文安斜坡东营组沉积相研究

Sedimentary facies study of Dongying Formation in Wenan slope

从岩心相,测井相,沉积展布几个方面对文安斜坡东营组的总体沉积特征进行了论述,并将研究区的沉积相类型定义为河流相。通过对研究区岩心相的详细分析,认为东营组主要发育有边滩微相、天然堤微相和泛滥平原微相。在岩心相分析的基础上发现了对沉积相响应较好的三类测井曲线,得出了研究区的测井相模式。根据对该区东营组沉积相的平面展布特征的研究表明,研究区以河流沉积和泛滥平原沉积为主,河道类型主要为曲流河至网状河,总体上呈由东向西方向展布,由早期的河道向下侵蚀作用为主到中晚期的河道侧向侵蚀作用为主,向湖盆方向河道变宽变浅直至消失,呈泛滥平原化,并在此基础上分析得出了泛滥平原化河流相的相模式。

The overall sedimentary facies characteristics and distribution of sedimentary facies have been discussed in this article based on core and log data study.The sedimentary facies of the study area is determinated as fluvial facies through a detailed study.Through a detailed analysis of core data from the study area,it is believed that that Dongying Formation is dominated by point bar microfacies,natural levee microfacies and floodplain microfacies.Based on the core data analysis,it is found that three types of logging curves response well to sedimentary facies,and the logging facies model has been constructed.According to the sedimentary facies distribution of Dongying Formation,fluvial deposition and flood plain deposition are mainly developed in the study area,the main types of river are meandering river to anastomosing rivers,distributing from east to west.In the early stage,downward erosion was dominated and lateral erosion was dominated in the mid-late stage.The river became shallow and widened until it disappeared towards the lake basin and became a flood plain.Based on this analysis,the flood plain of fluvial sedimentary facies model has been constructed.