天文强迫下海平面变化对深水沉积体系的影响机制  

Influence mechanism of sea level change on deep-water sedimentary system under astronomical forcing

作　　者：徐恩泽 张尚锋[1,3] 王雅宁[1,3] 朱锐[1,3] 范东旭 张泽 XU Enze;ZHANG Shangfeng;WANG Yaning;ZHU Rui;FAN Dongxu;ZHANG Ze(School of Earth Sciences,Yangtze University,Wuhan 430100,China;South Oil Exploration and Development Co.,Ltd.,Haikou 570100,China;Key Laboratory of Oil and Gas Resources and Exploration Technology of Ministry of Education,Yangtzeu University,Wuhan 430100,China;School of Environment,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100 [2]南方石油勘探开发有限责任公司,海南海口570100 [3]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100 [4]中国地质大学(武汉)环境学院,湖北武汉430074

出　　处：《断块油气田》2025年第2期234-241,299,共9页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目“南海北部宽缓大陆架海平面变化及双坡折带层序地层模型”(41472098);中石油科技专项“DE深水油气勘探评价关键技术研究”(2024ZZ56)、“天然气水合物开采机理与技术研究”(2024DJ96)。

摘　　要：该研究旨在揭示天文强迫下海平面变化对深水沉积体系,尤其是砂体发育的影响机制。通过分析气候周期性波动对南海珠江口盆地深水沉积体系的影响,进一步探索海平面变化与深水扇体的响应关系,为深水油气储层预测提供科学依据。文中采用旋回地层学分析方法建立高分辨率绝对天文年代标尺,运用DYNOT,ρ1模型恢复海平面变化曲线,并结合高分辨率地震属性分析及钻井数据,对南海珠江口盆地渐新世深水沉积体系的砂体发育进行了定量化研究。研究结果表明:2.4 Myr的天文周期在控制海平面变化方面起到了关键作用,影响了主要砂体发育时期的形成;识别了6个主要砂体发育时期(约33.9,31.1,29.2,27.4,25.3,23.0 Ma),且在该时期识别了17个深水扇体。研究结果不仅揭示了天文强迫下气候-海平面-沉积体系的耦合关系,而且为深水油气储层预测提供了重要参考。The aim of this study is to reveal the influence mechanism of sea level change under astronomical forcings on the deep-water sedimentary systems,especially the development of sand bodies.By analyzing the influence of climatic periodic fluctuation on deep-water sedimentary system of Pearl River Mouth Basin of the South China Sea,the response relationship between sea level change and deep-water fans is further explored,which provides scientific basis for the prediction of deep-water oil and gas reservoirs.In this paper,the analysis method of cyclostratigraphy is used to establish a high-resolution absolute astronomical age scale.By using the DYNOT andρ1 model to recover the sea level change curve,combined with high-resolution seismic attribute analysis and drilling data,the sand body development of the Oligocene deep-water sedimentary system in the Pearl River Mouth Basin of the South China Sea is quantitatively studied.The results show that the 2.4 Myr astronomical cycle plays a key role in controlling the sea level change,influencing the formation of major sand-body development periods.Six major sand-body development stages(about 33.9,31.1,29.2,27.4,25.3,23.0 Ma)were identified,and 17 deep-water fans were identified during this period.The research results not only reveal the coupling relationship of climatic,sea level and sedimentary system under astronomical forcing,but also provide an important reference for reservoir prediction in deep-water oil and gas reservoirs.

关 键 词：旋回地层学 古气候 海平面变化 深水沉积体系 影响机制 南海 

分 类 号：TE121.3[石油与天然气工程—油气勘探]