库车盆地古近纪岩盐层中钾盐资源量预测研究

新疆库车盆地的古盐湖沉积了巨厚的岩盐层,在构造环境上具备形成钾矿的条件.近年来,在库车盆地古近纪岩盐中发现了众多的钾盐矿物及其组合.文章采用石盐质量法,即通过统计和分析盆地中的石盐质量、海陆相沉积的比值关系及成钾概率,预测出库车盆地古近纪可能沉积的钾盐资源量.其理论基础是,海水和地表水中钾离子与钠离子含量存在一定的比例关系,石盐与钾盐沉积量也应存在固定比值,利用这一比值将已经发现并计算得出的石盐质量转换为钾盐资源量.分析确定库车盆地中带人钾总量的成钾概率是4.69%,据此,预测出可能沉积蕴藏的钾盐资源量(KCl)可达39.78亿t.

Prognosis of potash resource quantity in Eogene rock salt strata of Kuqa Basin, Xingjiang

The ancient salt lake in Kuqa basin with a thick layer of rock salt had the structural environmental conditions for the formation of potash salt deposits. Lots of potash minerals and their associations were found in Tertiary evaporites within Kuqa basin. Making use of the method of rock salt quantity, the authors tentatively predicted the potash resource quantity in Kuqa basin. The procedure of the rock salt quantity method is as follows: first, the quantity of rock salt in Kuqa basin is analyzed; second, the stratigraphic thickness ratio between the marine facies and the continental facies is determined; finally, the probability of the formation of potash minerals is predicted. The theoretical basis of the rock salt quantity method is that potassium ions and sodium ions in sea water and surface water must have a certain proportional relation, and the rock salt and the potassium salt also have a fixed ratio in quantity. On such a basis, the rock salt quantity can be converted into the potash quantity. Accordingly, the probability of the formation of potash minerals in Kuqa basin within the Tarim basin is 4.69% The probable reserved potash salt resource quantity (KCl) in Kuqa basin is up to 3 978 million tons.