Processing 3D Seismic Reflection Dataset From Offshore Costa Rica Through 3D Pre-Stack Depth Migration

通过 3D 叠前深度偏移处理来自哥斯达黎加近海的 3D 地震反射数据集

• 批准号: 1154635
• 负责人: Eli Silver
• 金额: $ 18.9万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-02-01 至 2013-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1154635&HistoricalAwards=false
• 关键词: Processing; 3D; Seismic; Reflection; Dataset

Intellectual Merit: The PI requests funds to help offset the costs of processing of recently acquired 3D seismic reflection data from the Costa Rica margin. These data were acquired as part of a project funded by NSF to image the subduction zone on the Pacific margin of Costa Rica, specifically targeting the subducting plate interface where regular subduction thrust earthquake occur. The original plan, outlined in the NSF-Costa Rica 3D proposal that was submitted in August, 2008, included 3D seismic data processing by the Spanish oil company Repsol. The agreement with Repsol included a letter of intent for Repsol to process these data at their expense. However, in the three intervening years since the agreement with Repsol and submission of the proposal (due to a year delay in funding and two-year delay in getting time on the R/V Langseth), Repsol entered into a partnership with CGGVeritas and subsequently changed their arrangements for processing all of their seismic data. Consequently Repsol was unable to offer data processing without some compensation to the Repsol/CGGVeritas partnership. Respol/CGGVeritas requires $150,000 to conduct this work, a fraction of the costs for doing the processing. With the funds requested in this proposal, Repsol/CGGVeritas will process the 3D data volume through an initial time-processing stage followed by a second stage of advanced 3D depth imaging. Repsol/CGGVeritas expects to complete both stages quickly, within ~12 months. The Costa Rica 3D seismic project was designed to image the subducting plate interface from the trench into the seismogenic zone. This is a subduction zone that regularly produces moderate M 7+ earthquakes. The primary goal of the project is to image the plate interface across the aseismic-to-seismic transition and to image the fault and deformational structures of the overriding plate with great detail and in 3D. The data acquisition on the Marcus Langseth was a success with the survey covering an 11 x 55 km area with 37.5 m inline and 25 m crossline spacing with nearly complete coverage. The total data volume is 4.5 Terabytes. Preliminary results from conducting quality control during the acquisition cruise shows the data are of high quality and will produce an excellent 3D volume. The PI has devised a plan for processing with Repsol/CGGVeritas and they are ready to begin the job. Repsol is satisfied these data will produce an excellent product once processed. Broader impacts: The project will enable the PI to maximize the quality of the images from these data and assume the greatest impact from this study. These data will be used by two MS students at the University of Texas and a postdoc at UC Santa Cruz. These students and the postdoc participated at sea with the data acquisition on the Langseth and will use the processed data for their thesis and postdoctoral studies. The processed 3D data volume will support planning and development of a major international program for drilling, the CRISP project, through the Integrated Ocean Drilling Program. The overall goals of the project, further understanding of the fault conditions within the seismogenic zone, will lead to a better understanding of the earthquake hazard in Costa Rica and will be directly applicable to subduction zone settings around the world.

知识分子优点：PI要求资金帮助抵消哥斯达黎加利润率最近获得的3D地震反射数据的处理成本。这些数据是作为由NSF资助的项目的一部分获取的，用于图像哥斯达黎加太平洋边缘的俯冲区，专门针对俯冲板界面，在这种俯冲板界面发生了常规俯冲推力地震。最初的计划是在2008年8月提交的NSF-Costa Rica 3D提案中概述的，其中包括西班牙石油公司Repsol的3D地震数据处理。与REPSOL的协议包括一封为Repsol的意向书，以他们的费用处理这些数据。但是，在与repsol达成协议和提交提案以来的三年中（由于资金延迟了一年的延迟和两年延迟在R/V langseth上的时间延迟），Repsol与CGGVeritas建立了合作伙伴关系，随后改变了他们处理所有地震数据的安排。因此，Repsol未能在Repsol/Cggveritas合作伙伴关系的情况下提供数据处理。 Respol/Cggveritas需要15万美元才能进行这项工作，这是进行处理的一小部分。在此提案中要求的资金后，Repsol/Cggveritas将通过初始时间处理阶段处理3D数据量，然后是高级3D深度成像的第二阶段。 Repsol/Cggveritas希望在约12个月内快速完成两个阶段。哥斯达黎加3D地震项目旨在成像从沟槽到地震区的俯冲板界面。这是一个定期产生中等M 7+地震的俯冲带。该项目的主要目的是对板上的板界面进行图像，并以3D和3D的形式对覆盖板的断层和变形结构进行映像。 马库斯·兰塞斯（Marcus Langseth）上的数据采集取得了成功，该调查涵盖了11 x 55公里的区域，内联37.5 m和25 m的横线间距几乎完全覆盖。 总数据量为4.5 trabytes。在采集巡游期间进行质量控制的初步结果表明，数据具有高质量，并且会产生出色的3D卷。 PI已经制定了与Repsol/Cggveritas处理的计划，他们准备开始这项工作。 REPSOL满足这些数据后将产生出色的产品。更广泛的影响：该项目将使PI从这些数据中最大化图像的质量，并采取本研究的最大影响。这些数据将由德克萨斯大学大学的两名MS学生和UC Santa Cruz的博士后使用。这些学生和博士后与兰塞斯（Langseth）的数据获取一起参加了海上，并将使用处理后的数据进行论文和博士后研究。处理后的3D数据量将通过集成的海洋钻探计划支持计划和制定，这是一项重大的国际钻井计划，即清晰的项目。该项目的总体目标，进一步理解地震生成区内的断层状况，将使人们对哥斯达黎加的地震危害有更好的了解，并将直接适用于世界各地的俯冲带。