海洋地质前沿2025，Vol.41Issue(7)：66-75,10.DOI:10.16028/j.1009-2722.2024.108
基于三维等时地层切片技术的渤海垦利6-A油田新近系明下段Ⅴ油组沉积演化及主控因素研究
Sedimentary evolution and controlling factors of Ⅴ Oil Group in the lower Minghuazhen Formation of Neogene in Kenli 6-A Oilfield,Bohai Sea,based on 3D isochronous stratigraphic slicing
摘要
Abstract
The Ⅴ Oil Group of Kenli 6-A Oilfield in the lower Minghuazhen Formation(MF)of the Neogene is one of the key strata for shallow exploration and development in the Bohai Sea.The MF features shallow water delta deposits widely developed.However,systematic research on its evolution and controlling factors lacks,lead-ing to poor understanding of the spatial distribution and connectivity of sand bodies.Based on the interface identi-fication of seismic,drilling and logging,the Ⅴ Oil Group could be divided into five subgroups corresponding to four fourth-order sequences,based on which a high-precision sequence stratigraphic framework was established.The sedimentary evolution of the Ⅴ Oil Group were reproduced by high-precision isochronous three-dimensional stratigraphic slicing,showing characteristics of large distributary channels in the early Ⅴ-5 subgroup,small dis-tributary channels in the maximum invasion period in the Ⅴ-4 subgroup,the medium-scale channels(channel complexes)in the Ⅴ-2 and Ⅴ-3 subgroups,and the co-existence of large channels and small channels in the lateⅤ-1 sub group.The sedimentary evolution and sand body distribution were mainly controlled by the paleogeo-morphology and stratigraphic sequence and distributed in an orderly manner.Different paleogeomorphology units on the plane controlled the scale of the channel.The large channel distributed mainly in the depression area dur-ing the Ⅴ-1 and Ⅴ-5 periods,the medium channel distributed in the root of the fault terrace during the Ⅴ-2 andⅤ-3 periods,and the small distributary channel distributed in the higher part of the sequence.In the vertical direc-tion,the sequence controlled the change of channel,in which large channels developed at the bottom of the second-or third-order sequence,the medium-scale channel developed at the bottom and top of the fourth-order sequence,and small distributary channel developed near the fourth-order transgressive surface.It is predicted that the poten-tially favorable sand bodies are large channel deposits in the study area,which will effectively guide the sub-sequent exploration deployment and well location optimization,and enrich the understanding of the sedimentary model of the Neogene shallow-water delta in the Bohai Sea.关键词
地层切片/渤海海域/新近系/Ⅴ油组/浅水三角洲/沉积演化Key words
stratigraphic slicing/Bohai Sea/Neogene/Ⅴ Oil Group/shallow water delta/sedimentary evolution分类
海洋科学引用本文复制引用
刘子玉,谢晓军,高玉飞,陈莹,仝中飞,熊连桥,白海强,唐武,李鑫..基于三维等时地层切片技术的渤海垦利6-A油田新近系明下段Ⅴ油组沉积演化及主控因素研究[J].海洋地质前沿,2025,41(7):66-75,10.基金项目
中海油研究总院有限责任公司科技项目"垦利6-1油田及周边油田浅水三角洲典型沉积模式及其对储量动用影响研究"(2022-YXKJ-012) （2022-YXKJ-012）
