陕北三叠系延长统湖盆三角洲沉积模式的建立

ESTABLISHMENT OF LAKE DELTA SEDIMENTARY MODEL FROM YANCHANG SERIES IN NORTH SHAANXI

曾少华

Zeng Shaohua

根据陕北三叠系延长统湖盆三角洲沉积韵律性的特征,选择若干岩石成因单元,通过数理统计求出岩石成因单元之间的共生关系,归纳成纵向序列相关图,参照岩石成因单元厚度统计,建立了湖盆三角洲垂向模式。模式表明该区湖盆三角洲沉积以分流河道砂体发育为特征,属河流作用为主的高建设性的三角洲。

On the basis of sedimentary rhythmic characteristics from lake delta of the Triassic Yanchang Series in North Shaanxi,some petrogenetic units were selected,the paragenetic relationship of the units were found out through mathematical statistics,and the relation-ship was induced to be a vertical sequential correlatograph.According to the thickness statistics of the petrogenetic units,the vertical model of the lake delta was established.The model shows that the lake deltaic sediments are characterized by the development of dis-tributary channel sandbodies belonging to constructive delta resulted mainly by river.

10.11743/ogg19920212