水动力指数方法及其在沉积环境分析中的应用

HYDRODYNAMIC INDEX METHOD AND ITS APPLICATIONTO DEPOSITIONAL ENVIRONMENT

以粒度为基础，提出了水动力指数以反映沉积时的水动力条件，应用趋势面分析将长期地质过程和短期地质过程分离，结合测井曲线类型识别出方盛区内不同成因单位沉积环境在二维空间的配置．研究区东北部主要为冲积扇、扇三角洲和浅湖，而西南部则以深水湖泊和扇三角洲占优势．实践证明，水动力指数方法是十分有效的．

A hydrodynamic index based on the grain size of the clastic rock is proposed in order to represent the hydrodynamic conditions during deposition.Trend surface analysis is used to distinguish the geological process of long period from that of short period.And the 2 D paleoenvironment dispositions of the different units in Fangsheng area,which are mainly alluvial fan,fan delta and shallow lake in the northeast,and deep lake and fan delta are dominant in the southwest,are recognized by means of hydrodynamic index,trend surface analysis and log patterns etc.It has been proved in practice that hydrodynamic index is highly effective.