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

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.