凯基亚阶段性评估与发展战略

Scott C Hyder, John Baird
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引用次数: 0

摘要

Kaikias是在大火星/大熊地区的墨西哥湾深水区发现的四个叠置中新世油藏。在勘探过程中,只钻透了最低储层目标(Lambda),发现了油层至基底。随后又钻了一口评价井,穿透了上部三个储层目标(Beta、Zeta和Kappa),发现了所有储层的油层到底,并穿透了下部储层目标(Lambda),再次发现了油层到底。在勘探和评价项目之后,由于在任何储层中都缺乏确定的油水接触面,并且地震成像较差(影响了确定储层范围和厚度的能力),仍然存在相当大的资源不确定性。与其继续通过进一步的勘探和评估活动来降低油田的风险(可能会侵蚀生命周期价值并推迟首次产油),不如成熟一个小型、稳健的第一阶段项目,以加速首次产油,并通过生产数据降低地下风险。由于重复使用了两个现有的勘探和评估井眼,并且海底范围很小,因此第一阶段项目的竞争非常激烈。第一阶段项目于2017年1月获得壳牌(80%)和MOEX NA(20%)的批准。在第一阶段的执行过程中,提出了第二阶段的项目,以进一步评估第一阶段开发的三个储层(Beta, Kappa和Lambda),以及从第四个储层(Zeta)生产独特的产量。第二阶段的评估项目取得了巨大的成功,证明了所有三个第一阶段油藏的增产潜力,并证明了两个最低油藏(Kappa和Lambda)的扩张是合理的。在成功进行了第二阶段的评估和随后的Zeta油藏侧轨之后,提出了第三阶段的项目,在两个最低的油藏中分别增加第二口生产井,以加速并捕获每个油藏的独特产量。第三阶段项目还为该地区的进一步勘探提供了校准地震成像的机会,并提供了对流体梯度的更好理解。这种分阶段评估和开发方法为壳牌(80%)和MOEX NA(20%)带来了极具竞争力的投资,并允许共同所有者在不超支勘探和评估活动的情况下优化项目的生命周期价值。此外,分阶段评估和开发方法降低了项目的整体下行风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Kaikias Phased Appraisal and Development Strategy
Kaikias is an oil discovery of four stacked miocene reservoirs in the Deepwater Gulf of Mexico in the Greater Mars/Ursa Area. During exploration, only the lowest reservoir objective (Lambda) was penetrated, discovering oil pay to base. A follow-up appraisal well was drilled penetrating the upper three reservoir objectives (Beta, Zeta, and Kappa) discovering oil pay to base in all reservoirs, as well as penetrating the lowest reservoir objective (Lambda) and again discovering oil pay to base. Following the exploration and appraisal program, there remained considerable resource uncertainty given the lack of definitive oil water contacts in any of the reservoirs and poor seismic imaging (impacting the ability to determine the reservoir extent and thickness). Rather than continue to de-risk the field with further exploration and appraisal activities (potentially eroding lifecycle value and delaying first oil), a small, robust Phase 1 project was matured to accelerate first oil and to de-risk the subsurface through production data. The Phase 1 project was highly competitive attributable to the re-use of two existing exploration and appraisal wellbores and a minimal subsea scope. The Phase 1 project was sanctioned by Shell (80%) and MOEX NA (20%) in January 2017. During execution of Phase 1, a Phase 2 project was proposed to further appraise the three reservoirs developed by Phase 1 (Beta, Kappa, and Lambda) as well as to produce unique volumes from the fourth reservoir (Zeta). The Phase 2 appraisal program was a great success, proving upside in all three Phase 1 reservoirs and justifying expansion of the two lowest reservoirs (Kappa and Lambda). Following the successful Phase 2 appraisal and subsequent side track to the Zeta reservoir, a Phase 3 project was proposed to add a second production well to each of the two lowest reservoirs, accelerating and capturing unique volumes from each. The Phase 3 project also provided an opportunity to calibrate seismic imaging for further exploration in the area and to provide a better understanding of fluid gradients. This phased appraisal and development approach resulted in a highly a competitive investment for Shell (80%) and MOEX NA (20%) and allowed co-owners to optimize the lifecycle value of the project without overspending on exploration and appraisal activities. Further, the phased appraisal and development approach reduced the overall downside risk for the project.
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