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首页> 外文会议>Convention of the Gulf Coast Association of Geological Societies American Association of Petroleum Geologists Sectional Meeting >Geologic Model of Quaternary and Tertiary Deltaic Stratigraphy and the Impacts on Saltwater Encroachment in the Greater New Orleans Area
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Geologic Model of Quaternary and Tertiary Deltaic Stratigraphy and the Impacts on Saltwater Encroachment in the Greater New Orleans Area

机译：第三节和三角洲地层地质模型及盐水侵蚀大新奥尔良地区的影响

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A major environmental and economic problem currently faces the New Orleans area in southeastern Louisiana, stemming from salinization of freshwater aquifers that are important resources for the community. Major pumping of these aquifers has altered the potentiometric flow, allowing saltier bodies of water to flow into the region. The impact of pumping wells on encroachment of saltwater and the time as well as the route for saltwater to travel from the current saltwater-freshwater interface to pumping centers is not well constrained. Water planners need additional information to make decisions about future management of groundwater resources. The most effective way to analyze pumping effects on groundwater is to build a computer simulated flow model. However, such a model is reliable only if the permeability pathways and structures through which the water moves are well understood, which necessitates a clear picture of the subsurface geology. The lithology and structure of the New Orleans subsurface is controlled by the fluvial/deltaic environment that has characterized southeastern Louisiana during the Pleistocene and Holocene periods. The Mississippi River and associated deltas have migrated throughout southern Louisiana over geologic time. The river channels and deltaic lobes that migrate back and forth likely do not return to the exact same spatial coordinates upon return to southeastern Louisiana, creating complications in defining stratigraphic features. Therefore, a geologic model was produced using well log correlation to characterize both lateral continuity and thickness of lithologic units. The geologic model and associated cross sections highlight proposed locations of geologic units, including deltaic lobes, only when the units are clearly indicated in geophysical logs. Results reveal a highly heterogeneous subsurface, where units are discontinuous at scales of 1000 ft (300 m), highlighting the significant lack of available geophysical logs to create a perfectly accurate geologic model. Therefore, many plausible realizations of the subsurface are plausible, and the style of lithologic correlation can create large differences in the numerical modeling of saltwater encroachment, creating a need to explore new stochastic methods of correlation in complex environments such as the New Orleans area.
机译：一个重大的环境和经济问题，目前面临在路易斯安那州东南部的新奥尔良地区，淡水含水层是社区的重要资源，盐碱化而产生。这些含水层的主要抽水已经改变了电位流动，使水的咸机构流入该地区。抽油机井盐水的侵占和时间的影响，以及对海水抽中心路线行进，从目前的海水，淡水界面没有很好的约束。水资源规划者需要更多的信息来对地下水资源的未来管理决策。分析地下水抽水效应的最有效的方法是建立一个计算机模拟流模型。然而，这样的模型是可靠只有在渗透通道和结构，通过该水的动作是公知的，这需要地下地质的清晰图像。新奥尔良地下的岩性和结构由河流/三角洲环境中更新世和全新世周期已经表征路易斯安那东南部控制。密西西比河和相关三角洲在整个南部路易斯安那州在地质时间的迁移。河道和三角洲叶能迁移前后可能不会在回到路易斯安那州东南部返回完全相同的空间坐标，创建定义地层特征的并发症。因此，使用测井相关来表征两个横向连续性和岩性单元的厚度，制作地质模型。地质模型和相关的横截面突出地质单元的建议地点，包括三角洲叶，只有当单位地球物理测井都清楚地标明。结果揭示高度异质地下，其中单元是不连续的，在1000英尺（300米）的尺度，突出显著缺乏可用的地球物理日志创建一个完全精确的地质模型。因此，地下的许多似是而非的实现是合理的，与岩性相关性的风格，可以创建在海水侵蚀的数值模拟较大的差异，创造一个需要探索在复杂的环境中，如新奥尔良地区相关的新的随机方法。

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