塔中地区石炭系碎屑岩岩石学特征与物源分析

Carboniferous Siliciclastic Rocks in Tazhong Area:Their Petrology Features and Material Sources

塔中地区石炭系碎屑岩是优质储层。碎屑岩以砂岩类为主，其中又以石英砂岩类和岩屑砂岩类为主，缺少长石砂岩类。粒度分析表明，碎屑颗粒的分选性除了与沉积环境有关外，还明显受海平面升降、容纳空间的增长速率以及沉积物供给速率控制。区内碎屑岩大多数为离物源区近、堆积速率快的环境下的产物。储层研究表明，碎屑岩的储集物性受沉积相带的控制。通过岩石学研究，结合区域构造发育史及沉积演化史，指出了区内碎屑物源主要来自于沉积盆地内部以及盆地周边再旋回造山带。

Carboniferous siliciclastic rocks in Tazhong area,Tarim Basin are good reservoirs. They mainly consist of sandstone,in which quartzarenite and litharenite are dominant and arkose is lack. It is shown by analysing the grain size of the rocks that the well sorting of elastic grain, depending on the sedimentary environment,is evidently controlled by the eustasy, the growth rate of accommodation space as well as the supply rate of deposits.A majority of clasolites were deposited in the environment of near-by provenance and rapid accumulation.Research on reservoir demonstrate.that the reservoir quality of clastic rocks is governed by sedimentary factes. Based on the petrology,with combination of regional tectonic development and sedimentary evolution,it is pointed out that the material sources of the elastic rocks resulted from the inner part of the Tarim basin and the recycled orogenic zone of the basin periphery.