川西坳陷平落坝构造区是我国目前发现的深层海相碳酸盐岩地层中钾离子浓度最高的构造区，同时伴有B,Br,I,Li等多种元素。从平落4井于20世纪90年代初发现富钾卤水以来，研究人员对富钾卤水的成因先后提出了多种认识，主要认为富钾卤水为原生海水沉积变质作用形成。然而，近年来研究发现有很多无法用沉积变质说解释的现象。为此，在研究过程中，不但追踪卤水中溶剂（水）的来源，还关注卤水中溶质的来源，得出了川西坳陷平落坝构造区富钾卤水属于多来源、多期次成因的结论。研究认为：①卤水中水的来源与古海水和成岩作用中含水矿物脱水有关；卤水中钾具有多源多期次成因特点，主要与原始海水浓缩有关，其次与含钾矿物的溶解有关，同时与二叠纪玄武岩、三叠纪绿豆岩及深部流体活动有关。②富钾卤水的成因模式为：膏盐盆地是富钾卤水形成的基础条件；断层是富钾卤水运移的主要通道；夹持在膏盐岩层之间的碳酸盐岩层是富钾卤水的良好储钾层；裂隙和孔洞是富钾卤水储集的主要空间；构造高点是富钾卤水主要储集场所；温度是富钾卤水品位高低的重要因素；厚度大的膏盐岩层是富钾卤水保存的可靠屏障。

With many subordinate useful components, such as boron, bromine, iodine and lithium, the Pingluoba structure region in Western Sichuan Depression is presently the highest concentration in Potassium ion of all the deep marine carbonate strata discovered in China. Since their discovery in the early 1990s at Well Pingluo 4, there are multiple viewpoints to the genesis of potassium-bearing brine. The chief argument is that the potassium-bearing brine is formed through sedimentarymetamorphism in the primary seawater. Some phenomena that cannot be fully explained by the sedimentarymetamorphic theory, have been discovered by the author in the study recently. Therefore, the paper traces the sources of both the solvent (water) and the solute of the brine during the study. Then, the author proposes the conclusions about the multi-source, multi-stage genesis of the potassium-bearing brine in Sichuan basin.① The source of solvent of the brine is related to ancient seawater and the dehydration process of hydrous minerals. According to its genetic characteristics of multi-source and multi-stage, the potassium in brine is mainly related to the concentration of primary seawater, and secondarily the dissolution of potassiumbearing minerals, as well as the Permian basalt, the Triassic green pisolites and some deep fluid activities. ② According to the study result, a genetic model of the potassium-bearing brine in Pingluoba structure region is presented. The gypsum-salt basin is the foundation of the potassium-bearing brine; the fracture constitutes the main channel; the carbonate strata, which lies between the gypsum-salt stratum, forms good reservoir; the fractures and pores are the main reservoir space; the structural highs are the effective storage sites; temperature is the important controlling factor for ore grade; and the gypsum-salt stratum of high thickness are the important secure protection for the preservation of the potassium-bearing brine.