粒度资料的沉积动力学在沉积环境分析中的应用:以江汉盆地西北缘上白垩统红花套组沉积为例  

Use of Sediment Dynamic Analysis in Environment Interpretation: A Case Study on Honghuatao Formation, Upper Cretaceous of Western Jianghan Basin, Hubei Province

作　　者：朱锐[1] 张昌民[1] 龚福华[1] 易雪斐[1] 

机构地区：[1]长江大学地球科学学院,荆州434023

出　　处：《高校地质学报》2010年第3期358-364,共7页Geological Journal of China Universities

基　　金：国家自然科学基金项目(40572078)

摘　　要：通过对江汉盆地西北缘当阳地区上白垩统红花套组地层的15个样品进行粒度分析,发现样品的平均粒径、分选系数、偏度和峰度均在同一值域范围内;频率分布曲线相似,呈双峰态;概率累积曲线呈明显的两跳一悬三段式。结合沉积动力学公式,分别以水动力和风动力两种假设对粒度资料进行了分析。最终得出江汉盆地西北缘上白垩统红花套组砂体为风成砂,局部有间歇性河流影响。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.

关 键 词：粒度分析 沉积动力学 沉积相 砂体成因 江汉盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]