Generation of Overpressures, Fluid Migration, Mass Transport and Diagenesis Associated with Deformation and Dissolution of Allochthonous Salt Sheets in the Deep Water Gulf of Mx..

与墨西哥深水湾异地盐层变形和溶解相关的超压、流体运移、传质和成岩作用的产生。

• 批准号: 9805459
• 负责人: Jeffrey Nunn
• 金额: $ 20万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-01 至 2004-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9805459&HistoricalAwards=false
• 关键词: Generation; Overpressures; Fluid; Migration; Mass

9805459NunnLarge-scale vertical and lateral migration of salt bodies in the Gulf of Mexico sedimentary basin has played an important role in the stratigraphic, structural, and hydrogeologic evolution of this portion of the earth's crust. We propose to extend our previous work in older onshore sediments out into the deep water Gulf, where active salt deformation, fluid flow, and heat and solute transport makes it an ideal area to test hypotheses regarding coupling between fluid flow, mass transfer, diagenesis, and tectonic processes.We will carry out a three-year study of fluid flow and chemical reaction on the tens of kilometer minibasin scale. Numerical modeling will be used to investigate the generation of overpressure and compaction-driven flow, coupled density-driven and compaction driven flow, over pressuring and episodic fluid flow within ductile shearing zones, and physical controls on salt dissolution and pore water salinity on the minibasin scale. Integrated into this work will be field-documented spatial variations in formation water and sediment properties derived from wireline logs and calculations of sediment-fluid diagenetic reactions in systems of widely varying salinity.While our studies will be focused on the Gulf Basin, the results will be broadly applicable to any sedimentary basin containing salt. Study of this currently active basin will provide important clues to the evolution of basins now tectonically inactive or which have been largely destroyed through major tectonic processes.

墨西哥湾沉积盆地盐体的大规模垂向和侧向迁移对这部分地壳的地层、构造和水文地质演化起着重要作用。 我们建议将我们以前在较老的陆上沉积物中的工作扩展到深水海湾，那里活跃的盐变形，流体流动，热量和溶质运移使其成为一个理想的区域，以测试流体流动，质量传递，成岩作用和构造过程之间的耦合假设。我们将在数十公里的小盆地尺度上进行为期三年的流体流动和化学反应研究。 数值模拟将被用来研究超压的产生和沉积驱动的流动，耦合的密度驱动和压实驱动的流动，超压和幕式流体流动的韧性剪切带内，和物理控制盐溶解和孔隙水盐度的小盆地规模。 这项工作将纳入现场记录的地层水空间变化和沉积物性质，这些变化来自电缆测井和对盐度变化很大的系统中沉积物-流体成岩反应的计算。虽然我们的研究将集中在海湾盆地，但结果将广泛适用于任何含盐沉积盆地。 对这一现今活动盆地的研究将为现今构造活动不活跃或在主要构造过程中大部分被破坏的盆地的演化提供重要线索。