Abstract The lower Eagle Ford Group (LEFG) is one of the most productive continuous hydrocarbon plays in the United States but few associated produced waters data and minimal interpretation have been published. This effort focuses on results from compositional and isotopic data from 39 produced water samples collected from horizontal wells producing from the LEFG in south central Texas. The depth of the LEFG increases by approximately 1 km across the study area, from northwest (2.9 km) to southeast (3.9 km). Associated increases in calculated reservoir temperature (125–165 °C), development of reservoir over-pressuring (400–800 bars total pressure), and increased thermal maturity (heavy oil to gas condensate) also occur along this trend. Produced water salinity starts at nearly 100 g/L in the shallowest samples and decreases linearly with depth to

中文翻译：

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德克萨斯州中南部墨西哥湾沿岸盆地下伊格尔福特群地层水的成因和地球化学

摘要 伊格尔福特下游群 (LEFG) 是美国产量最高的连续油气田之一，但很少有相关的采出水数据和最低限度的解释被公布。这项工作的重点是从德克萨斯州中南部 LEFG 生产的水平井收集的 39 个采出水样品的成分和同位素数据结果。从西北（2.9 公里）到东南（3.9 公里），LEFG 的深度在整个研究区域增加了大约 1 公里。沿着这一趋势，计算出的储层温度（125-165 °C）、储层超压（400-800 bar 总压力）和热成熟度增加（重油凝析油）的相关增加也发生了。在最浅的样品中，采出水的盐度从接近 100 g/L 开始，并随着深度线性下降至