燕山地区宣龙坳陷中元古界洪水庄组-铁岭组沉积相分析与层序格架的建立

根据野外露头信息的综合分析,结合沉积模式和层序地层学的基本原理,总结了燕山地区宣龙坳陷洪水庄组和铁岭组的沉积相特征和层序地层格架.研究表明,该区洪水庄组-铁岭组沉积时期为一套局限台地潮坪相沉积,垂向上的沉积微相更能敏锐地反映海平面的相对变化.根据对各个层序界面的识别,将洪水庄组划分为1个三级层序DS1,铁岭组划分为2个三级层序DS2和DS3,由海侵体系域(TST)和高位体系域(HST)组成,不具有形成凝缩层的环境.根据研究区各时期沉积环境与层序地层的特点,建立了符合研究区洪水庄组和铁岭组的沉积模式,初步探讨了研究区所经历的沉积演化过程.

Sedimentary Facies and Sequence Stratigraphic Framework of Hongshuizhuang-Tieling Formations in Xuanlong Depression of Yanshan Region

Based on a comprehensive analysis of outcrop information,combining with the basin principles and methods of sedimentology and sequence stratigraphy,the authors summarized sedimentary facies characteristics and sequence stratigraphic framework of Hongshuizhuang-Tieling Formations in Xuanlong Depression,Yanshan region.The results demonstrate that the study area is a restricted platform lagoon-tidal flat environment in Hongshuizhuang-Tieling Formation sedimentary period.Vertical evolution of sedimentary microfacies can reflect the process of relative sea level more clearly.Based on the identification of each sequence boundary,the Hongshuizhuang Formation can be subdivided into one third-order sequence of DS1.The Tieling Formation can be divided into two third-order sequences of DS2 and DS3.Both are composed of the transgressive systems tract(TST) and the highstand systems tract(HST).It does not have the environment for the formation of condense section(CS).According to the depositional environment and sequence stratigraphic framework in each period in the study area,the sedimentary model of Hongshuizhuang-Tieling Formations were established in the region,which discuss the process of sedimentary evolution in the study area.