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在我国西部相当数量的中新生界盆地中，发育半咸水－咸水的沉积，水介质条件决定了这类盆地中碳酸盐储层的形成、发育和分布．因此，对于这类湖盆古水介质的恢复，具有十分重要的现实意义．以酒东盆地营尔凹陷为例，利用稳定同位素、微量金属元素和生物标志化合物参数等方法，综合分析了中生界湖盆的古水介质条件．根据中生界地层古水介质相对盐度和岩性等特征，把古湖盆分为正常湖泊和咸化湖泊两种类型．通过各种方法的综合分析可以看出，整个营尔凹陷南、北部的中生代的沉积水介质是比较一致的，基本上为微咸水到半咸的水介质条件，其中偶夹淡水河流相沉积．以下白恶统中沟组沉积水介质盐度最大，这一层段也是碳酸盐岩最为发育的层段，是碳酸盐岩储层勘探的有利目标．
In a considerable number of Mesozoic-Cenozoic basins in western China, the development of brackish-brackish water and the development of aquatic media determine the formation, development and distribution of carbonate reservoirs in these basins. Therefore, the restoration of ancient water media in this kind of lake basin has very important practical significance. Taking the Er'er depression in Yandong Basin as an example, the paleoclimate conditions in the Mesozoic lacustrine basin were comprehensively analyzed by means of stable isotopes, trace metal elements and biomarker compounds. According to characteristics of relative salinity and lithology of Paleoarthrocells in Mesozoic strata, the ancient lakes are divided into two types: normal lakes and salty lakes. Through the comprehensive analysis of various methods, we can see that the Mesozoic sedimentary aquifer medium in the south and north of Ying'er Depression is relatively consistent, which is basically the condition of brackish water to semi-salty water medium, . The following sediment aquifers in the Baiyou Tongzhong Formation have the highest salinity, and this layer is also the most developed carbonate rock layer, which is a favorable target for carbonate reservoir exploration.