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  • 河北十一选5开奖结果:SynAcq

    Planned Seismic Interference Mitigation

    后一万能码 2期内中 www.qgqx.net Recent advances in processing algorithms and new cooperative management techniques developed in conjunction with Statoil and Reservoir Imaging Ltd. (RIL), have effectively eliminated downtime or time sharing due to seismic interference (SI). This not only enables us to acquire data while other contractors are acquiring in the same area, but also allows us to deploy two (or more) vessels on a survey if data needs to be acquired quickly. This synchronized acquisition enables a 100% increase in productivity without compromising quality so that deadlines can be met and asset teams have more time to evaluate the data.

    SynAcq SI shotsIn this case there was near continuous SI from two vessels, one at 40km and one at 60km. All were shot with an 18,75m shot point interval


    SynAcq cone
    Cones around an acquiring vessel where SI
    might be problematic

    Ideally we need to avoid SI that is both broadside and arrives at the same time from shot to shot, however new subsurface imaging techniques enable even shot-to-shot coherent broadside noise to be attenuated. It has been shown (Dhelie et al, 2013Laurain et al, 2013; Elboth et al, 2015) that controlling the moveout of SI and the randomness of the arrival time on consecutive seismic records is significantly more important for its attenuation than the amplitude of the SI noise.

    By analyzing SI-contaminated data a series of noise thresholds have been established for zones of acceptable SI and zones where attenuation methods need to be tested (Laurain et al, 2014 and 2016). These describe a cone around the acquiring vessel, perpendicular to the sail line direction where SI might be problematic. Vessel speeds are actively adjusted to avoid vessels from entering any noise cone and also to ensure sufficient time differences in the arrival of SI on shot gathers.

    The lateral extension is based on the assumption that SI ceases to be a problem at distances greater than ~100km, although this assumption can be updated depending on water depths and sea bottom characteristics. In general, only the interference from the direct arrival propagating through the water is used for the purpose of planning acquisition cooperation schedules, as this is easy and quick to compute.

    Avoiding Time-Sharing

    By using an independent third party to coordinate all the acquisition in the Norwegian Sea to avoid shot-to-shot coherent (and where possible broadside) SI, significant improvements in acquisition efficiency were achieved during the 2015 and 2016 acquisition seasons. The cost of the coordination is that some vessels have to slow down during acquisition of some lines. However, the cost of these speed adjustments is typically less than 2%, compared with an average 12% loss for standby when time-sharing. Combining this with the flexibility of being able to operate as close as 8 km apart enables overall operational efficiency to be considerably increased.

    Year Min vessel  separation Max SI noise level Lost time due to SI Cross Party Coordination No. of Participants
    ≥ 2014 ~40km 20μBar 12% No  
    2014 ~40km 40μBar 10% No  
    2015 ~25km No limit 3% Yes 7 (inc 3 x CGG)
    2016 ~8km No limit 1% Yes 6 (inc 2 x CGG)

    Advances in seismic interference noise attenu...

    Thomas Elboth (CGG) | Honglei Shen (CGG) | Jamshade Khan (CGG)
    ?2017 EAGE

    New Seismic Interference Mitigation Technique...

    Jo Firth
    ?2017 Palladian Publications Ltd

    Coordination marine acquisitions to tackle se...

    Thomas Elboth
    ?2017 EAGE
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  • 太坏了!傅欢遇“断子绝孙腿” 这动作红牌都不冤 2019-04-17
  • 市民工地发现并机智"抢回" 4件圆明园流散文物终"回家" 2019-04-17
  • 世界杯成中国企业营销升级大战场 2019-04-15
  • 中东部地区将有强降雨 京津冀等地有轻至中度霾 2019-04-11
  • 郑永年:新时代的清醒判断 2019-04-11
  • 让协商民主优势得以充分发挥 2019-04-10
  • 网友给太原市市长留言获回复 共计11条 2019-04-09
  • 尧都区车站街建设社区老党员高德宏同志手抄“党章”庆党生 2019-04-09
  • 正心正念 爱国爱教 佛界楷模 2019-04-02
  • 防治土地荒漠化 新疆保护生态兼顾农民增收 2019-04-02
  • 许倬云作序《现代的历程》:现代人的天问 2019-03-31
  • 证监会:首发审核政策始终没有变化 2019-03-31
  • 2008年全球金融危机之后,为什么金融危机发源地的美国,欧债危机重灾区的欧洲各国股市连续7年走牛,屡创历史新高,唯经济最好的中国股市却连续7年熊冠全球?去年中国 2018-11-17
  • 完成自己的第一部电影, 她23岁就做到了 2018-11-17