双峰盆地晚中新世深水沉积体系发育特征与勘探前景

doi:10.11885/j.issn.1674-5086.2024.08.30.02

摘要/Abstract

摘要： 双峰盆地为琼东南盆地中央峡谷水道的沉积物卸载区，其深水沉积体系规模巨大。随着南海北部深水区勘探进程的加快，双峰盆地油气勘探前景日益受到关注。通过海平面升降、地震资料反射特征等综合分析，对双峰盆地晚中新世深水沉积体的发育特征与油气地质条件展开了系统研究。研究结果表明：双峰盆地深水沉积体主要发育于晚中新世，发育分支水道、水道复合体、水道天然堤复合体、朵叶体等深水沉积单元，深水沉积体分布面积达上万平方公里，为潜在的超大规模储层；同时，双峰盆地西部拗陷和北部拗陷具有较好的生储盖条件，为具有油气勘探潜力的优选区域。由于双峰盆地整体位于深水——超深水区，烃源岩品质好坏、生排烃规模大小以及勘探目标是否具有经济性等是该区油气勘探的不确定因素，该结果对双峰盆地的油气勘探远景分析及战略选区、选带具有重要指导意义。

关键词: 南海北部, 双峰盆地, 晚中新世, 中央峡谷水道, 深水沉积

Abstract: Shuangfeng Basin is the sediment unloading area of the central canyon of Qiongdongnan Basin, with a huge scale of deep-water sedimentary system. With the acceleration of exploration in the deep water area of the northern South China Sea, the oil and gas exploration prospects in the Shuangfeng Basin are increasingly receiving attention. A systematic study was conducted on the development characteristics and oil and gas geological conditions of the late Miocene deep-water sedimentary bodies in the Shuangfeng Basin through comprehensive analysis of sea level rise and fall, seismic data reflection characteristics, etc. The research results indicate that the deep-water sedimentary bodies in the Shuangfeng Basin were mainly developed in the Late Miocene, with branch channels, channel complexes, channel—levee complexes, lobe etc. The distribution area of deepwater sedimentary bodies reach ten thousands of square kilometers, making it a potential area for ultra large scale reservoirs. Meanwhile, the western and northern depressions of the Shuangfeng Basin have good conditions of source, reservoir, and cap rocks. Due to the Shuangfeng Basin located in the deep-water to ultra deep-water zone, the quality of source rocks, the scale of hydrocarbon generation and expulsion, and the economic viability of exploration targets are uncertain factors in oil and gas exploration in this area. The result has important guiding significance for the analysis of oil and gas exploration prospects, strategic selection of areas and zones in the Shuangfeng Basin.

Key words: northern South China Sea, Shuangfeng Basin, Late Miocene, central canyon, deepwater deposits

中图分类号:

TE122

杨志力, 吴佳男, 范国章, 李丽, 张远泽. 双峰盆地晚中新世深水沉积体系发育特征与勘探前景[J]. 西南石油大学学报(自然科学版), 2025, 47(6): 15-26.

YANG Zhili, WU Jia'nan, FAN Guozhang, LI Li, ZHANG Yuanze. Characteristics of Late Miocene Deepwater Sedimentary and the Exploration Prospect in the Shuangfeng Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(6): 15-26.

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