| 莺歌海盆地黄流组二段碎屑锆石年龄与储层物源分析 |
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| 引用本文： | 谢玉洪,童传新,裴健翔,刘平,梁新权,王策,周云,蒋英,温淑女,付建刚,余世花,向建华.莺歌海盆地黄流组二段碎屑锆石年龄与储层物源分析[J].大地构造与成矿学,2016(3):517-544. |
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| 作者姓名： | 谢玉洪 童传新 裴健翔 刘平 梁新权 王策 周云 蒋英 温淑女 付建刚 余世花 向建华 |
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| 作者单位： | 1. 中海石油 中国 有限公司湛江分公司,广东湛江,524057;2. 中国科学院广州地球化学研究所同位素地球化学国家重点实验室,广东广州,510640;3. 中国科学院广州地球化学研究所同位素地球化学国家重点实验室，广东广州 510640; 中国科学院大学，北京 100049 |
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| 基金项目： | 国家科技重大专项(2011ZX05023-004-11)，国家自然科学基金(41576040;40872080)联合资助。 |
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| 摘 要： | 莺歌海盆地位于昆嵩隆起和海南隆起之间的南海西北部海域,是发育在南海北部大陆架西区的新生代含油气盆地。黄流组二段作为优质的天然气储层,其物源特征一直是当前研究的重要课题。本文利用LA-ICP-MS定年技术对莺歌海盆地四个不同局部构造区的上中新统黄流组二段沉积岩中碎屑锆石进行了U-Pb同位素分析。结果显示,东方构造区(DF13)和海口构造区(HK29)年龄频谱相似,有40~34 Ma、154~139 Ma、245~241 Ma、416~394 Ma和2191~1772 Ma几个主要年龄峰或年龄区间,与区域上的几次构造事件密切相关。结合盆地周边区域地质特征,应用地震沉积学、重矿物和Sr-Nd同位素等资料,发现这两个构造区均以红河物源为主,但后者受盆地东侧海南隆起的物源影响较大。莲花构造区(L1X)年龄频谱相对简单,有247 Ma一个主要年龄峰,431 Ma、935 Ma和1851 Ma三个次要峰,缺少喜山期和燕山期锆石年龄,物源可能主要来自盆地西侧的昆嵩隆起;岭头构造区(LT11)有99 Ma和234 Ma两个主要年龄峰,157 Ma和939 Ma两个次要峰,其物源以海南隆起为主,同时有部分红河物源的加入。通过碎屑锆石年代学分析,对莺歌海盆地黄流组二段储层物源特征有了更清楚的认识,为今后莺歌海盆地天然气勘探提供重要的理论依据。
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| 关 键 词： | 碎屑锆石 物源分析 LA-ICP-MS锆石U-Pb定年 黄流组 莺歌海盆地 |
Detrital Zircon Ages and Reservoir Source of the Second Member of the Huangliu Formation in the Yinggehai Basin |
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| Abstract: | The Yinggehai Basin, located in the southwestern of the South China Sea between the Kontum and Hainan Uplifts, is an important Cenozoic petroliferous basin. As a high quality reservoir, the provenance of the second member of Huangliu Formation has been a key issue in the current study. U-Pb dating of the detrital zircon grains from four sedimentary rocks of the second member of the Huangliu Formation in four gas fields were carried out by using cathodoluminescence (CL) imaging and LA-ICP-MS analysis. The results show that the age spectrum of the Haikou and Dongfang oil and gas tectonic areas (HK29 and DF13, respectively) are similar with age peaks at 40–34 Ma, 154–139 Ma, 245–241 Ma, 416–394 Ma, and 2191–1772 Ma, which are consistent with the several tectonic events in the region. Combining with the geological features of the surrounding areas and the seismology, heavy minerals, and Sr-Nd isotopes data, we found that they have distinct source areas, both of the samples were mainly derived from Red River while HK29 also influenced by the Hainan Uplift. The age spectrum of the Lotus oil and gas tectonic area (L1X) is relative simple with major peak at 247 Ma and several subordinate peaks at 431 Ma, 935 Ma, and 1851 Ma. We infer that the provenance was mainly from the Kontum Uplift. The Lingtou oil and gas tectonic area (LT11) has two major age peaks at 99 Ma and 234 Ma, along with two subordinate age peaks at 157 Ma and 939 Ma. The mainly source area is the Hainan Uplift with small proportion of material from the Red River. The results will provide important theoretical basis for the gas and oil exploration in the future. |
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| Keywords: | detrital zircon provenance analysis LA-ICP-MS zircon U-Pb dating Huangliu Formation Yinggehai Basin |
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