东海盆地某油气田A井P层沉积体系研究 |
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引用本文: | 金艳,傅强.东海盆地某油气田A井P层沉积体系研究[J].海洋地质译丛,2013(4):19-23. |
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作者姓名: | 金艳 傅强 |
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作者单位: | [1]上海石油天然气有限公司,上海200041 [2]同济大学海洋与地球科学学院,上海200092 |
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摘 要: | 东海盆地某油气田A井钻遇古近系平湖组P层为一套灰绿色含砾细砂岩.对此层中的微量元素、古生物资料、粒度特征以及测井资料的分析表明:沉积物中的硼元素含量较低,Sr/Ba比值小于1,Fe/Mn比值远大于5,这些指标反映沉积水体为淡水;同时,Ni/Co比值大多数介于2.5~5之间,而V/Ni比值大于1,指示研究层位沉积于还原环境中.该层沉积物中,蕨类孢子含量极高,花粉组合以阔叶类木本为主,且含较多喜暖湿针叶类花粉,说明当时盆地周边区域气候大致相当于现代亚热带气候,较温暖且偏湿润.A井P层中,砾石具近源快速堆积特征,泥岩属较深水沉积,岩层粒度具浊积岩特征;结合空间岩性展布状况可以判断,P层沉积相属于温暖湿润气候下的淡水近岸水下扇相.
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关 键 词: | 东海盆地 平湖组 微量元素 孢粉 近岸水下扇相 |
Study on Sedimentary System of P Formation in Well A in Oil and Gas Field of East China Sea |
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Authors: | JIN Yan FU Qiang |
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Institution: | 2 ( 1. Shanghai Petroleum Co. Ltd., Shanghai 200041, China; 2. School of Ocean and Earth Sciences, Tong/i University, Shanghai 200092, China ) |
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Abstract: | Pinghu formation in Paleogene, consisting mainly of grayish green pebbly fine sandstone, was penetrated in A well in Xihu sag, East China Sea. Through analysis of trace elements, paleontological data, grain size characteristics and logging data, it is indicat- ed that the content of boron is low, Sr/Ba ratio is less than 1, and Fe/Mn ration is far higher than 5, indicating that the sediments were deposited in fresh water. Meanwhile, the Ni/Co ratio is between 2.5 - 5 and the V/Ni ratio is higher than 1, indicating that sedimen- tary environment was reducing environment. In the sediments, spores are quite abundant, while the pollen of broad-leaved trees and warm/humid-preferring conifers dominates the pollen assemblages, that suggests the the regional climate was close to modern sub- tropical climate, it was warm and quite humid then. In the P formation of A well, the gravels are characterized by proximal and fast accumulation; the mudstones are relatively deep water deposits. The grain sizes have typical turbidite characteristic. Combined with the spatial distribution pattern of different rocks, it can be determinated that P formation is nearshore subsea fan sedimentary facies. |
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Keywords: | East China Sea Basin Pinghu Fomation trace elements spore and pollen nearshore subaqueous fan |
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