淮北新矿区新生界底部松散沉积物沉积特征及水理性质  

SEDIMENTARY FEATURES AND HYDROLOGICAL PROPERTIES OF LOOSE SEDIMENTS AT THE CENOZOIC BOTTOM IN THE HUAIBEI NEW MINING AREA

作　　者：张朱亚[1] 

机构地区：[1]安徽省煤炭科学研究院,安徽合肥230001

出　　处：《安徽地质》2009年第4期241-246,共6页Geology of Anhui

摘　　要：分析了淮北新矿区新生界底部松散层沉积物沉积特征及水理性质,尤其是四含的岩性组合结构。在对各级粒径之间的相互掺杂进行统计的同时,对岩层的厚度,物理性质,水理性质,矿物形态及含量进行进一步的研究。得出结论:淮北煤田新矿区松散沉积物第四含水层是以下部含粘性土砂砾层和上部夹砂层的粘性土段组成。分布较稳定,但厚度和岩性有较大变化,主要受古地形和古地理位置的控制。各种粒级的沉积物相互掺杂,颗粒分布不均一,砂性土的有效粒径与其本身定名粒级相比低2～3个粒级,其透水性与比其低2个粒级沉积物相当。四含不仅具有隔水性,而且有较强的持水性。This paper analysed sedimentary features and hydrological properties of loose sediments at the Cenozoic bottom in the Huaibei new mine area, especially the lithological assemblage structure of the fourth aquifer, while making statistics of the mixed various grain sizes, further studied the thickness, physical properties, hydrological properties, mineral morphology and contents of the rock beds, and concluded that the fourth aquifer consists of the lower clayey-bearing sand-gravel layer and upper layer of clayey soil intercalated with sand, it distributes stably, but varies a lot in thickness and lithology, and is mainly controlled by palaeotopography and paleogeography. Sediments of various grain sizes are mixed together, grains are in uneven distribution, effective grain sizes of sandy soils are 2 to 3-order lower than those they are named after, and their permeability is equivalent to that of sediments 2-order lower in grain size. The fourth aquifer is not only water-isolated, but also strong in water-retaining property.

关 键 词：沉积特征 水理性质 松散沉积物 新生界底部 淮北新矿区 

分 类 号：P588.2[天文地球—岩石学] P641[天文地球—地质学]