南米での近年の石油探鉱の動向について

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  • Recent petroleum exploration trend in South America
  • 講演 南米での近年の石油探鉱の動向について
  • コウエン ナンベイ デ ノ キンネン ノ セキユ タンコウ ノ ドウコウ ニ ツイテ

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<p>South America is one of the most promising exploration area, including exploration frontiers. As a result of recent exploration activities, remarkable discoveries were made especially in deep-water area including the presalt carbonate sections in the Santos Basin, offshore Brazil and the Upper Cretaceous turbidite sandstones offshore French Guiana.</p><p>The outstanding pre-salt discovery of the Tupi field in the Santos Basin in 2006 opened the pre-salt play and has been followed by similar giant discoveries. The main reservoir facies is known as bioclastic carbonates and microbialite developed right before evaporite deposition on the Outer High trend. The production from the pre-salt carbonates in Brazil runs up to 480,000 bbl/d as of June 2014. As the productivities varies by well, it is important to find better reservoir facies for commerciality.</p><p>Since the discovery of the Jubilee Field in June 2007 offshore Ghana, exploration has been focused on the stratigraphic play of Upper Cretaceous slope turbidites in the equatorial Atlantic Margins. In South America, the Zaedyus Field was discovered offshore French Guiana and Inpex found oil-bearing formations in Upper Cretaceous section in Block 31 offshore Suriname in 2011. It is thought that there is huge remaining exploration area for this type of play in the Atlantic Margins. Meanwhile commercial accumulations seem to be limited to only offshore Ghana at this point with remaining some challenges to find commercial size accumulations of stratigraphic traps.</p><p>Inpex has other exploration projects in the Espirito-Santo Basin, offshore Brazil and the Pelotas Basin, offshore Uruguay. We think that exploration potential of the Atlantic Margins in South America is attractive and worthy to maintain long-term E&P activities. In the meantime, it is crucial to address existing several issues including further improvement of seismic imaging, uncertainty of reservoir distribution of the pre-salt carbonates and difficulty in risk assessment of stratigraphic trap etc.</p>

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