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济阳坳陷东营凹陷古近系沙河街组沉积相
引用本文:王居峰.济阳坳陷东营凹陷古近系沙河街组沉积相[J].古地理学报,2005,7(1):45-58.
作者姓名:王居峰
作者单位:中国地质大学,北京,100083;中国石化胜利油田地质科学研究院,山东东营,257015
摘    要:济阳坳陷东营凹陷的主要含油层系为古近系沙河街组。沙河街组各段沉积相的展布各具特征,演化序列清楚。沙四段早期主要发育冲积—洪积扇,分布于湖盆的边缘地区;沙四段晚期,受北断南超的箕状构造背景控制,由北向南依次发育了近岸水下扇、滑塌浊积扇、半深湖相和滨浅湖濉坝相沉积。沙三段沉积时期是三角洲发育的鼎盛时期,三角洲的主体主要分布于凹陷的东部和中部地区,伴随着三角洲自东向西的推进及湖盆范围的不断缩小,沉积类型由早期的三角洲—滑塌浊积扇、三角洲—坡移浊积扇体系向晚期的河流—三角洲体系演化。南部斜坡带以河流相沉积为主,北部陡坡带垂向上由近岸水下扇—滑塌浊积扇、三角洲和辫状河三角洲组成。经过沙三段沉积时期三角洲等的填平补齐作用,到沙二段沉积时期以河流相沉积为主,只在凹陷西部的利津洼陷发育小规模的三角洲—浅湖相沉积。沙—段沉积时期湖盆发生大规模湖侵,物源供应减弱,以滨、浅湖相沉积为主,在凹陷南部边缘发育有滩坝相沉积。

关 键 词:沉积相  演化  古近系  沙河街组  东营凹陷  济阳坳陷
文章编号:1671-1505(2005)01-0045-14
修稿时间:2004年5月9日

Sedimentary facies of the Shahejie Formation of Paleogene in Dongying Sag,Jiyang Depression
WANG Jufeng.Sedimentary facies of the Shahejie Formation of Paleogene in Dongying Sag,Jiyang Depression[J].Journal of Palaeogeography,2005,7(1):45-58.
Authors:WANG Jufeng
Abstract:The Shahejie Formation of the Paleogene is the main petroliferous strata in the Dongying Sag of Jiyang Depression in Bohai Bay Basin.The distribution features of sedimentary facies of every member in the Shahejie Formation are characteristic and the evolution of sedimentary facies is clear.During the early sedimentary period of Member 4 of Shahejie Formation,the main facies was alluvial fan,which was distributed at the edge of the Dongying Sag.During the late sedimentary period of Member 4 of Shahejie Formation,controlled by the northern-faulted and southern-overlapped structural setting,facies of inshore-submerged fan,slump turbidite fan,semi-deep lake,shallow lake,lake shore and beach-barrier facies were developed successively from north to south.During the sedimentation of Member 3 of Shahejie Formation,the deltas were widely spread.The deltas were mainly distributed in the middle and east parts in Dongying Sag.As the deltas advanced forward from east to west and the lake shrank,the types of sedimentary facies changed from delta-slump turbidite fan and delta-slope-moving turbidite fan in the early sedimentary period to fluvial deltas in the late sedimentary period of Member 3 of Shahejie Formation.The main body of deltas was located in the middle part of Dongying Sag.The southern slope was mainly fluvial facies.The sedimentary facies of the northern steep slope were inshore-submerged fan,slump turbidite fan,deltas and braided deltas.Through the uplift,erosion and sedimentation during the sedimentary period of Member 3 of Shahejie Formation,the Member 2 was mainly fluvial facies.Deltas and shallow lake facies were only developed in the Lijin sub-sag in western Dongying Sag.During the sedimentary period of Member 1 of Shahejie Formation,large scale of lake transgression occurred.The main facies were shallow lake and lake shore,while at the south edge of the Dongying Sag,beach-barrier facies was developed.
Keywords:sedimentary facies  evolution  Paleogene  Shahejie Formation  Dongying Sag  Jiyang Depression
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