鄂尔多斯盆地成盐条件及找矿方向分析

鄂尔多斯盆地赋存丰富的矿产资源，为全面了解其成盐条件，寻找有利靶区，以钻孔资料、岩性、电性、古生物组合等特征为基础，详细分析了奥陶系中统马家沟组沉积环境和岩性组合。盆地有利的构造环境、地层条件和岩相古地理条件，决定了其较好的成盐条件；潮间坪内凹地，成化泻湖、膏盐湖是成盐的理想场所，主要集中季米脂凹陷及其北缘缓坡地带。研究表明，米脂嘴陷盐矿田周边地区，具有良好的找矿前景。

Analysis of Salt-forming Conditions and Prospecting Direction in Ordos Basin

The Ordos basin is rich in mineral resources. In order to fully understand the salt-forming conditions of Ordos basin and find a favorable target, the paper analyzed the depositional environment and lithologie association of Majiagou formation of the middle series of Ordovieian system in detail aeeording to the borehole data, lithology, electrical characteristics and organic assemblage, etc. The paper pointed out that the favorable structural environment within the basin, the formation conditions and the paleogeographic conditions of lithofacies determined the good salt-forming conditions. The paper also pointed out that a series of valleys, saline lagoons and gypsum salt lakes were the ideal places in the intertidal flat mainly focused on Mizhi depression and the slope zone at the northern fringe of the depression. Therefore, there is a good exploration prospect in the areas surrounding salt fields of Mizhi depression.