三塘湖盆地马朗地区重矿物特征及物源分析

Analysis for Heavy Mineral Combination Characteristics and Detritus Sources in Malang Depression of Santanghu Basin

通过对马朗地区中上侏罗统重矿物组合特征和稳定系数变化特征研究,结合各层系的石英砂岩百分含量分布,划分了该地区的沉积区域,判断出各沉积分区的物源,认为该区域主要存在南北两大物源体系及相应的两大古水流体系,局部地区存在东南物源,这对于以岩性勘探为主的马朗地区砂岩储层分析预测具有重要的意义。

Through investigation for the heavy mineral combination characteristics and coefficient of stability alternation feature in middle to upper Jurassic formation in Malang depression and combined with percentage content distribution of quartz sandstone in each layer series ,the sedimentary system of this region are divided,and the detritus sources are recognized.Study shows that two source systems in the north and south and two palaeocurrent systems exist in this region,others are southeast.It has important meanings for predicting the sandstone reservoir in Malang depression majored in lithology exploration.