Integration of Seismic and InSAR data for CO2 Sequestration Study at InSalah Project

  • 邓春林
  • 创建于 2017-06-26

报告人:张锐 (Rui Zhang)

报告时间:75日(周三)14:00-17:00         

报告地点:计算地球动力学重点实验室会议室

报告人简介:张锐博士于2010在休斯顿大学获得地球物理博士学位,之后分别在德州大学奥斯丁分校和劳伦斯伯克利国家实验室从事博士后研究。从2014年之后,张锐博士在路易斯安那大学拉法叶分校开始担任助理教授。张锐博士主要从事勘探地球物理领域的研究,主要研究方向包括地震数据反演和成像,四维地震等技术在油藏,地热以及二氧化碳封存等领域的应用。

报告简介: The In Salah carbon dioxide storage project in Algeria has injected over 3 million tonnes of carbon dioxide into a water-filled tight-sand formation. During injection interferometric Synthetic Aperture Radar (InSAR) revealed a doubled lobed pattern of surface uplift up to 20mm above a horizontal leg of an injection well. Our analysis indicates this surface uplift is associated with this well and comes from the injection of CO2. The depression between the two lobes is caused by an opening of a sub-vertical fracture or damage zone at depth above the injection interval, which allowed injected CO2 to migrate upward. Interpretation of 3D seismic data reveals the presence of a subtle linear push-down feature located along the InSAR determined surface depression between the two lobes, which we interpret to have been caused by the anomalously lower velocity of the fracture zone caused by the presence of CO2 displacing brine in this feature. To enhance the seismic interpretation, we calculated many seismic attributes, including positive and negative curvatures, from the post-stack 3D reflection seismic data. The maximum positive curvature attribute shows the clearest linear features, with two parallel trends, which agrees well with ant-tracking volumes and the InSAR observations of the depression zone. The seismic attributes provide a plausible characterization of the fracture zone extent, including height, width and length, which provide important information for further study of fracture behavior due to the CO2 injection.