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Addax Petroleum was established in 1994 and since August 2009 has been a subsidiary of the Sinopec Group, one of the largest oil and gas producers in China, the biggest oil refiner in Asia and the third largest worldwide. Addax Petroleum was an international gas and oil production and exploration company mainly focused on the Middle East, the North Sea and Africa. Since 1994, the company become one of the largest oil producers in West Africa.
Addax Petroleum was originally part of the Addax & Oryx Group of Companies (AOG) which was founded in 1987. In 1989 AOG embarked on an ambitious expansion programme with the aim of becoming a vertically integrated oil company focused on the African continent. This led to the creation of Addax Petroleum in 1994 by Marc Lorenceau, a partner from the AOG trading group. Addax's initial steps in the upstream business was the acquisition of the Espoir field offshore Ivory Coast that had been relinquished by Phillips in 1988. Four years later, Addax Petroleum sold its remaining equity in the Espoir field to CNR (Canadian Natural Resources). In 1998, as oil prices were dropping, Ashland Oil Nigeria was for sale as the company wanted to leave the country's upstream sector. Perenco appeared to be the best bidder for Ashland's assets. However, the bidding process was overturned and these assets were eventually awarded to Addax Petroleum for the official amount of twenty million US dollars. After the tragic death of Mr. Lorenceau in a ski accident in late 2001, Jean Claude Gandur became the company's Chairman and CEO until the takeover by the Sinopec Group in August 2009. At Sinopec's take over, Mr. Geng Xianglang was appointed CEO, followed by Mr. Zhang Yi in 2010. Mr. Geng Xianglang remains as Chairman of the board
- 1994: Addax Petroleum founded. PSC for Espoir field in Ivory Coast
- 1998: Acquisition of Ashland Nigeria assets. Company average production of 8,800 bopd
- 1999: First drilling campaign in OML 123, offshore Nigeria
- 2000: OML 123 Ebuguu Northeast discovery, offshore Nigeria
- 2001: OML 123 Adanga South discovery, offshore Nigeria. Death of founder Marc Lorenceau.
- 2002: Company average production of 40,000 bopd. Ngosso Concession Agreement signed, offshore Cameroon
- 2003: OML 123 Oron West & North discoveries, offshore Nigeria. OML 124 drilling campaign, onshore Nigeria
- 2005: Company average production of 75,000 bopd. First Oil in OPL90 (OML 126) Okwori field, offshore Nigeria. 3 PSCs signed in the Nigeria/São Tomé & Principe Joint Development Zone (JDZ). Farm-in Agreement signed on Taq Taq field, Kurdistan Region of Iraq (KRI)
- 2006: Listing on the Toronto Stock Exchange (TSX). Acquisition of Pan Ocean Energy's assets, onshore and offshore Gabon
- 2007: Company average production of 126,000 bopd. Addax Petroleum Foundation established. Listing on the London Stock Exchange (LSE)
- 2008: PSC on Iroko licence signed, offshore Cameroon
- 2009: Acquisition of Addax Petroleum by the Sinopec Group. First exports of crude from Taq Taq field, Iraqi Kurdistan
- 2011: Company average production of 140,000 bopd. Acquisition of Royal Dutch Shell's upstream assets, offshore Cameroon. Sinopec-Addax Petroleum Foundation established
- 2012: Creation of Talisman-Sinopec Energy UK Ltd joint venture company. Acquisition of Total S.A.'s interest in OML 138, deep-offshore Nigeria. Opening of Houston office, United States
- 2013: Addax Petroleum promotes its corporate values, the first of it is "Integrity through Action". 
- 2014: OML-138 Total S.A.'s interest acquisition, fails to receive Nigerian's authorities approval.
- 2015: Hit by the collapsing crude oil price and the lack of operational and exploration results, Addax Petroleum releases 70 people at its Geneva offices.
- 2016: Blaming Talisman and Repsol for their poor acquisition of the UK assets, Addax Petroleum seeks a US$5.5 bn arbitration against Talisman and Repsol 
- 2016: Addax Petroleum long time external auditor, Deloitte, refuses to certify the company UK branch (APUK)'s balance sheet on suspicious payments from Geneva, the Isle of Man, and in Nigeria.
- 2017: Addax Petroleum's Chief Legal and Chief Executive Officers are arrested in Geneva on corruption of foreign officials charges. Eventually, Addax Petroleum agreed early July to pay 31 million Swiss francs to settle the charges with the Geneva justice department. In August, Addax Petroleum announced the shutting of its offices in Geneva, Houston and Aberdeen, thus releasing 174 people . The closure of these offices is expected to be completed on December 10 and fully effective on December 31st, 2017.
Addax Petroleum hydrocarbon production
The Company's average daily oil production for 2011 was 140,000 bbl/d. Year-to-date average daily oil production as of Q3 2012 was 167,000 bbl/d (this figure does not take the Talisman-Sinopec Energy UK nor the OML 138 production figures into account).
As part of its "Vision 500", Addax Petroleum was aiming at reaching an average daily production of 500,000 barrels of oil by 2015. Addax Petroleum has never been able to get anywhere close to that production figure.
The TTOPCO Joint Venture company (together with Genel Energy) was the largest oil producer in Iraqi Kurdistan. In 2017 TTOPCO announced a $181-million writedown on the asset value  after the auditor McDaniel in February 2017 had evaluated its reserves at 59 MMbbls, compared to 172 MMbbls at 31 December 2015. Addax Petroleum purchased 49% of Talisman UK in 2012 to form the Talisman-Sinopec Energy UK Ltd Joint Venture company, that became Repsol-Sinopec Resources UK  in July 2016 and is the 4th largest UK oil producer. The Talisman UK production, that averaged 69,000 bopd in 2012, continued its decline to be around 52,000 bopd in 2017.
Addax Petroleum has a dominantly onshore and offshore brown producing-fields asset base located in Nigeria, Gabon, Cameroon and the Kurdistan Region of Iraq, as well as the UK North Sea's Continental Shelf.
Addax Petroleum's motto states, "Each step makes a difference and difference is our strength". The company motto reflects the fact that Addax Petroleum puts strong emphasis on cross-cultural management, as the company brings together employees from many different cultural backgrounds under Chinese management.
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- "Addax to pay 31 million Swiss francs to settle Swiss bribery charges".
- "Chinese-owned oil firm Addax shuts offices after Swiss bribery case".
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- "Repsol Sinopec Resources UK website". repsolsinopecuk.com/. Retrieved 2017-09-25.