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本文采用沉积学与水文地质学交叉研究的思路,对鄂尔多斯盆地下白垩统含水层储水岩石特征与含水介质结构进行了研究。下白垩统是由宜君-洛河、华池-环河、罗汉洞-泾川三套含水岩组组成的一个厚达1300m、具多层结构的巨型碎屑岩地下水系统,发育以长石砂岩、长石石英砂岩为主的多类型储水砂岩,其沉积形成于以河流、沙漠为主的多种陆相沉积环境。由于受沉积、成岩及后期剥蚀等作用的控制,各含水岩组储水岩石的类型、厚度及分布,以及储水空间的类型和发育程度、储水孔隙介质结构均有明显变化;在与其它水文地质条件的共同影响下,下白垩统地下水赋存和富集条件总体呈现“盆地北好南差、北部上好下差、南部下好上差”的宏观分布规律。
In this paper, the sedimentology and hydrogeology of the cross-cutting research ideas, the Ordos Basin, Lower Cretaceous aquifer rock characteristics of aquifer and aqueous media structure were studied. The Lower Cretaceous is a giant clastic rock groundwater system with a thickness of 1300m and a multi-layer structure composed of three sets of aquiferous rock formations including Yijun-Luohe, Huachi-Huanhe, Lohan-dong and Jingchuan. Sandstone and feldspar quartz sandstone. The sedimentary deposits are formed in various terrestrial depositional environments mainly of rivers and deserts. Due to the control of sedimentation, diagenesis and later denudation, the type, thickness and distribution of water-bearing rocks, the type and development of water storage space and the pore structure of water storage reservoirs all have obvious changes. When compared with others Under the combined effect of hydrogeology and geology, the conditions for the occurrence and enrichment of groundwater in the Lower Cretaceous generally show the macroscopic distribution pattern of “the basin is poor in north and south, the upper and lower are poor in the north and the upper is poor in the south ”.