关键词: 粒度分析, 沉积动力学, 沉积相, 砂体成因, 江汉盆地

Abstract:

The grain  size analysis of  fifteen  specimens  from Honghuatao Formation  in Dangyang area at  the northwestern
boundary of Jianghan basin shows  that  their average diameters, sorting coefficients, skew coefficients and kurtosis coefficients
are mainly  in  the same  range, and  they bear similar  frequency curves of grain size with double peaks and similar probability
cumulative curves with an obvious pattern of three segments. Basing on this and referring to the equation of sedimentary dynamics,
comparative analysis  was done by both hydrodynamic concept and aeolian force concept in this article. A conclusion was drawn
that the genesis of sands in the Honghuatao Formation at the northwestern boundary of Jianghan basin was aeolian deposit, locally
influenced by broken streams.

Key words: grain-size analysis, sedimentary dynamics, sedimentary facies, genesis of sand, Jianghan basin