| 惠民凹陷沙河街组地层水化学特征及其成因 |
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| 引用本文： | 刘元晴,曾溅辉,周乐,翟圣佳.惠民凹陷沙河街组地层水化学特征及其成因[J].现代地质,2013,27(5):1110-1119. |
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| 作者姓名： | 刘元晴 曾溅辉 周乐 翟圣佳 |
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| 作者单位： | 中国石油大学(北京)油气资源与探测国家重点实验室，北京 102249 |
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| 基金项目： | 国家科技重大专项(2011ZX05006-001)；国家自然科学基金项目(41172128)。 |
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| 摘 要： | 根据惠民凹陷沙河街组水化学分析数据，探讨水化学成分分布特征，并初步进行地层水来源及成因方面的分析。研究结果表明:沙河街组发育的是以(Cl-和Na++K+为主要离子组分的(CaCl2,型水，矿化度及其他水化学组分纵向上呈增加-减小交替变化的特点。各水化学参数反映凹陷内沙四段、沙三中下亚段和沙二段地层较好的封闭性，地层水总体被CaCO3饱和，尚未达到CaSO4饱和程度。与海水、湖水蒸发曲线进行对比，直观地反映水中离子的富集和贫乏程度，进而进行相应的地层水成因研究，即沙河街组地层水中Na+, Cl-浓缩，Ca2+富集，以及Mg2+ 、 SO42-贫乏的现象是蒸发浓缩作用、斜长石钠长石化、脱硫酸作用、有机质生烃等共同作用的结果。此外，平面上沙四段以上各层地层水矿化度低值区均分布在临南洼陷内，粘土矿物脱水作用可以解释洼陷及周边地层水的淡化现象。
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| 关 键 词： | 惠民凹陷 地层水化学特征 地层水成因 蒸发浓缩作用 钠长石化 |
| 收稿时间： | 2013-06-15 |
| 修稿时间： | 2013-07-20 |
Geochemical Characteristics and Origin of Shahejie Formation Water in Huimin Sag |
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| LIU Yuan-qing
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ZENG Jian-hui
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ZHOU Le
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ZHAI Sheng-jia.Geochemical Characteristics and Origin of Shahejie Formation Water in Huimin Sag[J].Geoscience——Journal of Graduate School,China University of Geosciences,2013,27(5):1110-1119. |
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| Authors: | LIU Yuan-qing ZENG Jian-hui ZHOU Le ZHAI Sheng-jia |
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| Institution: | State Key Laboratory of Petroleum Resources and Prospecting ,China University of Petroleum，Beijing 102249 |
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| Abstract: | Based on the analysis of Shahejie Formation water in Huimin Sag，the geochemical characteristics and origin of formation water were analyzed. The results show that these waters are of CaCl2 type with main chemical composition of anion Cl- and cation (Na++K+).Vertically，the chemical composition of these waters alternately increased and decreased. The water chemistry parameters reflect the Member 2 and Member 4，the middle and lower Member 3 of Shahejie Formation have good sealing. The formation water was saturated by CaCO3，but not vet saturated by CaSO4. The degree of ions' enrichment and deletion can be presented by using of the composition contrasting with the seawater and lacustrine saline-water evaporation trajectory. Thereby，the origin of formation water was analyzed based on ions' enrichment and deletion，and the result indicates the appearance of concentration of Cl- and Na+，enriohment of cazenrichment of Ca2+，deletion of Mg2+ and SO42- are owing to the combine effects of evaporation，dolomitization，desulfitation and hydrocarbon generation. Moreover，the lower-salinity areas in which each formation above the Member 4 of Shahejie Formation has lower-salinity water all occur in Linnan sag，and the clay mineral dehydration in Linnan sag can be used to interpret this phenomenonin the plane. |
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| Keywords: | Huimin Sag geochemical characteristics of formation water origin of formation water evaporating concentration albitization |
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