渤海湾盆地渤南洼陷古近系沙河街组二段沉积相特征及演化

发布时间：2018-03-03 16:05

本文选题：扇三角洲　切入点：滩坝　出处：《石油与天然气地质》2016年04期 　论文类型：期刊论文

【摘要】：为了查明渤海湾盆地渤南洼陷沙河街组二段沉积相分布与演化规律,为油气勘探寻找接替区,在岩心、测井、录井及地震综合研究的基础上,对沙河街组二段进行了砂层组划分与对比,进而圈定了各个时期沉积相的展布范围并总结了沉积演化规律。研究结果表明:渤南洼陷沙二段可划分为4个砂层组,各砂组依次向南逐层超覆,沉积范围不断扩大。洼陷周缘凸起带附近主要发育扇三角洲前缘沉积,以水下分流河道微相为主;其次为河口砂坝与水下分流间湾。洼陷内部以滨浅湖滩坝为主,按其成因可分为正常砂质滩坝、砂岩-碳酸盐岩混积型滩坝以及风暴成因滩坝三类,不同类型砂坝分布规律各不相同。沙二段整体呈湖盆不断扩张、沉积范围不断扩大、扇三角洲分布减少而滩坝沉积规模不断扩大的沉积演化特征。
[Abstract]:In order to find out the distribution and evolution of sedimentary facies in the second member of Shahejie formation in Bonan sag, Bohai Bay Basin, and to find a replacement area for oil and gas exploration, on the basis of core, logging, logging and seismic comprehensive study, The second member of Shahejie formation is divided and contrasted, the distribution range of sedimentary facies is delineated and the sedimentary evolution law is summarized. The results show that the second member of Shahejie formation in Bonan depression can be divided into four sand formations. The sedimentary range of each sand formation is gradually overlying to the south. The fan delta front deposits are mainly developed near the uplift zone around the margin of the depression, and the subaqueous distributary channel microfacies is the main one. Secondly, the intertidal bay between estuarine sand dam and underwater distributary. The interior of depression is dominated by shore-shallow beach dam, which can be divided into three types according to its origin: normal sandy beach dam, sandstone carbonate rock mixed type beach dam and storm origin beach dam. The distribution law of different types of sand dams is different. The second member of Shahejie is characterized by the continuous expansion of lake basin, the continuous expansion of sedimentary range, the decrease of fan delta distribution and the continuous expansion of beach and dam sedimentary scale.
【作者单位】：中国石油大学(华东)地球科学与技术学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;
【基金】：国家科技重大专项(2011ZX05009-002) 高等学校博士学科点专项科研基金项目(20120133120013)
【分类号】：P618.13

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