Stellar Resources - Independent Assessment of Horse Hill Licence Area
RNS Number : 0857X
Stellar Resources PLC
26 August 2015

26 August 2015

Stellar Resources plc

("Stellar Resources" or the "Company")

Schlumberger Independent Assessment of Horse Hill Licence Area

The Board of Stellar Resources plc (AIM: STG) announces that a mean Oil in Place ("OIP") of 10.993 billion barrels has been independently calculated by Schlumberger to lie within the 55 square miles of the PEDL137 and PEDL246 Horse Hill licences ("the Licence Area") in the Weald Basin, located in the South East of England. Stellar Resources has a net attributable interest of 6.5% in the Licence Area.

The tight Jurassic limestones and shales of the Kimmeridge Clay Formation in the Licence Area are calculated to contain a total OIP of 8.262 billion barrels, with the shales of the Oxford Clay and Lias Formations containing an aggregate OIP of 2.731 billion barrels, as shown in Table 1.

Table 1: Licence Area mean OIP estimates, millions of barrels ("MMBO")



Kimmeridge Clay


Oxford Clay






Schlumberger acquired the Horse Hill-1 well ("HH-1") electric logs during the drilling of HH-1. This analysis builds on their previous petrophysical evaluation of HH-1, located in PEDL137 near to London Gatwick Airport, as announced on 5 June 2015. In that previous HH-1 analysis, a total mean OIP, excluding the Upper Portland sandstone oil discovery, of 255 million barrels of oil per square mile was calculated. The current report incorporates the analysis of a further nine wells located within and beyond the Licence Area.

It should be noted, as previously reported, that the HH-1 Upper Portland sandstone oil discovery is a geologically separate oil accumulation from, and additional to, the identified underlying Jurassic tight oil plays.

As previously stated by the Company, the above estimated OIP hydrocarbon volumes should not be construed as recoverable resources or reserves and also should not be construed in any way to reflect potential producibility of hydrocarbons from the formations evaluated. The Company would expect to report estimated recoverable resources following a successful well flow test, in order to comply with the standards of the Society of Petroleum Engineers' 2007 Petroleum Resources Management System.

The report's findings will now be integrated into the planned flow test of HH-1 expected later this year, subject to approval by the Environment Agency. This is another key step in the proof of concept process for Jurassic tight oil and the Kimmeridge limestone reservoirs in particular.

Additional internal and external technical studies are now well advanced in order to fully understand the possible implications of the report's key findings upon the hydrocarbon potential of the Weald Basin.

Donald Strang, Stellar Resources' Chairman, commented:

"Schlumberger's report for the HH licences has calculated OIP 19% higher than Nutech's equivalent OIP estimate. These two specialist companies have therefore independently confirmed the significance of the tight oil Jurassic resource play in the Weald Basin. As with Nutech's analysis, Schlumberger used a number of wells in the Weald Basin in deriving their estimate. Stellar Resources looks forward to moving ahead with the planned Horse Hill-1 flow test."

Future Plans:

In parallel with its subsurface and HH-1 flow test studies for the Portland sandstone and underlying tight Jurassic oil zones, related engineering and environmental studies have been commissioned to investigate a conceptual Weald Jurassic field development, with the prime objective that it must respect and preserve the rural beauty and way of life of the area, with minimal environmental impact, while at the same time providing a valuable contribution to the area's economy.

 Stellar Resources' interest in the Licence Area and Horse Hill:

The Licence Area, comprising licences PEDL137 and PEDL246, is located on the northern side of the Weald Basin of South East England near Gatwick Airport. The HH-1 discovery well is located in PEDL137. Stellar Resources owns a 10% direct interest in Horse Hill Developments Ltd ("HHDL"). HHDL is a special purpose company that owns a 65% participating interest and is the operator of the Licence Area. The remaining 35% participating interest in the Licence Area is held by Magellan Petroleum Corporation.

For further information please contact:


Stellar Resources plc

Donald Strang                                                                                                                   Tel: 020 7440 0640


Cairn Financial Advisers LLP

James Caithie / Sandy Jamieson / Carolyn Sansom                                          Tel: 020 7148 7900


Square 1 Consulting (Public Relations)

David Bick / Mark Longson                                                                                          Tel: 020 7929 5599



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

flow test

a flow test or well test involves testing a well by flowing hydrocarbons to surface, typically through a test separator. Key measured parameters are oil and gas flow rates, downhole pressure and surface pressure. The overall objective is to identify the well's capacity to produce hydrocarbons at a commercial flow rate


a sedimentary rock predominantly composed of calcite (a crystalline mineral form of calcium carbonate) of organic, chemical or detrital origin. Minor amounts of dolomite, chert and clay are common in limestones. Chalk is a form of fine-grained limestone


or expected value, is the probability-weighted average of all possible values and is a measure of the central tendency either of a probability distribution or of the random variable characterised by that distribution

oil in place

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


the study of physical and chemical rock properties and their interactions with fluids utilising electric logs, physical rock and fluid measurements


a set of known or postulated oil and or gas accumulations sharing similar geologic, geographic, and temporal properties, such as source rock, migration pathways, timing, trapping mechanism, and hydrocarbon type

recoverable resources

those quantities of petroleum (oil in this case) estimated, as of a given date, to be potentially recoverable from known accumulations


those quantities of petroleum anticipated to be commercially recoverable by application of development projects to known accumulations from a given date forward under defined conditions; reserves must further satisfy four criteria: they must be discovered, recoverable, commercial and remaining (as of the evaluation date) based on the development project(s) applied; reserves are further categorized in accordance with the level of certainty associated with the estimates and may be sub-classified based on project maturity and/or characterised by development and production status


a subsurface rock formation containing an individual natural accumulation of moveable petroleum


a clastic sedimentary rock whose grains are predominantly sand-sized. The term is commonly used to imply consolidated sand or a rock made of predominantly quartz sand


a laminated and fissile very fine-grained sedimentary rock, consisting of compacted silt and clay-size mineral particles. Can contain high proportions of organic material, which if subjected to heat and pressure over geological time can generate petroleum (a petroleum source rock)

tight oil play, or resource play

a play where oil is found or expected to be present within a reservoir with low permeability, i.e. a tight reservoir. The term, in the case of HH-1, is applied to a play where trapped petroleum accumulations are expected to be pervasive throughout a large area and that are not significantly affected by hydrodynamic influences (also called "continuous-type deposits").



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