Regional Migration of Hypersaline Brines in Sedimentary Basins

沉积盆地高盐卤水的区域运移

• 批准号: 9019342
• 负责人: Jeffrey Nunn
• 金额: $ 11.43万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-03-01 至 1994-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9019342&HistoricalAwards=false
• 关键词: Regional; Migration; Hypersaline; Brines; Sedimentary

The most widely accepted driving mechanisms for regional migration of pore fluids in sedimentary basins are sediment compaction and topography. Previous analyses indicate that both mechanisms have potential difficulties explaining some of the above geologic observations unless the fluid flow is spatially or temporally restricted. Specifically, heat content of pore fluids or flow rates or both are not sufficient for compaction driven flow to produce migration of warm pore fluids on a regional scale. Topographically-driven flow may produce warm pore fluids on a regional scale, but would result in depletion of saline components of fluids. We propose to carry out a two year study on the following aspects of regional migration of hypersaline brines: (1) develop suitable PTX equations of state for hypersaline brines under basinal conditions and examine the effects of salinity in controlling pore water flow in sedimentary basins; (2) examine various mechanism for focusing or concentrating flow of warm, saline brines, including: episodic expulsion of pore fluids, fluid flow along aquifers or faults, deflection or focusing of fluid flow by basement or surface structures and three-dimensional flow; and (3) apply these results to the regional migration of pore fluids in the Colville Basin, Alaska and the Northern Gulf Coast. The regional migration of hypersaline brines over hundreds of kilometers through sedimentary basins has been suggested as a mechanism to explain a number of important geologic observations. These include: remagnetizations found in Paleozoic carbonates of North America, clay mineral diagenesis, inclusions of high pressure, high temperature fluids, and distribution of oil, gas and Mississippi Valley-type lead-zinc deposits.

最广泛接受的区域发展驱动机制 沉积盆地中孔隙流体的迁移是沉积物 压实和地形。 此前的分析表明， 机制有潜在的困难解释一些 除非流体流动在空间上或 时间限制。 具体来说，孔隙流体的热含量 或流速或两者都不足以进行压实驱动 流动产生的热孔隙流体在区域上的迁移 规模 地形驱动的流动可能产生温暖的孔隙流体 在区域范围内，但会导致盐水耗尽 流体的成分。 我们建议进行一项为期两年的研究 关于高盐区域迁移的以下方面 盐水：（1）开发合适的PTX状态方程， 在盆地条件下的高盐卤水，并检查 盐度对沉积物孔隙水流动的控制作用 （2）研究各种聚焦机制， 集中流动的温暖，盐水，包括： 孔隙流体的排出，沿着含水层或断层的流体流动， 流体流动因基底或表面而发生的偏转或聚集 结构和三维流动;和（3）应用这些 科尔维尔地区孔隙流体区域运移的结果 盆地，阿拉斯加和北方墨西哥湾沿岸。 区域 高盐卤水迁移数百公里 已经被认为是一种机制， 解释了一些重要的地质观测结果。 这些 包括：在华北古生代碳酸盐岩中发现的重磁化作用 美国，粘土矿物成岩作用，高压包裹体 高温流体，以及石油、天然气和 密西西比河谷型铅锌矿床。