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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;Meeting of the Gulf Coast Section of the Society of Economic Paleontologists and Mineralogists >Using Electric Logs to Estimate Groundwater Salinity and Map Brackish Groundwater Resources in the Carrizo-Wilcox Aquifer in South Texas
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Using Electric Logs to Estimate Groundwater Salinity and Map Brackish Groundwater Resources in the Carrizo-Wilcox Aquifer in South Texas

机译：使用电动日志估计地下水盐度和南德克萨斯州Carrizo-Wilcox含水层的咸水地下水资源

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In South Texas, brackish groundwater is a potentially important resource for oil field and agricultural uses. However, it is difficult to distinguish and quantify because few direct salinity measurements are available. In this paper, methods are presented for using resistivity logs to estimate groundwater salinity and to map brackish groundwater resources in the Carrizo-Wilcox Aquifer in South Texas. Electric logs were used to correlate and map stratigraphy and to estimate groundwater salinity. Salinity estimations were based on two methods: (1) empirical relationship between deep resistivity (RO) and formation water salinity; and (2) calculation of formation water resistivity (Rw) using a modified version of the Archie equation. Both methods provide cutoff values of RO to distinguish broad categories of groundwater salinity: fresh (<1000 mg/L total dissolved solids [TDS]), slightly saline (1000-3000 mg/L TDS), moderately saline (3000-10,000 mg/ L TDS), and very saline (>10,000 mg/L TDS). Brackish groundwater includes both slightly saline and moderately saline waters. Each significant (>10 ft thick) sand in the Carrizo-Wilcox Aquifer was assigned to one of these categories, and then cross sections and thickness maps were constructed to locate and quantify the resource. The Carrizoupper Wilcox interval contains most of the fresh groundwater in the aquifer, whereas the lower Wilcox interval contains mainly brackish and saline groundwater. Within Carrizo-upper Wilcox sands, fresh groundwater grades downdip into brackish groundwater without intervening flow barriers. Brackish groundwater in lower Wilcox sands, however, is hydraulically separated from fresh groundwater in overlying sands. Therefore, the lower Wilcox interval is the most favorable target for brackish groundwater production without impacting fresh groundwater resources. Lower Wilcox brackish groundwater sands are thickest in the north and northeast parts of the study area. The lower Wilcox interval contains roughly 423 million acre-ft of brackish groundwater in place in the confined part of the aquifer in South Texas.
机译：在德克萨斯州，咸水地下水是油田和农业用途的潜在重要资源。但是，难以区分和量化，因为很少有直接盐度测量。在本文中，提出了使用电阻率测井来估计地下水盐度的方法，并在南德克萨斯州的Carrizo-Wilcox含水层中映射咸水地下水资源。电动日志用于相关和地图地层和估计地下水盐度。盐度估计基于两种方法：（1）深电阻率（RO）和地层水盐度之间的经验关系; （2）使用Archie方程的修改版本计算形成水电阻率（RW）。这两种方法都提供了对RO的截止值，以区分广泛的地下水盐度：新鲜（<1000mg / l总溶解固体[TDS]），略带盐水（1000-3000mg / L TDS），适度的盐水（3000-10,000mg / L TDS）和盐水（> 10,000mg / L TDS）。咸水地下水包括微生物和中等盐水水。 Carrizo-Wilcox含水层中的每个重要（> 10英尺厚的）沙子被分配给这些类别之一，然后构建横截面和厚度图以定位和量化资源。 Carrizoupper Wilcox间隔含有含水层中的大部分新鲜地下水，而较低的Wilcox间隔主要含有咸咸和盐水地下水。在Carrizo-Upper Wilcox Sands中，新鲜的地下水等级将下拔入咸水地下水，而无需介入流动屏障。然而，下威尔克砂岩的咸水地下水是从覆盖砂中的新鲜地下水液压分离。因此，较低的Wilcox间隔是咸水地下水生产最有利的目标，而不会影响新鲜地下水资源。下威尔科克斯咸水地下水砂在研究区的北部和东北部较厚。较低的Wilcox间隔含有大约42300万英尺的咸水地下水，南德克萨斯州含水层的狭窄部分。

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