�Ĵ������٪��ͳ��կ��������

通过分析早侏罗世大安寨期四川盆地的环境特征，建立了大安寨期湖盆层序的理论模型，并对大安寨组实际沉积层序特征进行了探讨，进而对层序单元作了进上步的划分。实际层序与理论模型对比后发现，二者间的符合度高，研究得出以下结论：①运用可容空间与沉积舶供应速率的关系对坳陷湖盆进行层序分析是完全可行的，理论与实际吻合度高；②构造沉降是大安寨期湖盆层序发育过程中最主要的控制因素；③随着层序的发育，沉积相在垂向上发生

SEQUENCE ANALYSIS OF DA'ANZAI FORMATION OF LOWER JURASSIC IN SICHUAN BASIN

??Through analyzing the sedimentary environment properties in Sichuan Basin during Da'anzai Age of Early Jurassic Epoch,a theoretical model of lake basin sequence in Da'anzai Age is set up,the actual sedimentary sequence properties of Da'anzai Formation are discussed and then the sequence units are further divided in the paper.After having compared the actual sequence with the theoretical model,it is proved that a high coincidence rate is found between both of them.Through studying some conclusions are obtained as follows:??it is fully feasible to carry out the sequence analysis of the downwarped lake basin in consideration of the relation between volumetric space and sedimentary velocity and the theory is highly coincident with practice;??tectonic subsidence was the most important control factor in the process of lake basin sequence development during Da'anzai Age;??vertically,the evolution of sedimentary facies is regular along with the sequence development;and ?? the change of the contrast relation between the rate of volumetric space variation and that of supplying sediments may cause the change of the space matching relation among various sedimentary systems.