珠江口盆地中北部中新统珠江组浪控三角洲沉积时空演化模拟  

Simulation of sedimentary spatiotemporal evolution of wave-dominated delta of the Miocene Zhujiang Formation in north-central Pearl River Mouth Basin

作　　者：杨慧玲 张青青 衡立群 王健[2] 刘太勋[2] 刘建良 刘可禹 YANG Huiling;ZHANG Qingqing;HENG Liqun;WANG Jian;LIU Taixun;LIU Jianliang;LIU Keyu(Tianjin Branch of CNOOC China Limited;School of Geosciences,China University of Petroleum(East China);Shenzhen Branch of CNOOC China Limited;Qingdao National Laboratory for Marine Science and Technology)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津市300452 [2]中国石油大学(华东)地球科学与技术学院,山东省青岛市266580 [3]中海石油(中国)有限公司深圳分公司 [4]青岛海洋科学与技术国家实验室

出　　处：《海相油气地质》2024年第3期291-302,共12页Marine Origin Petroleum Geology

基　　金：中国科学院战略性先导科技专项(A类)(编号:XDA14010401);中国海洋石油总公司“十三五”科技重大项目(CNOOC-KJ 135ZDXM 22 LTD 02 SZ 2016)联合资助。

摘　　要：基于沉积背景、高分辨率层序地层格架及沉积微相展布分析,应用沉积正演模拟方法,综合利用地震、测井、岩心等资料,开展沉积作用和沉积过程的三维时空演化模拟,定量恢复了珠江口盆地中北部中新统珠江组浪控三角洲沉积演化过程,探讨了沉积环境与波浪参数对砂体展布的影响。结果表明:(1)研究区珠江组沉积期的沉积微相随基准面的变化呈规律性演化,滨线呈现先向陆迁移、再向海迁移的趋势。(2)珠江组沉积期的波浪作用较强,波浪角度为近南东方向,波浪作用对三角洲砂体展布具有明显影响。随着波浪高度增加,波浪阻碍三角洲河口细粒沉积物堆积的作用增大,并将其搬运至深水区,泥质沉积物趋向沉积于波基面以下区域,波基面以上区域砂质碎屑含量较高。波浪作用入射角度发生倾斜,会导致三角洲在演化过程中产生不对称的沉积和形态。(3)有利储层砂体主要发育于滨岸线附近。沉积正演模拟为定量恢复沉积演化过程提供更为直观的方法,且在确定浪控三角洲潜在形态方面具有预测作用。Based on the analysis of sedimentary background,high-resolution sequence stratigraphic framework and sedimentary microfacies distribution,by using the method of stratigraphic forward simulation and comprehensive use of seismic,well logging,core and other data,the three-dimensional sedimentary spatiotemporal evolution simulation is carried out,and the sedimentary evolution process of wave-dominated delta of the Miocene Zhujiang Formation in the north-central Pearl River Mouth Basin is quantitatively restored,and the influences of sedimentary environment and wave parameters on the distribution of sand bodies are discussed.The results indicate that:(1)Being located at the coastal area of a shallow continental shelf,the study area was subject to strong wave action during the Miocene,developing a typical wave-dominated delta sequence,and the sedimentary microfacies of the Zhujiang Formation evolved regularly with the change of the base level,and the shoreline moved first to the land and then to the sea.(2)The wave action during the Zhujiang Formation sedimentation period is strong,and the wave angle is near the southeast direction.The wave action has a significant impact on the distribution of the delta sand body.With the increase of wave height,the effect of impeding the accumulation of fine sediment in the delta estuary increases,and it is transported to the deep water area;muddy sediments are deposited in the area below the wave base,while sandy sediments in the area above the wave base have a higher content.The inclination of the incident angle in wave action can lead to asymmetric sedimentation and morphology in the evolution of delta.(3)The evolution characteristics of basin filling in the time domain indicate that favorable reservoir sand bodies are mainly developed near the shoreline,and source rocks are concentrated on slopes.Sedimentary forward simulation provides a more intuitive method for quantitatively restoring sedimentary evolution processes and has predictive value in determining the potential morphol

关 键 词：浪控三角洲 沉积演化 正演模拟 珠江组 珠江口盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]