawking structure was discovered by well 48/2b-3 that encountered a low permeability
Leman section akin to Babbage.
The Dodgson structure is undrilled.
Dana withdrew from the licence in 2012 and E.ON took over the acreage at 100% equity. A
farm out process was undertaken during 2012 but no commercial deal was structured
between E.ON and other interested parties.
2.0
LICENCE INFORMATION
Licence
P1595
Blocks
48/2b & 48/3b
Conditions
Obtain and reprocess modern 3D seismic. Drill or drop
the licence before end of the first 4 year term.
Round Awarded
25th
Date Awarded
February 12, 2009
Date Relinquished
February 12, 2013
Operator
E.ON E&P UK Ltd (100%)
3.0
PROSPECTIVITY
Prospects and leads on Licence P1595 are named after British mathematicians and
physicists.
The principal dataset used in the evaluation was the 2010-2011 Babbage / P1595 PrSDM
and the RTM data that followed in early 2012. They comprise an area of 560km2 and cover
the full extent of P1595 and the Babbage FDA (Fig 3). The older datasets, which included
the Hess 48/1, Amoco 48/2 , Hess 48/3 and WG Spec 48/7 and 48/8 surveys, were input to
the reprocessing project as well as providing regional control for the seismic interpretation of
the licence. EON is a member of CDA and all available relevant well data were used in the
evaluation of the licence.
One prospect and two leads are identified on the licence. In all cases the hydrocarbon
source and migration pathway is from the underlying Coal Measures. In all cases the
reservoir is the Rotliegendes Lower Leman Sandstone. The regional seal for this part of the
Southern Gas Basin is the Zechstein evaporites, supplemented by the Silverpit claystones
directly overlying the Leman reservoir.
1) Newton is a tilted fault block with dip closure to the North, East and South, fault
bounded by a down to the West fault on its Western flank (Fig 5), which has been
largely de-risked by the RTM. Much of the Rotliegendes reservoir lies beneath a
zone of complex tectonics associated with the easterly extension of the salt wall that
overlies Babbage. A salt overhang lies above the northern flanks of Newton and
further complicates seismic depth conversion and potential drilling operations. The
structure may have already been tested by the 48/3-4 well drilled in 1988 by
Amerada Hess. This well encountered a low permeability, residual(?), gas bearing
Leman interval and was drilled close to the high case closing contour for the Newton
structure.
2) Hawking is a tilted fault block mirror imaging the Newton structure across a broad,
deep graben at Rotliegendes level (Fig 5). Hawking was tested by well 48/2b-3
drilled in 1997 by Mobil North Sea Ltd. The well encountered a Leman section very
similar in thickness to that in the producing Babbage field, and on test flowed at a low
rate (0.4 mmscfpd over a 10 hour period). The well was drilled through the E-W salt
wall overlying Babbage (Zechstein encountered at 2700 ftMD, top Rotliegendes at
10,105ftMD).
3) Dodgson is a low relief four-way dip closure mapped in the graben that separates
Newton from Hawking (Fig 5)
4.0
RESOURCES SUMMARY
Newton (OGIP)
Low 135BCF
Mid
264BCF
High 468BCF
Hawking (OGIP on Block)
Low 37BCF
Mid
58BCF
High 85BCF
Dodgson (OGIP)
Low 8BCF
Mid
19BCF
High 84BCF
5.0
CLEARANCE
E.ON E&P UK Ltd confirms that the Department of Energy and Climate Change is free to
publish the contents of this report.
Fig 1 Southern North Sea Location Map
Fig 2 Licence P1595 Relinquishment Co-ordinates
Fig 3 Licence P1595 Seismic Database
Fig 4 Representative RTM Seismic Depth Line Across Newton, Hawking & Dodgson
Fig 5 Block 48/2b Newton, Hawking & Dodgson shown on Top Rotleigendes Depth Map