河床相

主要研究结论如下：1.南京河西地区的沉积土层属于典型的河流二元相结构：上部为河漫滩相沉积的淤泥质粉质粘土层，下部为河床相沉积的砂层。

The main conclusions can be drawn as follows : 1.The deposited soils in Hexi area belong to typical deposited structure of river binary phase : the upper layer is soft soil of floodplain phase , the bottom layer is the sand layer of bed phase .

依据层间氧化带砂岩铀矿岩相准则，该区的泰康组是最有利的层位，河床相沉积最有利层间氧化带型铀成矿，其分布区是铀找矿最有利的地区。

According to the lithofacies criterion for in-situ leachable sandstone uranium ore , Taikang formation is an ideal horizon , river bed facies is suitable for interlayer oxidation type uranium deposit .

河床相、潮坪相和河口湾砂坝相沉积物的频率分布曲线为不对称的双峰式，河漫滩和近岸浅海相的频率分布曲线则呈单峰式。

Frequency distribution curves of sediments from fluvial channel , tidal flat , and estuarine sand bar are all asymmetric bimodal distribution ; whereas , unimodal distribution in floodplain and shallow marine facies .

大安组时期地表水流加强，北部、北西部物质大量带入，沉积范围由北向南扩大，主要沉积以砾岩为主的河道相和以砂岩为主的河床相，仍有一定范围的湖沼相；

Strengthened surface water and enormous material brought from north and west-north and enlarged sedimentation from north to south , the major deposition during Da ' an period are channel facies of conglomerate and river bed facies of sandstone ;

心滩和河床滞留沉积微相上的气井，是剩余气分布的主要地方。

Between of the gas wells on beach heart and bed residence is the main local of distribution of remaining gas .