RNS Number : 1807V
UK Oil & Gas Investments PLC
24 October 2014

For Immediate Release

24 October 2014


UK Oil & Gas Investments PLC

("UKOG" or the "Company")


Portland Oil Discovery, Horse Hill-1, Weald Basin UK


UKOG today announces that, following preliminary evaluation of the electric logs, the Horse Hill-1 well has discovered an oil accumulation in the conventional Upper Jurassic Portland Sandstone at a top reservoir depth of 1,791 feet TVDss. 


A preliminary most likely estimate of 3.1 million barrels ("mmbbl") of gross in place hydrocarbon volume has been calculated within the upper Portland, with a further gross unrisked in place prospective hydrocarbon volume of 16.8 mmbbl of oil in a separate lower sand in the Portland interval located in an untested fault block to the south.  As previously announced, the well is being deepened to the Triassic where an additional target, believed to have potential for gas, is expected to be reached in the next two weeks.


The Portland Sandstone was previously reported on 16 October 2014 to have oil shows in cuttings and elevated gas readings whilst drilling and these indications have been confirmed by independent petrophysical analysis of the electric logs acquired in the well during the last week.  Further analysis is continuing to establish the recoverable volume of oil that has been discovered.


David Lenigas, the Company's Chairman, commented:


"We are very pleased with the results so far from this well.  The presence of a larger, unappraised, Portland feature creates considerable further upside.  We are now looking forward to drilling the Triassic, which is a new and untested exploration target in the area and which, if successful, may contain appreciable volumes of gas."


UKOG interest in Horse Hill


The Horse Hill-1 well is located on the northern side of the Weald Basin near Gatwick Airport.  UKOG owns a 20% direct interest in Horse Hill Developments Ltd ("HHDL") and an additional 2.4% interest in HHDL by virtue of its 6% ownership in Angus Energy Limited ("Angus Energy").  Angus Energy owns 40% of HHDL.  HHDL is a special purpose company that owns a 65% participating interest and operatorship of onshore licences PEDL 137 and the adjacent licence PEDL 246 in the UK Weald Basin.  The participants in the Horse Hill-1 well are HHDL with a 65% working interest and Magellan Petroleum Corporation with a 35% interest. UKOG's net attributable interest in PEDL 137 and 246 is therefore 14.56%.


Additional analysis:


The upper Portland Sandstone reservoir, which produces at the nearby Brockham oil field, was also intersected by the Collendean Farm-1 exploration approximately 790 metres north of the Horse Hill-1 well.   Using the solely available 2D seismic data and the well results, the operator has mapped an area of closure of approximately 3.8 square kilometres where the Portland Sandstone is above the observed oil down to at a depth of 1,901 feet TVDss.  The presence of two wells within the same mapped structural closure significantly increases the confidence in a commercial discovery and there is every indication that the Portland reservoir can be developed as a commercial oil field.


The gross oil bearing upper Portland Sandstone interval in Horse Hill-1 measures 102 feet, has an average porosity of over 16% and average oil saturation is estimated as 36%.  Based on regional and local trends, confirmed by wells at Brockham, these reservoir parameters indicate a high likelihood of production at commercial rates.  The equivalent interval in the Collendean Farm-1 well, drilled by Esso in 1964, shows similar reservoir characteristics over a 97 foot gross interval.  The gross oil column contained within the Horse Hill-Collendean Farm structure is in excess of 140 feet.


The lower Portland Sandstone reservoir, which is seen to be water wet in Horse Hill-1 and Collendean Farm-1, lies above the oil down to in an untested fault block to the south of the Horse Hill-1 well and is interpreted to contain an unrisked most likely in place gross oil volume of 16.8 mmbbl.


The Corallian Sandstone and Great Oolite targets in the Horse Hill-1 well are not seen on electric logging to contain moveable hydrocarbons, however, further evaluation of several thick Kimmeridgian-age limestones, which had hydrocarbon shows and elevated mud gas readings whilst drilling, may provide additional oil potential within the well.


Low, medium and high estimates of Portland oil in place are summarised in Table 1.


Table 1: Estimated gross in place discovered and undiscovered oil volumes


mmbbl, in-place-oil

Low (P90)

Medium (P50)

High (P10)










The gross in place hydrocarbon volumes have been prepared by Stephen Sanderson acting as the competent person on behalf of HHDL.


Volumes have been prepared using the methodologies and standards published by the Society of Petroleum Engineers.


The gross in place hydrocarbon volumes presented should not be considered as either contingent resources or reserves.

Competent Person's Statement

The information contained in this announcement has been reviewed and approved by Stephen Sanderson, Exploration Adviser to UKOG plc, who has over 33 years of relevant experience in the oil industry.  Mr. Sanderson is a Fellow of the Geological Society of London and is an active member of the American Association of Petroleum Geologists.



2D seismic

seismic data collected using the two-dimensional common depth point method

contingent resources

those quantities of petroleum estimated, as of a given date, to be potentially recoverable from known accumulations, but the applied project(s) are not yet considered mature enough for commercial development due to one or more contingencies. Contingent Resources may include, for example, projects for which there are currently no viable markets, or where commercial recovery is dependent on technology under development, or where evaluation of the accumulation is insufficient to clearly assess commerciality


a discovery is a petroleum accumulation for which one or several exploratory wells have established through testing, sampling and/or logging the existence of a significant quantity of potentially moveable hydrocarbons

electric logs

tools used within the wellbore to measure the rock and fluid properties of surrounding rock formations


million barrels

oil down to

the deepest level where oil saturation is measured at the base of a porous reservoir where it directly overlies rock of very low porosity and permeability where no reliable oil water contact can be established

oil in place

the quantity of oil or petroleum that is estimated to exist originally in naturally occurring accumulations before any extraction or production

oil saturation

the percentage of available pore space within the reservoir containing oil


a 10% probability that a stated volume will be equalled or exceeded


a 50% probability that a stated volume will be equalled or exceeded


a 90% probability that a stated volume will be equalled or exceeded


the percentage of void space in a rock formation, where the void may contain, for example, water or petroleum


those quantities of petroleum anticipated to be commercially recoverable by application of development projects to known accumulations at a given date forward under defined conditions


true vertical depth below a subsea datum


those quantities of petroleum which are estimated, as of a given date, to be contained within accumulations that have not been tested by drilling



For further information, please contact:


UK Oil& Gas Investments PLC

David Lenigas / Donald Strang

Tel: 020 7440 0640

Beaumont Cornish (Nominated Adviser)

Roland Cornish / Michael Cornish

Tel: 020 7628 3396

Hume Capital Securities PLC (Corporate Broker)

David Lawman

Tel: 020 7101 7070

Square 1 Consulting (Public Relations)

David Bick/Mark Longson


Tel: 020 7929 5599


A copy of this announcement is available from the Company's website at www.ukogplc.com




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