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Improved Imaging with Long Offset Data
A 4x4 km grid with long offset data in the Norwegian Sea helps getting a better understanding of the regional development of the Vøring Basin.
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Extensive thick sequences of basalt dominate the northwest flank of the Faroe Shetland Basin. Recent reprocessing of this long offset data dramatically improves the interpretability of the sub-basalt structures.
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In support of the 10th Gabonese Licensing Round planned to be opened in May 2010, new seismic data, combined with an integrated study using potential field and geological data, has revealed significant pre-salt sediments in this complex basin. The pre-salt data resembles the geology observed around recent Brazilian pre-salt discoveries.
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Based on an entirely new data set, including reprocessed seismic and remote sensing data, an integrated geological study clearly demonstrates the presence of mature source rocks and a multitude of play models in the Ceduna Sub-basin off shore Southern Australia.
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For the 3rd year in a row, Fugro has acquired long offset 2D data in the Norwegian Barents Sea, thereby responding to a request from the petroleum industry for putting together a database that can help understand the complexity and the hydrocarbon potential of an underexplored geological province within the Arctic realm. The Norwegian Barents Sea Regional (NBR) multiclient data base now comprises more than 33,000 km, with more to follow in the next years.
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Just as in Deepwater Brazil (GeoExpro 2008, No. 4), a new frontier is opening in the deep offshore (>400m water depth) off the West Coast of India – not sub-salt in this case but sub-basalt – driven by advances in seismic acquisition and processing techniques. The pullout on these pages shows a sample Pre-Stack Depth Migration (PSDM) of a reprocessed 2D seismic line from a 2002 survey in this area.
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The sub-salt discoveries recently reported in the Santos basin, offshore Rio de Janeiro, Brazil could be the largest in over 30 years and has captured the world’s attention.
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In 2006, TGS-NOPEC Geophysical Company acquired 3600km of multi-client 2D seismic in the Russian Chukchi Sea in cooperation with Geophysical Solutions Integrator. The Chukchi Sea has an average water depth of 77m and comprises some 600,000 km2 when including the American part. The sea is navigable between July and October both eastward and westward from the shallow Bering Strait.
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Exploration interest in the deepwater US Gulf of Mexico is at an all time high with the deep water “Wilcox” sand play being the main reservoir target.
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For the second year in a row Fugro has acquired long offset 2D seismic data in the Norwegian sector of the Barents Sea (Norwegian Barents Sea Regional, NBR 2007). These regional lines create a grid that enables the explorationist to tie licensed blocks in mature areas with open blocks in frontier areas. These datasets also give room for creating new ideas about the geological evolution of the area in general and the exploration potential in particular.
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This example from the 2D North Sea Renaissance (NSR) seismic program is from the Norwegian Danish Basin. The middle part of the section is dominated by 2-4 km of heavily structured Triassic sediments and Permian salt. The parallel layers below the salt are assumed to represent the Rotliegendes Formation underlain by pre Permian sedimentary basins and highs.
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In 2004-2006 Fugro Multi Client Services acquired the first three phases (total 18,434 km) of a 2D programme, Mid-Norway Regional (MNR), aiming at covering the Mid-Norway continental shelf with long cable (10 km) and long recording (10 seconds two-way time) seismic data.
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With 12 recently announced deep-water discoveries and an aggressive leasing schedule for the Western and Central Gulf of Mexico, exploration and production technology is being pushed to its limits. To meet industryneeds to image deeper and more obscure targets, TGS-NOPEC Geophysical Company has over 2.5 million km of 2-D and 88,000 km2 of 3-D seismic data available in the Gulf, of which this line is an example.
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