东濮凹陷盐湖准层序发育特征研究

The Characteristics of Parasequence and Its Applied Significance in Continental Lake Basin

中文关键词:  准层序 陆相地层 东濮凹陷 陆相层序地层学 发育特征 高分辨层序地层 海相地层 供给 理论 发展

英文关键词:Parasequence,Sequence stratigraphy,Sositive cadence,Salt formed in deep water,Ccontinental lake basin

中文摘要:

      层序地层学理论是在研究海相地层的基础上发展起来的，它注重的是地层的沉积成因和周期性的旋回变化。准层序是层序的基本组成单元，代表一个水体向上变浅的沉积过程，在开展层序地层学研究工作时加强对准层序的分析非常重要。通过应用岩心、测井等资料开展高分辨层序地层学研究发现，陆相地层中准层序的发育特征与海相明显不同，表现为以向上变细的正韵律为主。通过深入分析影响陆相地层层序发育的主要控制因素，指出构造是决定湖盆有无的先决条件，气候和沉积物供给是层序发育的决定性因素。研究成果进一步丰富了陆相层序地层学理论，使得层序边界的划分和识别更趋合理和可操作性，使等时性地层对比和岩性对比趋于统一，从而也可以更好地开展沉积相和沉积微相描述。通过实际应用，进一步明确了东濮凹陷深水成盐观点，指出砂岩与盐岩属于夹在稳定泥页岩中的同时异相的沉积体，这种认识为东濮凹陷深层低渗透储层地震预测提供了新的思路。

英文摘要:

      :The sequence theory developed from the study of the marine formation focusses on the depositional genesis and periodic changes of formation.As the basic unit of one sequence,the parasequence is a sedimentary process when water shoaling.After the study of high-resolution sequence stratigraphy on the core,and loging data,the author finds that the parasequence charactehstics are dififerent in continental forimation from that in marine formation. The parasequence is a thinning and fining upward cadence.After the analysis of the controlling facts of continental sequence,the paper indicates that tectonics is the main reason to form a lake basin and the climate and the sedimentary supply are the decisive factors to sequence.This makes the partition and identiflcation of sequence boundaries more reasonable and more maneuverable,and unifies the sgnchronostratigraphic and lithostratigraphic correlation.This paper enriches the sequence theory,and this method is useful to describe sedimentary facies and microfacies.The author confirms that the salt rock was formed in deep water in Dongpu depression,and indicates that sandstone and salt stone have sediment as the same time and all nipped between the steady mudstone and (or)shale stone.Base on this analysis,a new measure of the seismic reservoir prediction has been found to low permeable strata in Dongpu depression.