准噶尔盆地中拐地区下侏罗统层序地层特征与聚煤控制因素分析

在分析前人对准噶尔盆地层序地层学研究成果的基础上，综合应用岩心、测井和地震资料，对准噶尔盆地西北缘中拐地区下侏罗统进行层序地层划分，总结了层序和体系域界面的识别标志，将下侏罗统划分为4个三级层序和7个体系域，同时叙述了各三级层序的结构特征。通过对层序内含煤岩系的发育特点分析，发现其主力煤层主要发育在JSQI和JSQ3湖侵体系域中，本文作者认为研究区内湖侵时期为有利的聚煤时期，聚煤作用主要受构造沉降、物源供给、气候和沉积环境等因素的控制。

CHARACTERISTICS OF SEQUENCE STRATIGRAPHY AND THE ANALYSIS OF CONTROLLED FACTORS OF THE COAL ACCUMULATION ABOUT THE LOWER JURASSIC IN THE ZHONGGUAI ZONE OF JUNGGAR BASIN

Based on the previous study results of sequence stratigraphy in Junggar basin,according to the drilling,logging and seismic data, classify sequence of the lower Jurassic in the Zhongguai zone of northwestern margin of Junggar basin,it sum up the identification of the boundaries of sequence and system tract,and the lower Jurassic has been divided into four sequences and seven system tracts,at the same time the characteristics of the four sequences＇ composition have been described. Through analysis on the characteristics of coal-bearing strata,it finds that the main coal layers develop in the transgressive systems tracts of JSQ 1 and JSQ3, the author of this paper argues that the transgression is the favorable period of coal accumulation in the studyarea,and the coal accumulation is mainly controlled by tectonic movement.the supply of source, climate and sedimentary environment.