四川盆地中三叠统成都盐盆富钾卤水地球化学特征及其勘查开发前景研究

成都盐盆富钾卤水以深层卤水形式赋存于地下4600m左右的中三叠统雷口坡组第四段（T2l4）含盐系的碳酸盐岩储层中。富钾卤水与海水蒸发系列各浓缩阶段相比,K+、B3+含量异常高,分别达53.27g/L和4994mg/L,超过海水钾盐沉积阶段,也超过综合利用和单独开采工业品位,成为当今世界上罕见的液态钾硼资源。富钾卤水尚富含Br、T、Sr2+、Li+、Rb+等多种有用成分,品质优异,构成优质化工原料水,经济价值极高。卤水具高承压、自溢特点,弹性储量大,具勘查开发前景。富钾卤水为沉积变质卤水和固态钾盐溶滤的复合成因。

GEOCHEMICAL CHARACTERISTICS OF POTASSIUM-RICH BRINE IN MIDDLE TRIASSIC CHENGDU SALT BASIN OF SICHUAN BASIN AND ITS PROSPECTS FOR BRINE TAPPING

The potassium-rich brine of the Chengdu salt basin occurs in the form of deep brine about 4000m under the surface at the forth member (T2I4) of the Middle Triassic Leikoupo group. Compared with the different concentration stages of the general sea water, it contains singularly high amounts of K+ and B3+, respectively 53.27g/L and 4994mg/L, not only exceeding those of the sea water during potassium concentration and precipitation but also going over the grades needed for industrial exploitation and comprehensive utilization. Besides K and B, it carries several kinds of useful components such as Br-, T, Sr2+, Li+ and Rb+, thus becoming a high quality raw solution for chemical industry. The brine enjoys better prospects for development in view of its being enough strongly confined for it to flow upwards and of its larger elastic reserves. Its generation is attributed to a composite event concerning both brine metagenesis and dissolution-filtration of solid potassium salt.