1P

Proved reserves

2P

Proved and probable reserves

3P

Proved and probable and possible reserves

Admission

Admission of the Ordinary Shares to listing on the main market of the London Stock Exchange on 17
December 2009. Also referred to as the "IPO" or the "Listing."

AGM

The annual general meeting of the Company is to be held on 21 June 2010. Also referred to as the "Annual
General Meeting."

API

American Petroleum Institute gravity

bbl

Barrels of oil

bpd

Barrels per day

C2

Category C2 reserves are preliminary estimated reserves of a deposit calculated on the basis of geological
and geophysical research of unexplored sections of deposits adjoining sections of a field containing
reserves of higher categories and of untested deposits of explored fields. Category C2 reserves are used
to determine the development potential of a field and to plan geological, exploration and production
activities.

C3

Category C3 resources are prospective reserves prepared for the drilling of (i) traps within the oil-andgas
bearing area, delineated by geological and geophysical exploration methods tested for such area
and (ii) the formation of explored fields which have not yet been exposed by drilling. The form, size and stratification conditions of the assumed deposit are estimated from the results of geological and geophysical research. The thickness, reservoir characteristics of the formations, the composition and the characteristics of hydrocarbons are assumed to be analogous to those for explored fields. Category C3 resources are used in the planning of prospecting and exploration work in areas known to contain other reserve bearing fields.

D1

Category D1 resources are calculated based on the results the region¹s geological, geophysical and
geochemical research and by analogy with explored fields within the region being evaluated. Category D1
resources are reserves in lithological and stratigraphic series that are evaluated within the boundaries of
large regional structures confirmed to contain commercial reserves of oil and natural gas.

Directors

Directors of the Company

EBITDA

Earnings before interest (finance costs), tax, D D & A (depletion, depreciation and amortisation) and
exploration expenses

EPSP

Environmental and Production Safety Programme

Executive Directors

The executive directors of the Company

Exillon Energy

Exillon Energy plc and its subsidiaries, referred to as the "Group"

Exillon Energy plc

A company incorporated in the Isle of Man, referred to as the "Company"

GOST standards

Technical standards originally developed for use in the Soviet Union and now maintained by the Euro-
Asian Council for Standardisation, Metrology and Certification, a regional standards organisation operating
under the auspice of the Commonwealth of Independent States).

HSE

Health, Safety and Environment

Miller and Lents

Independent reserves auditors

MMbbl

Millions of barrels

Non-executive Directors

The non-executive directors of the Company

Ordinary Shares

The Company has one class of share capital that is divided into 125,520,829 ordinary shares of US$0.0000125 each

Possible reserves

Those reserves of oil and/or gas that are not yet proven but which, on the available evidence and taking
into account technical and economic factors, have a better than 10% chance of being produced

Probable reserves

Those reserves of oil and/or gas that are not yet proven but which, on the available evidence and taking
into account technical and economic factors, have a better than 50% chance of being produced

Proved reserves

Those reserves of oil and/or gas that on the available evidence and taking into account technical and
economic factors have a better than 90% chance of being produced

RUR

Russian Rouble

km sq

Square Kilometre

UAE

United Arab Emirates

$

United States Dollar