古地理学报2016，Vol.18Issue(2)：161-172,12.DOI:10.7605/gdlxb.2016.02.012
渤海湾盆地渤中坳陷渤中25－1油田古近系沙河街组沙二段沉积相及演化
Sedimentary facies and evolution of the Member 2 of Paleogene Shahejie Formation of BZ25-1 Oilfield in Bozhong Depression,Bohai Bay Basin
摘要
Abstract
BZ25-1 Oilfield is located in the south of Bozhong Depression,Bohai Bay Basin and the main pay zone is the Member 2 of Paleogene Shahejie Formation.Based on core observation,as well as data of well log and seismic,it is suggested that two facies,braided river delta facies and lake facies, were developed in the Member 2 of Shahejie Formation.Due to long distance from the provenance,subfa-cies of braided river delta front and shallow lake were mainly developed in the study area.During the depo-sitional period of the Member 2 of Shahejie Formation,the palaeogeomorphy in the study area shows that it was higher in the north and lower in the south.During the early stage of the depositional period of the Member 2 of Shahejie Formation,the lake was shallow and there were mainly beach-bar sand bodies over-lapping from lowland in the southwest to the uplifted area in the northeast.Along with tectonic subsidence and lake water deepening ,the braided river delta front sand bodies prograded from the southwest to the northeast,and finally became dominant in the study area,whereas beach-bar sandbodies faded out gradu-ally.During the late stage,the BZ25-1 -1 wellblock located in the west part of the research area uplifted, which resulted in the total lack of the Member 2 of Shahejie Formation in this wellblock,as well as partial erosion in adjacent areas.关键词
渤海湾盆地/渤中坳陷/沙二段/辫状河三角洲/滩坝/沉积相/沉积演化Key words
Bohai Bay Basin/Bozhong Depression/Member 2 of Shahejie Formation/braided river delta/beach-bar/sedimentary facies/sedimentary evolution分类
天文与地球科学引用本文复制引用
孟昊,钟大康,李超,周军良,秦刚,刘云龙,刘珂茹..渤海湾盆地渤中坳陷渤中25－1油田古近系沙河街组沙二段沉积相及演化[J].古地理学报,2016,18(2):161-172,12.基金项目
国家自然科学基金项目（编号41302108）、国家“973”项目（编号2011CB201104）、中国石油大学（北京）科研基金（编号KYJJ2012－01－18）共同资助。［Co-funded by the National Natural Science Foundation of China（Grant No.41302108），the National Program on Key Basic Research Project （973 Program）（No.2011CB201104）and the Research Fund of China University of Petroleum （Beijing）（No．KYJJ2012－01－18）］ （）
