南海曾母盆地新生代沉积体系特征

摘要/Abstract

摘要： 曾母盆地作为一个拥有万亿立方米天然气地质储量的大气田，其沉积体系缺乏系统全面的研究，尤其是早期沉积环境是陆相还是海相一直存在争议。为了厘清曾母盆地沉积体系特征，为下一步油气勘探提供可靠依据，在总结分析大量前人研究成果的基础上，利用露头、钻井、地震及油田沉积相等资料，结合区域构造演化、物源供给特征和岩相古地理背景，对其新生代各个时期的沉积体系进行了系统分析。曾母盆地新生代共识别出河流相、三角洲相、海岸平原相、碳酸盐台地（生物礁）相、滨海相、浅海相和半深海相7种沉积相类型。曾母盆地新生代整体为海相环境，大型三角洲在盆地南部持续发育，碳酸盐台地（生物礁）和半深海沉积主要在坳陷期（中中新世—第四纪）发育，断坳期（渐新世—早中新世）基本不发育。由于中中新世受婆罗洲逆时针构造旋转的影响，曾母盆地物源方向发生改变，断坳期物源主要来自西南侧，坳陷期物源主要来自东南侧。

关键词: 曾母盆地, 新生代, 沉积体系, 沉积演化, 海相环境

Abstract: The Zengmu Basin is a large gas field with trillion-m3 scale gas reserves. Its sedimentary systems have not been systematically studied. There is a controversy about whether the basin was deposited in a continental environment or a marine environment during the early stage. In order to clarify the characteristics of sedimentary systems and to provide the reliable basis for the future oil and gas exploration in the Zengmu Basin, the previous research results were reviewed. Then, the Cenozoic sedimentary systems were analyzed using outcrops, wells, seismic and sedimentary facies data, as well as the regional tectonic evolution, material source characteristics and lithofacies paleogeographic background. As a result, 7 types of Cenozoic sedimentary facies were identified, including fluvial, delta, coastal plain, carbonate platform (organic reef), littoral, neritic and bathyal facies. It was the marine environment all over the basin during the Cenozoic. Large delta was constantly developed in the south of the basin, and the carbonate platform (organic reef) and bathyal facies deposits were mainly developed during the depression stage (the Middle Miocene-Quaternary), but seldom developed during the faulted depression stage (the Oligocene-Early Miocene). The provenance of the Zengmu Basin changed as a result of the counterclockwise rotation of Borneo during the Middle Miocene. The sources mainly came from the southwest during the faulted depression stage and from the southeast during the depression stage.

郭佳, 谢晓军, 刘世翔, 王一博, 宋双, 胡文博, 王龙, 廖计华. 南海曾母盆地新生代沉积体系特征[J]. 中国石油勘探, 2016, 21(4): 99-107.

Guo Jia, Xie Xiaojun, Liu Shixiang, Wang Yibo, Song Shuang, Hu Wenbo, Wang Long, Liao Jihua. Cenozoic sedimentary systems in Zengmu Basin, South China Sea[J]. China Petroleum Exploration, 2016, 21(4): 99-107.

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