The integration of sedimentary geological and hydrogeological survey and sample analysis of the representative Cretaceous hydrological boreholes and outcrops has disclosed that during the formation of the Cretaceous aquifers, the fluvial deposits were wide-spread in the Huanhe and Luohe formations in the northern part while the lake deposits occupied in the Huanhe Formation, and desert deposits occurred in the Luohe Formation in the southern part of the Ordos Basin. The framework of sedimentary facies and palaeogeography has exercised a major control not only on mineral compositions such as feldspar, clay minerals, calcite and gypsum in the aquifer systems, soluble salt contents and their spatial distribution.
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