东营凹陷博东潜山周缘古近系沙河街组沉积相及沉积体系演化

Sedimentary Facies and Sedimentary Systems Evolution of Shahejie Formation in Peripheral Regions of Bodong Buried Hill,Dongying Sag

在对地震、测井、录井及岩心沉积特征等研究的基础上,分析了石村断层的发育特征及其对博东潜山演化的控制作用,系统研究了沙河街组时期沉积相的演化与分布规律。研究表明:石村断层控制了博东潜山的演化,沙四段—沙三下亚段沉积时期,博东潜山快速隆升,对山体两侧沉积面貌影响较大,而对沙二段上部及其上覆地层的影响不明显。研究区沙四上亚段沉积时期到沙三下亚段沉积时期主要发育三角洲前缘和前三角洲亚相,滨浅湖亚相的滩坝、生物滩沉积,以及半深湖—深湖沉积;沙三中亚段沉积时期到沙一段沉积时期主要发育三角洲前缘、前三角洲亚相以及滨浅湖亚相的生物滩等沉积。受石村断层和博东潜山的共同影响,早期(沙四上亚段—沙三上亚段)南北两翼相分异,晚期(沙二下亚段—沙一段)南北两翼相一致。

Based on the seismic survey, logging data and core, this paper analysizes the development charac- teristics of the Shicun fault and its controlling effect on the evolution of the Bodong buried hill, and studies sys- tematically the sedimentary facies types of the Shahejie Formation for the first time. The research shows that the evolution of the Bodong buried hill is controlled by the Shicun Fault. The rapid uplifting of the Bodong buried hill affects the sedimentary geomorphology on both two sides in the Es4 and the lower Es3. However it has a weak effect on the upper Es2 and the layers above. During the sedimentary period when the upper part of the fourth Member of Shahejie Formation deposited and when the lower part of the third Member of Shahejie Forma- tion deposited, here mainly developed delta front subfaeies, prodeha subfacies, beach bar and organic bank deposition of lakeshore-shallow lake subfacies, semi-deep lake deposition and deep lake deposition. During the sedimentary period between the middle part of the third Member of Shahejie Formation deposited and the first Member of Shahejie Formation deposited, here mainly developed delta front subfacies, prodelta subfacies and organic bank deposition of lakeshore-shallow lake subfacies and so on. Under the influence of the Shicun fault and the Bodong buried hill, facies differentiation of the North and South wings can be seen in the early stage （ the Es4 and the upper Esz ） while the same in the late stages （ the lower Es2 and the Es1 ）.