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冀中坳陷的晋县凹陷中，北部Ｅｓ４－Ｅｋ１段盐湖相未成熟阶段含膏烃源岩中的可溶有机质所形成的原油属未熟油，如赵兰庄、赵县油田等。这种未熟油具有高密度（０．９８～１．０８ｇ／ｃｍ３），高粘度、高胶质＋沥青质和高含硫量（６．５％～１５％）等特征；正构烷烃常常呈明显的偶数碳优势，环烷烃和异构烷烃含量很高，有的甚至掩盖正构烷烃的分布，表现出未熟油和非生物降解的特征。其盐湖相和强还原或硫酸盐环境沉积的含膏泥岩在未成熟阶段具有丰富的可溶有机质含量（“Ａ”大于０．２％）。并非干酪根热降解成烃，而是浮游水生生物的残留烃类，它具有较高的转化率，“Ａ”／ＴＯＣ平均达５５％和有利的排烃条件，具备了形成未熟油藏的条件而且具有良好的勘探前景
The crude oil formed by the dissolved organic matter in the source rocks of immature salt in the Es4-Ek1 salt section of the middle and northern part of the Jinshen Sag in Jizhong Depression is an immature oil, such as Zhao Lanzhuang and Zhao County Oilfield. This immature oil has the characteristics of high density (0.98 ~ 1.08g / cm3), high viscosity, high glial + asphaltene and high sulfur content (6.5% ~ 15%) and other characteristics; n-alkanes are often Significant even carbon advantage, naphthenic and isoparaffin content is very high, and some even cover up the n-alkanes distribution, showing immature oil and non-biodegradable characteristics. Palygorskite, whose lacustrine facies and strongly reduced or sulphate environments are deposited, have abundant soluble organic matter (“A”> 0.2%) in the immature stage. It is not a hydrocarbon that is thermally degraded by kerogen, but rather a residual hydrocarbon from planktonic aquatic organisms that has a high conversion rate, with an average “A” / TOC of 55% and favorable hydrocarbon expulsion conditions, with conditions for formation of an immature reservoir And has a good prospect of exploration