| 珠江口盆地白云南洼珠海组陆架边缘三角洲沉积体系演化 |
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| 引用本文： | 舒梁锋,张向涛,张忠涛,张丽丽,雷胜兰,高中亮,韩霄,于飒.珠江口盆地白云南洼珠海组陆架边缘三角洲沉积体系演化[J].沉积学报,2022,40(3):825-837. |
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| 作者姓名： | 舒梁锋 张向涛 张忠涛 张丽丽 雷胜兰 高中亮 韩霄 于飒 |
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| 作者单位： | 中海石油（中国）有限公司深圳分公司，广东 深圳 518054 |
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| 基金项目： | 中海石油有限公司十三五科技重点项目 |
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| 摘 要： | 珠江口盆地白云南洼珠海组发育陆架边缘三角洲，其不仅是深水区勘探重要的油气储层类型，也是沉积地质学和石油地质学研究的热点。根据高精度三维地震资料，应用三级层序格架内等时地层切片技术，对珠江口盆地白云南洼珠海组陆架边缘三角洲的沉积结构和平面演化开展了详细研究。研究表明，区内存在北部和西北部两个物源方向的陆架边缘三角洲物源供给体系，进而形成连续4期三角洲前积复合体，各期次通过解剖三角洲前积结构和叠置样式可细分为2~5套三角洲前积体，地震上表现为切线斜交型和S型反射结构。不同物源供给体系下的三角洲进积和加积速率差异明显，根据陆架边缘三角洲的演化阶段可划分为初始形成期、发展期和稳定期三个阶段。初始形成期为珠海组四段中晚期，三角洲垂向上均表现为进积，平面上北部物源供给的陆架边缘三角洲形成面积小，西北部物源供给的三角洲面积相对大；发展期为珠海组三段，三角洲垂向上进积和加积均存在，陆架边缘三角洲沉积厚度达到最大，平面上北部物源供给的陆架边缘三角洲—深水扇体系发育一定规模，西北部物源供给的陆架三角洲前缘发育陆架条带砂脊；稳定期为珠海组二段和一段，三角洲垂向结构表现为先进积后加积，三角洲前缘规模变大，陆坡水道和深水扇最为发育。珠海组时期陆架边缘三角洲形成演化受双物源差异供给、相对海平面的先升后降和构造活动的相对稳定共同控制。北部物源供给的珠海组陆架边缘三角洲—深水陆坡沉积体系可作为区内最有利的油气勘探目标。
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| 关 键 词： | 珠江口盆地 沉积演化 陆架边缘三角洲 白云南洼 珠海组 |
| 收稿时间： | 2021-03-30 |
Evolution of the Shelf-margin Delta Sedimentary System in the Zhuhai Formation in the South Subsag of Baiyun Sag,Pearl River Mouth Basin |
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| SHU LiangFeng,ZHANG XiangTao,ZHANG ZhongTao,ZHANG LiLi,LEI ShengLan,GAO ZhongLiang,HAN Xiao,YU Sa.Evolution of the Shelf-margin Delta Sedimentary System in the Zhuhai Formation in the South Subsag of Baiyun Sag,Pearl River Mouth Basin[J].Acta Sedimentologica Sinica,2022,40(3):825-837. |
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| Authors: | SHU LiangFeng ZHANG XiangTao ZHANG ZhongTao ZHANG LiLi LEI ShengLan GAO ZhongLiang HAN Xiao YU Sa |
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| Institution: | Shenzhen Branch of China National Offshore Oil Corporation Limited, Shenzhen, Guangdong 518054, China |
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| Abstract: | Shelf-margin deltas， as important petroleum reservoirs， were widely developed in the Upper Oligocene strata of the south subsag of Baiyun Sag in the Pearl River Mouth Basin. It is also a research hotspot of sedimentary and petroleum geology. Based on high-resolution three-dimensional seismic data， this paper examined the sedimentary structure in the third-order sequence and evolution of the shelf-margin deltas of the Zhuhai Formation in the south subsag of Baiyun Sag. The study revealed that the shelf-margin deltas have two provenances in the north and northwest and formed 4 consecutive delta complexes； each complex can be subdivided into 2–5 sets of delta frontal bodies by dissecting the delta front structure and superimposed styles， and they have sigmoid-tangential and S-shaped seismic reflections. The deltas have significant differences in the rate of delta progression and accumulation in different source supply systems. The shelf-margin deltas have three evolution stages including the initial formation stage， development stage， and stable stage. The initial formation stage occurred in the middle and late stages of the 4th member of the Zhuhai Formation， and deltas mainly experienced progradational clinoform growth in the vertical direction. On the plane， the delta area from the northern provenance was small， and the area from the northwestern provenances was relatively large. The development stage occurred in the 3rd member of the Zhuhai Formation； during the development stages， deltas experienced aggradational-progradational clinoform growth in the vertical direction. The thickness of the shelf margin deltas reached its maximum. The northern provenance developed a certain scale shelf-margin delta-deep water fan systems， and the northwestern provenance shelf-margin delta front developed a shelf belt sand ridge. The stable stage occurred in the 2nd and 1st members of the Zhuhai Formation and experienced progradational clinoform growth first followed by aggradational clinoform growth. The scale of the delta fronts were larger， and the slope channels and deep-water fans were the most developed. The formation and evolution of shelf-margin deltas were controlled by the differential sediment supplies of the dual provenance， the rising and falling relative sea level， and the relative stability of tectonic activity. Therefore， the shelf-margin deltas from the northern provenance and the corresponding deep-water slope sedimentary system are the most favorable exploration targets in the study area. |
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