Lessons Learned From the World's Largest Continuous Onshore and Offshore 3D Seismic Survey

S. A. Al Mesaabi, G. Cambois, J. Cowell, D. Arnold, Mohamed Fawzi Boukhanfra, Saeed Hamad Al Karbi, M. Mahgoub, Khalid Obaid
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Abstract

In 2017 ADNOC decided to cover the entire Abu Dhabi Emirate, onshore and offshore, with high- resolution and high-fold 3D seismic. Acquisition of the world's largest continuous seismic survey started in late 2018 and is around 77% complete at the time of writing. Data processing is well under way and interpretation of the first delivered 3D cubes is ongoing. Now is an opportune time to review the status of this gigantic project and draw preliminary lessons. Comparison with legacy data shows a massive improvement in deep imaging, which was one of the main objectives of this survey. The basement can clearly be interpreted, while it is hardly visible on legacy data being covered with high energy multiples. A thorough analysis demonstrated that increased offset is the main reason for the uplift. The large fold and the low frequency sweep also help recover signal down to 3 Hz. This extends the bandwidth in the low frequencies by one to two octaves compared to legacy data, which tremendously benefits structural interpretation and stratigraphic inversion.
世界上最大的陆上和海上连续三维地震调查的经验教训
2017年,ADNOC决定通过高分辨率和高倍数3D地震覆盖整个阿布扎比酋长国的陆上和海上。世界上最大的连续地震调查于2018年底开始,截至撰写本文时已完成约77%。数据处理正在顺利进行,第一批交付的3D立方体的解释正在进行中。现在正是审查这一庞大工程的现状并吸取初步教训的好时机。与传统数据的比较表明,深度成像技术有了巨大的进步,这也是本次调查的主要目标之一。基底可以清楚地解释,而在被高能量倍数覆盖的遗留数据上几乎看不到。深入分析表明,偏移量的增加是隆升的主要原因。大折叠和低频扫描也有助于恢复信号下降到3hz。与传统数据相比,这将低频带宽延长了一到两个八度,极大地有利于构造解释和地层反演。
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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