柴达木盆地东台吉乃尔湖西段深层卤水勘探实践与启示

Exploration practice and enlightenment of salt mineral pre-prospecting area in the western segment of East Taijinar Lake,Qaidam Basin

柴达木盆地蕴藏着丰富的盐类矿产资源,但是不同地区的勘探程度存在较大差异。以东台吉乃尔湖西段巴嘎雅乌尔背斜地区的深层盐类矿产资源远景评价为目标,充分分析了预查区的地质、构造与水文地质条件,在此基础上开展了深部钻探和物探工程实践。勘探结果表明,预查区浅部未发现大规模的固体盐类矿产,各项盐类含量也明显偏低,与工业开发指标相差甚远。物探反演结果表明,广域电磁法在预查区不适用于地层划分和断层推断。从储卤层地质与水文地质条件与构造历史演化过程2个方面详细分析了预查区盐类矿产资源匮乏的原因。本次东台吉乃尔湖西段盐类矿产探勘实践丰富了柴达木盆地西部的地质调查工作,并为预查区附近的盐类资源开发提供了一定的参考和启示。

Qaidam Basin is rich in salt mineral resources,but there are great differences in the degree of exploration in different regions.Aiming at the prospective evaluation of deep salt mineral resources in Bagayaur anticline area in the western segment of East Taijinar Lake,this time fully analyzed the geological,structural and hydrogeological conditions of the pre-prospecting area,and carried out deep drilling and geophysical exploration engineering practice on this basis.The exploration results show that no large-scale solid salt minerals are found in the shallow part of the pre-prospecting area,and the salt content is obviously low,which is far from the industrial development index.The geophysical inversion results show that the wide area electromagnetic method is not suitable for stratigraphic division and fault inference in the pre-prospecting area.The reasons for the lack of salt mineral resources in the pre-prospecting area are analyzed in detail from two aspects:the geological and hydrogeological conditions of brine reservoir and the evolution process of structural history.The salt mineral exploration practice in the western segment of East Taijinar Lake enriches the geological survey in the west of Qaidam Basin and provides some reference and inspiration for the development of salt resources near the pre-prospecting area.