Investigation of Brine Migration in the Louisiana Gulf Coast

我们将把11129 I系统应用于起源研究， 路易斯安那州墨西哥湾沿岸盆地盐水的迁移历史。这 一个盆地由一系列沉积层组成， 从侏罗纪到近代 一般来说，有三种不同的 在这个盆地，一个浅淡水系统，和两个流动制度 更深的系统，一个是液压系统，一个是高压系统， 其特征是具有较高浓度溶质的流体。 虽然沉积层的沉积序列 在这个盆地是很好地理解，盐水的关系， 它们的寄主结构常常不清楚。 地球化学 碘结合129 I半衰期的特征 (15.7 Ma）使这种同位素系统对 地球化学中流体和有机质来源年龄的测定 这个盆地，并结合测定36氯，为 沃茨在各自宿主中停留时间的估计 形成。 这项研究的结果将提供有关 流体与其寄主岩石之间的年龄关系， 盆地不同部分的流体之间的关系， 不同水库之间的交通。 因为存在 碘的含量与有机物的含量有关， 给出了关于起源和年龄关系的信息， 这个盆地的碳氢化合物。 由于该项目代表了 这是该同位素系统首次用于区域 在沉积盆地的规模，这项研究还将表明， 129 I系统在流体研究中有一定的应用价值 在含有有机物质的盆地中运动。 这非常 对理解盆地演化、石油 沉积成矿作用的形成。//

We will apply the 11129 I system to the study of the origin and migration history of brines in the Louisiana Gulf Coast Basin. This basin consists of a sequence of sedimentary layers ranging in age from Jurassic to recent. Generally, there exist three different flow regimes in this basin, a shallow fresh-water system, and two deeper systems, one hydropressured, one geopressured, which are characterized by fluids with higher concentrations of solutes. Although the depositional sequence of the sedimentary formations in this basin is well undeerstood, the relation of the brines to their host formations is often not clear. The geochemical characteristics of iodine combined with the half-life of 129 I (15.7 Ma) make this isotope system potentially useful for the determination of source ages for fluids and orgainic material in this basin and, in conjunction with determination of 36 Cl, for the estimate of residence times of waters in their respective host formaiton. The results of this study will give information on the age relation between the fluids and their host rocks, on the relation between fluids in the different parts of the basin and on communication between different reservoirs. Because the presence of iodine is related to that of organic material the result will given information on the origin and the age relation of hydrocarbons in this basin. Since this project represents the first time that this isotope system is to be used on a regional scale in a sedimentary basin, the study will also indicate to what extent the 129 I system is useful for the investigation of fluid movement in basins containing organic material. This has very strong implication for understanding basin evolution, oil accomulation and formation of sedimentary ores.//