2018 Offshore Technology Yearbook

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Page 28 of 55 | December 2017 | 27 EXPLORATION | 2018 OFFSHORE TECHNOLOGY YEARBOOK existing infrastructures. According to Eni, the well has the capacity to deliver more than 7,000 boe/d. BP continued exploration offshore Egypt, discovering gas with the Qattameya Shallow-1 exploration well in the North Damietta Conces- sion of the East Nile Delta in March. Qattameya marks the supermajor's third dis- covery in the block. Africa drilling opens frontiers Senegal was the most productive exploration area in Africa in 2017. In May, Cairn Energy found oil with the ultradeepwater FAN South-1 well 55 miles offshore in the Sangomar Deep Offshore Block. The operator found hydrocarbons in its first pure exploration well offshore Senegal since the dis- covery wells of FAN-1 and SNE-1 in 2014. Three months later, Cairn hit again with the SNE North-1 well on the same block. BP and Kosmos Energy also had deepwater success offshore Senegal with the Yakaar-1 explo- ration well in the Cayar Offshore Profond block approximately 60 miles offshore. The well inter- sected a gross hydrocarbon column of 394 ft in three pools within the primary Lower Cenomanian objective encountering 148 ft of net pay. Kosmos estimates Yakaar-1 discovered a gross gas resource of about 15 Tcf. This well is the first in a four-well series of independent tests of the basin floor fan fairways, outboard of the proven slope channel trend opened with the Tortue-1 discovery. Kosmos has drilled six consecutive successful exploration and appraisal wells in this fairway with a 100% success rate. In February, Noble Energy Inc. discovered oil in the shallow-water Carmen prospect on Block O offshore Equatorial Guinea, encountering approx- imately 26 ft of net oil pay and 13 ft of net gas pay. Carmen is Noble's first oil discovery on the block. New plays offshore Russia Russia's Rosneft had success mid-year with the northernmost exploratory well on the Eastern Arctic Shelf in the Laptev Sea. The shallow-water Tsentralno-Olginskaya-1 well was drilled from the shore of the Khara-Tumus Peninsula on the shelf of Khatanga Bay. Studies of Rosneft's acreage in the Laptev Sea since 2014 have identified 114 promis- ing oil- and gas-bearing structures. More good news followed in early October with Gazpromneft's giant oil discovery on the Ayashski Block offshore Sakhalin Island in Russia's Far East. Initial in-place reserves are estimated at 1.86 Bboe, making the Ayashskoye Field the biggest discovery in Russia and one of the largest in the world in 2017. Exploratory drilling continues in India, Asia India's Oil and Natural Gas Corp. Ltd. reported three offshore discoveries during the first quarter of its fiscal year, including the SW-WO-24 well in the shallow-water Mumbai basin. Three zones were tested and flowed gas and condensate. The GD-10-1 well tested two zones in the Krishna- Godavari (KG) basin, drilling the Godavari Clay Formation to identify a new prospect. The GS-29 No. 11, also in the KG Basin, was classified as a new pool discovery as well. While India delineated known plays, Woodside focused on drilling underexplored acreage offshore Myanmar. In August, the operator announced that its Pyi Thit-1 exploration well in Block A-6 in the Southern Rakhine Basin intersected a gross gas column of approximately 210 ft. The gas discov- ery at Pyi Thit-1 follows previous Woodside finds with the Shwe Yee Htun-1 well in Block A-6 and the Thalin-1A well in Block AD-7 early in 2016. Offshore Vietnam, Murphy Oil tested its acre- age on Block 11-2/11 in the Nam Con Son Basin, discovering oil with the CT-1X well. The second exploration well was delayed following this dis- covery, but Murphy has plans for continued exploration in the region. China steps up exploration drilling CNOOC had an active 2017, announcing early in the year plans to drill 126 exploration wells. While the NOC did not share the results of all its planned wells, it reported four new discoveries and five appraisal wells offshore China in the first quarter. Among them were the Bozhong 29-6 and Bozhong 29-6S wells drilled in the mature area of Bohai Bay. These wells were followed by Bozhong 29-6 South later in the year.

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