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内蒙额济纳盆地GN100钻孔的沉积相可划分为河流相、湖泊相、沼泽相及风成砂沉积。对该钻孔不同沉积相代表性沉积物的粒度分析表明:额济纳盆地沉积物的粒度特征能够有效区分沉积环境和动力过程。河流相沉积物主要粒度组分为粗砂,以滚动搬运为主,判别值Y为大于1;风成砂主要粒度组分为细砂,Y值范围主要在0附近;沼泽相也以细砂为主且较风成砂更细,Y值主要为负值且小于风成砂;湖相粒度组分主要为细粉砂,以悬浮搬运为主,但不完全是静水悬浮搬运,相比于静水沉积相对颗粒偏大,而Y最小,为小于-9。这些结果可以为区域沉积环境的准确解释提供参考。
The sedimentary facies of GN100 borehole in Ejin basin of Inner Mongolia can be divided into river facies, lacustrine facies, marsh facies and aeolian sand deposition. The particle size analysis of representative sediments from different sedimentary facies shows that the grain size characteristics of sediments in Ejina Basin can effectively distinguish sedimentary environment from dynamic processes. The main granularity of the sediments in the river facies is coarse sand, which is dominated by rolling. The distinguishing value Y is greater than 1; the main grain size of wind-blown sand is fine sand, the Y value ranges mainly around 0; the swamp facies also uses fine sand Mainly smaller than that of aeolian sand. The value of Y is mainly negative and less than that of aeolian sand. The lacustrine particle size mainly consists of fine silt, which is dominated by suspended sediment transport but not by hydrostatic suspended sediment transport. Relative hydrostatic sedimentation relatively large particles, and Y minimum, less than -9. These results can provide a reference for the accurate interpretation of regional sedimentary environment.