中国东部地区白垩—第三系含盐盆地(咸)卤水水化学特征

HYDROCHEMISTRY OF (SALINE) BRINE IN CRETACEOUS-TERTIARY BASINS OF EASTERN CHINA

通过对大量实际资料的统计分析发现,由于盆地的形成机理、物质补给来源和成盐条件的不同,中国东部地区白垩—第三系含盐盆地(咸)卤水水化学性质在平面上具有明显的差异性;在同一构造单元内,(咸)卤水矿化度与埋深成正比增长关系,其水型也随埋深增加而发生规律性变化。前者是地质历史过程中重力场作用的结果,而后者则是后期地质、地球化学作用所致。

As revealed through statistical analysis of abun- -dant factual data, there are remarkable lateral variations of (Saline) brine in Cretaceous-Tertiary basins of eastern China due to the differences in the formation mechanism of basins, source of material recharge and salt-forming candition. Within a same tectonic unit, the mineralization degree of (saline) brine increases in proportion with its burial depth, and the water type also varies regularly with the increase of depth, of these, the former variation is resulted from the gravity field in the course of geologic history, while the latter, from the geological and geochemical processes in the later stage.