海洋地质前沿2025，Vol.41Issue(12)：54-67,14.DOI:10.16028/j.1009-2722.2024.264
北部湾盆地海中凹陷涠三段滩坝砂体沉积发育特征及主控因素
Sedimentary development and main controlling factors of beach-bar sand bodies in Haizhong Depression,Beibuwan Basin
摘要
Abstract
Multiple wells drilled in the marine depression of the Beibuwan(Beibu Gulf)Basin in South China Sea have achieved high-yield hydrocarbon flows,confirming its favorable exploration potential.Therefore,studying its sedimentary development characteristics and dominant controlling factors is of great significance.Therefore,investigating the sedimentary evolution patterns and influential factors in this region is crucial.By examining core and well loggings,we analyzed the attributes of beach bar sand bodies and identified sedimentary facies based on seismic attributes and profile interpretation,and ancient geomorphological reconstruction.Results indicate that the beach bar sand bodies had different facies,showing cross-bedding,parallel bedding,storm sedimentary sequences in well core specimens,and"four-sector"pattern in the probability grain size accumulation curves.The well log-gings demonstrated continuous funnel-shaped patterns with multiple reverse cycles,while seismic profile show micro-hump reflections and strong amplitude wave seismic reflections.The beach-bar sand bodied were de-veloped at the southwest-dipping end of the low uplift to the southwest of Weizhou Island and the western side of the gentle slope zone to the south of Weizhou Island.The longitudinal upper beach bar sand bodies were super-posed each other,indicating frequent migration and multi-stage overlapping of the sand bodies in response to fluc-tuations of lake levels.The positioning and distribution of the sand bodies were influenced by terrain relief,mater-ial sources,water depth,and lake level fluctuations in the past.Ancient trough or channel cradled the sand bodies,while underwater low rise or ridge positioned the sandbars.Material sources determined the size of beach bar sand bodies.Additionally,the depth and the direction of local river heading,lake waves,and coastal lake flow determ-ined the depositional range and depth of sedimentary facies from shore to deep lake.This study offered valuable data for future exploration of oil and gas reserves in beach bar reservoirs of the study area and those with similar geological settings.关键词
北部湾盆地/滩坝砂体/反旋回/涠洲组三段/沉积模式Key words
Beibuwan Basin/beach-bar sand/reverse cycle/the third member of Weizhou Formation/sediment-ary model分类
海洋科学引用本文复制引用
冀祥,屈红军,封从军,陈治强,苏帅,朱荣幸..北部湾盆地海中凹陷涠三段滩坝砂体沉积发育特征及主控因素[J].海洋地质前沿,2025,41(12):54-67,14.基金项目
中国石油化工股份有限公司上海海洋油气分公司科研项目"涠西探区重点区带沉积储层精细研究"(34000000-24-ZC0613-0023) （34000000-24-ZC0613-0023）
