Hydrogen sulphide (H2S) migration in groundwater of the Zechstein strata in the Legnica-Głogów Copper Basin and its vicinity, SW Poland

IF 0.9 4区地球科学 Q3 GEOLOGY Geological Quarterly Pub Date : 2023-11-27 DOI:10.7306/gq.1709

Robert Duda, Elżbieta Bilkiewicz, Roman Becker

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Abstract

Hydrogen sulphide (H₂S) occurs in groundwater in various lithostratigraphic units of the Zechstein Basin in the Legnica-Głogów Copper Basin (SW Poland). This region is located in the Fore-Sudetic Monocline within which, several tens of kilometres NE of the study area, at greater depths, natural gas fields with hydrogen sulphide (H₂S) occur. The Main Dolomite (Ca2), in which H2S-containing natural gas has accumulated, is younger than the Zechstein Limestone (Ca1), which is actively mined. The Ca2 and Ca1 formations are separated by a thick anhydrite succession including a wedge-shaped salt body. Hydrochemical analyses of 18 groundwater samples taken from different horizons within the Zechstein strata showed spatial variability ofH₂S and chloride concentrations. A conceptual model of groundwater flow with dissolved H2S in the Zechstein formations was developed. H₂S migration is associated with groundwater flow between the Ca2 and Ca1 aquifers through fissures in the anhydrite strata that separate them. Hydraulic contact through fissures in the anhydrite layers is the result of long-term exploitation of the underground copper deposit. Groundwater flow between the layers is influenced by a large change in the piezometric pressure of the groundwater in the depression cone caused by mining drainage.

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波兰西南部Legnica-Głogów铜盆地及其邻近地区Zechstein地层地下水中硫化氢(H2S)的迁移

在Legnica-Głogów Copper Basin (SW Poland)的Zechstein盆地的不同岩石地层单元中，地下水中存在硫化氢(H2S)。该地区位于前苏台海单斜中，在研究区域东北数十公里处，在更深的深度，存在硫化氢(H2S)天然气田。主白云岩(Ca2)中富集了含h2s的天然气，比活跃开采的泽希施泰因石灰岩(Ca1)更年轻。Ca2和Ca1地层被厚硬石膏层(包括楔形盐体)隔开。对采自Zechstein地层不同层位的18个地下水样本进行水化学分析，发现了h2s和氯化物浓度的空间变异性。建立了Zechstein地层含溶解H2S地下水流动的概念模型。H2S的迁移与地下水在Ca2和Ca1含水层之间的流动有关，地下水通过硬石膏地层的裂缝将Ca2和Ca1含水层分开。硬石膏层裂隙中的水力接触是地下铜矿长期开采的结果。地下水在层间的流动受到采矿排水引起的凹陷锥内地下水压力变化较大的影响。

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来源期刊

Geological Quarterly 地学-地质学

CiteScore

2.20

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The policy of the Geological Quarterly is to publish significant contributions of information and geological insight relevant to an international readership. The journal has been issued since 1957 at the Polish Geological Institute - National Research Institute and, at present, is the leading Earth sciences journal in Poland. All aspects of Earth and related sciences, and universal and broad regional rather than locally oriented topics are covered. The journal is intended to be an international forum for the exchange of information and ideas, particularly on important geological topics of Central Europe.