Development of Phased Array Ground Penetrating Radar for near surface exploration

M. Vatshelle, M. Glegola, M. Lien, T. Noble, H. Ruiz
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引用次数: 5

Abstract

The primary development drilling at the Ormen Lange field at the Norwegian continental shelf concluded in 2014. Reservoir monitoring is employed to reduce subsurface uncertainties and assist with late field-life development decisions. Geophysical methods used include 4D seismic, seafloor geodesy and field-wide 4D gravity and subsidence surveys. This abstract presents the results on both seafloor subsidence and 4D gravity from the surveys performed in 2012 and 2014. These results are provided at a lower cost and significantly faster turnaround compared to 4D seismic. While 4D seismic does not provide sufficient sensitivity to seafloor subsidence at Ormen Lange because of oceanographic variations, 4D gravity and subsidence surveys provide a clear picture, that is key for understanding and monitoring reservoir compaction. 4D gravity results, in turn, provide a valuable input to understanding mass changes in the reservoir. This input has less lateral resolution than that from 4D seismic, but as gravity is sensitive to mass changes, it provides immediate insight into the energy balance of the field and can be quickly integrated into history matching workflows. The integration of gravity and time-lapse seismic provides a reduction of uncertainties on aquifer influx and strength, with increased confidence through the consistency of independent methods.
近地表探测相控阵探地雷达的研制
挪威大陆架Ormen Lange油田的初步开发钻探于2014年结束。储层监测用于减少地下不确定性,并协助后期油田开发决策。使用的地球物理方法包括四维地震、海底大地测量和全油田四维重力和沉降测量。本文介绍了2012年和2014年进行的海底沉降和4D重力调查的结果。与四维地震相比,这些结果的成本更低,周转速度更快。由于海洋变化,4D地震对Ormen Lange的海底沉降没有足够的敏感性,而4D重力和沉降测量提供了清晰的图像,这是了解和监测储层压实的关键。反过来,4D重力结果为了解储层的质量变化提供了有价值的输入。这种输入的横向分辨率低于四维地震,但由于重力对质量变化很敏感,因此可以立即了解油田的能量平衡,并可以快速集成到历史匹配工作流程中。重力和时移地震的整合减少了含水层流入和强度的不确定性,通过独立方法的一致性增加了可信度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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