惠民凹陷沙河街组地层水化学特征及其成因

现代地质 ›› 2013, Vol. 27 ›› Issue (5): 1110-1119.

惠民凹陷沙河街组地层水化学特征及其成因

刘元晴^1,2,3，曾溅辉^1,2，周乐^{1,2 ,3}，翟圣佳^1,2,4

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

收稿日期:2013-06-15 修回日期:2013-07-20 出版日期:2013-10-17 发布日期:2013-10-31
作者简介:刘元晴，男，硕士，1988年出生，矿产普查与勘探专业，主要从事含油气盆地流体分析方面的研究。 Email：lyq198896@126.com
基金资助:
国家科技重大专项(2011ZX05006-001);国家自然科学基金项目(41172128)

Geochemical Characteristics and Origin of Shahejie Formation Water in Huimin Sag

LIU Yuan-qing^1,2,3，ZENG Jian-hui^1,2，ZHOU Le^1,2,3，ZHAI Sheng-jia^1,2,4

State Key Laboratory of Petroleum Resources and Prospecting ,China University of Petroleum，Beijing 102249

Received:2013-06-15 Revised:2013-07-20 Online:2013-10-17 Published:2013-10-31

摘要/Abstract

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⁺ 、 SO₄^2-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。

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

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 SO₄^2- 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.

Key words: Huimin Sad, geochemical characteristics of formation water, origin of formation water, evaporating concentration, albitization

中图分类号:

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.

LIU Yuan-qing，ZENG Jian-hui，ZHOU Le，ZHAI Sheng-jia. Geochemical Characteristics and Origin of Shahejie Formation Water in Huimin Sag[J]. Geoscience, 2013, 27(5): 1110-1119.

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