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世界地质 2024, 43(1) 47-55 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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| 基础地质 |
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珠江口盆地白云凹陷超深水区层序??沉积及古环境特征: 以 A1 井为例 |
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卫哲1,2 , 曾驿1,2 , 周小康1,2 , 易浩1,2 , 时翠1,2
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1. 中海石油 (中国) 有限公司 深圳分公司, 广东 深圳 518067;
2. 中海石油深海开发有限公司, 广东 深圳 518067 |
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摘要：
为系统认识珠江口盆地白云凹陷超深水区层序界面识别和沉积环境演变, 笔者采用白云凹陷已 钻 A1 井晚渐新统珠海组—早中新统珠江组碳酸盐岩层段微量元素和常量元素数据开展综合分析, 研究 表明: ①通过 Pb? Zn? Rb? Al 2O3 ? Fe2O3 ? Th / U 比值等参数的变化特征识别了 SB24. 80? SB23. 03 和 SB21. 00 共 3 个三级层序界面; ②利用 Sr/ Ba? V/ Ni? Sr/ Cu? Al 2O3 / MgO? MgO/ CaO 比值的变化证实 样品段以干热气候? 海平面相对上升的沉积环境为主; ③通过 V/ Cr? Ni / Co? V/ (V + Ni) 等比值表 明, A1 井碳酸盐岩主要发育在氧化环境的古海洋水体中, 水体较浅, 晚期水位上升趋向于贫氧环境, 直至 “淹死” 终止碳酸盐岩发育?
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关键词：
地球化学元素
层序界面
古环境
白云凹陷
珠江口盆地
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Sequence sedimentary and paleoenvironmental characteristics in ultra?deep water area of Baiyun Sag, Pearl River Mouth Basin: taking Well A1 as an example |
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WEI Zhe 1,2 , ZENG Yi 1,2 , ZHOU Xiaokang 1,2 , YI Hao 1,2 , SHI Cui 1,2 |
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1. Shenzhen Branch of CNOOC (China) Co., Ltd., Shenzhen 518064, Guangdong, China;
2. CNOOC Deepwater Development Ltd., Shenzhen 518064, Guangdong, China |
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Abstract:
To systematically understand the sequence boundary identification and sedimentary environment evolution in the ultra?deep water area of the Baiyun Sag, Pearl River Mouth Basin, the authors conducted a compre? hensive analysis using trace and major element data from the carbonate rock section of the Late Oligocene Zhuhai Formation to Early Miocene Zhujiang Formation of the drilled Well A1 in Baiyun Sag. The results show: ①Three third?order sequence boundaries of SB24. 80, SB23. 03 and SB21. 00 were identified through the variation charac? teristics of parameters such as concentrations of Pb, Zn, Rb, Al 2O3 , Fe2O3 , and Th / U ratio. ②Based on the var? iability of Sr/ Ba, V/ Ni, Sr/ Cu, Al 2O3 / MgO, and MgO/ CaO ratios, it is confirmed that the sample section deposi? ted mainly in a sedimentary environment characterized by arid climate and relative sea?level rise. ③Ratios of V/ Cr, Ni / Co, V/ (V + Ni) suggest that the carbonate rocks in Well A1 are mainly developed in ancient marine wa? ter bodies of oxidizing environments, with shallow water bodies. In the later stage, the water level tended to rise to?wards hypoxic conditions, and the development of carbonate rocks was terminated by “drowning”.
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Keywords:
geochemical elements
sequence boundary
paleoenvironment
Baiyun Sag
Pearl River Mouth Basin
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