GRAIN-SIZE CHARACTERISTICS AND SEDIMENTARY ENVIRONMENT OF CANGFANGGOU GROUP IN BEI SHANTAI AREA,XINJIANG

Zhao Yongsheng; Zhao Xiafei

doi:10.11743/ogg19920406

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GRAIN-SIZE CHARACTERISTICS AND SEDIMENTARY ENVIRONMENT OF CANGFANGGOU GROUP IN BEI SHANTAI AREA,XINJIANG
Vol. 13, Issue 4, Pages: 407-417(1992)
Online First：25 December 1992，

Published：1992
DOI： 10.11743/ogg19920406
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DOI：

Zhao Yongsheng, Zhao Xiafei. GRAIN-SIZE CHARACTERISTICS AND SEDIMENTARY ENVIRONMENT OF CANGFANGGOU GROUP IN BEI SHANTAI AREA,XINJIANG[J]. 1992, 13(4): 407-417. DOI： 10.11743/ogg19920406.

摘要

对苍房沟群碎屑岩粒度资料进行分析对比

划分出八种粒度曲线类型。通过对曲线的垂向组合及各总体的分析

结合其它资料

认为苍房沟群的沉积环境为冲积扇、河流(低弯度河沉积)、三角洲和湖泊沉积。指出概率累计曲线和 C-M 图在沉积环境研究中具有较好的效果。

Abstract

Clastic rocks of the Permian-Triassic Cangfanggou Group that consist of conglomerate

sandstone

siltstone

muddy siltstone and mudrock are the main reservoir rocks in Bei Shantai area.Based on typical probability curves and their vertical combina-tion

C-M patterns and grain-size parameters combining with sedimentary sequences and their primary structures

log curves

the sedimentary environment of the group is consi-dered as follows:1.alluvial fan including braided stream and fan interval deposition;2.fluvial depositional systems containing meandering stream

low sinuosity stream and in-terfluvial lake;3.delta and lake system.It is suggested that comprehensive analysis of grain-size distribution is a useful tool in sedimentary facies identification.