东海椒江凹陷晚古新世物源变化
发布时间：2018-08-29 13:25
【摘要】：为深入分析椒江凹陷上古新统明月峰组物源,探索适用于海域的物源研究方法,对东海椒江凹陷的岩石组分、重矿物及碎屑锆石U-Pb定年等数据进行物源综合分析.结果显示,凹陷东部明月峰组上段和下段的物源发生了改变,其下段物源主要来自凹陷东部的海礁隆起,以过渡弧-切割弧环境的酸性侵入岩为主,主要源岩时代为183~209Ma,有少量变质岩及其他中生代火成岩贡献;至明月峰组上段沉积期,物源以过渡弧环境下的酸性喷出岩及侵入岩为主,碎屑锆石年龄集中于106~116Ma,与围区物源特征基本相同;结合沉积体系演化分析,表明整个椒江凹陷的物源来自西部的浙闽隆起区.研究区物源变化是构造、沉积环境在晚古新世发生剧变的结果,这种物源变化对该区的盖层发育及对油气层封盖能力产生了较大影响.
[Abstract]:In order to deeply analyze the provenance of the Minyuefeng formation of the Upper Paleocene in Jiaojiang Sag, and to explore the research methods suitable for the sea area, the U-Pb dating data of rock components, heavy minerals and detrital zircons in the Jiaojiang sag of the East China Sea are comprehensively analyzed. The results show that the provenance of the upper and lower members of the Mingyuefeng formation in the eastern part of the sag has changed. The material source of the lower segment is mainly from the sea reef uplift in the eastern part of the sag, and the acidic intrusive rocks in the transitional arc-cutting arc environment are the main source. The main source rocks were 183N209Ma, with a small amount of metamorphic rocks and other Mesozoic igneous rocks, and during the deposition period of the upper member of the Mingyuefeng formation, the main provenances were acidic exhalation rocks and intrusive rocks in the transitional arc environment. The detrital zircon age is mainly at 106 ~ 116 Ma, which is basically the same as that of the surrounding area, and combined with the evolution analysis of sedimentary system, it is shown that the source of the whole Jiaojiang sag comes from the Zhejiang and Fujian uplift in the west of China. The change of provenance in the study area is a result of tectonic and depositional changes in the late Paleocene, which have a great influence on the development of the caprock and the sealing ability of the oil and gas reservoirs in the study area.
【作者单位】： 同济大学海洋地质国家重点实验室;中海石油(中国)有限公司上海分公司;
【分类号】：P534.612;P618.13
，
本文编号：2211338
[Abstract]:In order to deeply analyze the provenance of the Minyuefeng formation of the Upper Paleocene in Jiaojiang Sag, and to explore the research methods suitable for the sea area, the U-Pb dating data of rock components, heavy minerals and detrital zircons in the Jiaojiang sag of the East China Sea are comprehensively analyzed. The results show that the provenance of the upper and lower members of the Mingyuefeng formation in the eastern part of the sag has changed. The material source of the lower segment is mainly from the sea reef uplift in the eastern part of the sag, and the acidic intrusive rocks in the transitional arc-cutting arc environment are the main source. The main source rocks were 183N209Ma, with a small amount of metamorphic rocks and other Mesozoic igneous rocks, and during the deposition period of the upper member of the Mingyuefeng formation, the main provenances were acidic exhalation rocks and intrusive rocks in the transitional arc environment. The detrital zircon age is mainly at 106 ~ 116 Ma, which is basically the same as that of the surrounding area, and combined with the evolution analysis of sedimentary system, it is shown that the source of the whole Jiaojiang sag comes from the Zhejiang and Fujian uplift in the west of China. The change of provenance in the study area is a result of tectonic and depositional changes in the late Paleocene, which have a great influence on the development of the caprock and the sealing ability of the oil and gas reservoirs in the study area.
【作者单位】： 同济大学海洋地质国家重点实验室;中海石油(中国)有限公司上海分公司;
【分类号】：P534.612;P618.13
，
本文编号：2211338
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2211338.html
