... recording technique involving overlapping records (“mother records”). The dual-boat operation effectively doubles the streamer count, thus obtaining very long offset ranges. The mother records reduce cycle time and ensure an acceptable shot-point interval. The extra fold from long offsets roughly...

... (for near offsets) and dual-vessel (for mid and far offsets) was acquired at Holstein in August–September 2006. The second boat was ready for operation in dual-vessel mode from the start of the survey, and high repeatability would not have been achieved without the two-boat acquisition. Errors in shot...

.... The Enfield Field, in the North West Shelf of Australia, commenced oil production in July 2006. Woodside acquired a 4D monitor survey, Australia's first dedicated 4D survey, just seven months after production began. Woodside acquired the baseline seismic data in 2004 using a one-boat, dual source, 6 × 100...

... required to acquire the survey, thus reducing cost of in-field time. Analysis showed that subsalt diving waves emerge at offsets greater than 20 km in this region. This was beyond the maximum offset a dual-boat streamer configuration can reasonably capture. Moreover, the substantial velocity contrast...

... are sampled with a crossline bin size of 31.25 m rather than 15.625 m. The data acquired by the two source vessels are strictly speaking two separate but interleaved surveys. Therefore, crossline imaging is prone to migration-operator aliasing. On the other hand, the large fold of the acquired data...

... on the starboard side. The transducers swing down into operating position in the water and are held in position by means of steel cables. The transducers can also be mounted in the hull of the boat beneath the water line. Fig. 3. —Receiving transducer of Marine Sonoprobe mounted on M/V Falcon...

.... With a source point able to be recorded every 12 s, the survey could be recorded in 18 days plus another two days for turns given a two-source boat or a dual-gun boat operation and 15 minutes a turn. The deployment time of the receivers would also be factored at 48 receivers per day or 10 additional days...

... implementation of new ideas may have been due to the economically challenging market that equipment manufacturers and contractors operated in and the large capital cost associated with acquisition hardware. However, in the last few years, most players in the seismic industry have turned a healthy profit, which...

... had 2D SRME applied. Operationally, the survey was a success—a safe operation with minimal downtime despite rather unfavorable weather and currents. Source location repeatability was very good. The shot-oriented design allowed very efficient shot-oriented processing, with WEM based on the preexisting...

... for the raft. The use of dual constellation instruments guaranteed the positioning with a time interval of 0.5 s with a high level of accuracy. The real-time and postprocessing approaches were followed. The position of the boat was determined in real-time using the Regione Piemonte CORSs (Continuous...

... including drilling in active fault zones, inverse methods, remote reservoir resistivity mapping, the integration of geology and geophysics, monitoring fluid flow without a source, VSP, the history of exploration geophysics, and time-lapse seismic in difficult deepwater environments using dual-boat...

... deepwater technology solutions was operator commitment.” The author, Offshore Engineer 's U.S. editor Rick von Flatern, used dual gradient drilling (DGD) as a specific example. He wrote that “[DGD], on which the industry had spent more than $100 million by early 2002 in three separate JIP's, had yet...

... of the Norne FPSO used a two-boat operation (one conventional shooting boat and one Q-marine streamer boat). Again the acquisition geometry was repeated as accurately as possible, but good repetition in this area was much more difficult to achieve than in the main area covered by a one-boat operation. Figure...

.... The water depth in the area varies from approximately 1300 m above the Sigsbee escarpment to 2200 m below it. The survey used 902 four-component (4-C) ocean-bottom nodes, which BP commissioned Fairfield to build. The nodes were placed on the seafloor using a remotely operated vehicle. A dual...

... territory. These constraints create a short seismic season of only four months in this part of South Africa (from 1 January to 30 April with possible weather-dependent extensions into May). Anadarko South Africa Company, a subsidiary of Occidental Petroleum Corporation, was the operator of block 5/6/7...

... and identical responses for this reflector. The advantage of a nonuniform shot spacing, as indicated before, is to generate incoherent source timing without manipulating the boat speed. It minimizes the operational complexity for deploying dual source vessels in the field. In addition, we increased...

... to the more consolidated sediments. The nodes or AUVs may resurface on remote command to be retrieved for recycling. For the operation, one source vessel and only one node-handling (surface) vessel would suffice. Additionally, a flexible number of low-cost node-deployment/retrieval boats may be selected...

... in the North Sea and simultaneous operations with supply boats caused some delays, however the survey was completed safely and on schedule—within 15 days. All 154 nodes were retrieved upon completion of the program. Only one node failed to record data all the time for a satisfactory data recovery rate...

... subsurface uncertainty. This article is a case study of the progress made at the BP-operated Mad Dog Field. Copyright © 2007 Society of Exploration Geophysicists 2007 Corresponding author: [email protected] Deepwater subsalt discoveries along the Sigsbee Escarpment in the Gulf of Mexico...

... was acquired from April to August 2019, with a duration of 122 days. All nodes were recovered and had a failure rate of 0.4% (a total of 12 nodes). The survey had zero recordable incidents but was challenged with 108 close passes for three dual-source boats. The source density was set to 50 × 100 m...