CAJ | 학술논문

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。
근거혜민요함사하가조수화학분석수거，탐토수화학성분분포특정，병초보진행지층수래원급성인방면적분석。연구결과표명：사하가조발육적시이Cl-화Na＋＋K＋위주요리자조분적CaCl2형수，광화도급기타수화학조분종향상정증가-감소교체변화적특점。각수화학삼수반영요함내사사단、사삼중하아단화사이단지층교호적봉폐성，지층수총체피CaCO3포화，상미체도CaSO4포화정도。여해수、호수증발곡선진행대비，직관지반영수중리자적부집화빈핍정도，진이진행상응적지층수성인연구，즉사하가조지층수중Na＋、Cl-농축，Ca2＋부집，이급Mg2＋、SO42-빈핍적현상시증발농축작용、사장석납장석화、탈류산작용、유궤질생경등공동작용적결과。차외，평면상사사단이상각층지층수광화도저치구균분포재림남와함내，점토광물탈수작용가이해석와함급주변지층수적담화현상。
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 yet 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.There-by,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+,enrichment of Ca2+,deletion of Mg2+and SO4 2-are owing to the combine effects of evaporation,dolomitization,desulfitation and hydrocarbon generation.Moreover,the low-er-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 phenomenon in the plane.