| 苏北淮安盐盆杨槐区块浦二段盐韵律特征及其古气候意义 |
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| 引用本文： | 张文淼,丁国生,于兴河,完颜祺琪,垢艳侠,吴子瑾,孙乐,付超.苏北淮安盐盆杨槐区块浦二段盐韵律特征及其古气候意义[J].现代地质,2019,33(2):370-378. |
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| 作者姓名： | 张文淼 丁国生 于兴河 完颜祺琪 垢艳侠 吴子瑾 孙乐 付超 |
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| 作者单位： | 1.中国地质大学(北京) 能源学院,北京 1000832.中国石油勘探开发研究院 廊坊分院,河北 廊坊 065007 |
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| 基金项目： | 国家科技重大专项“岩性油气藏砂砾岩储集体地质建模”(2017ZX05001-002-003) |
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| 摘 要： | 盐湖沉积因具有成盐多期性和连续完整性的特点,是恢复成盐期古环境的重要研究对象,形成的不同级次盐韵律记录了不同尺度周期下古气候的干湿变化。上白垩统浦口组是淮安盐盆的主要含盐层系,对含盐层段盐韵律的研究有助于恢复该地区成盐期的古气候特征。在对资料井A1井取心段岩心精细观察和岩样矿物成分分析的基础上,分析资料井岩性的垂向变化,对浦口组盐韵律特征进行识别并划分。根据盐韵律对古气候的指示作用研究成盐期区块短尺度气候周期下的古气候变化。将淮安盐盆杨槐区块浦口组划分出Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ级韵律,识别出完整的盐韵律组合,即泥岩—钙芒硝质盐岩—盐岩—钙芒硝质盐岩。含盐段中广泛发育暖温相矿物钙芒硝,指示气候特征为炎热的暖旱型。在Ⅳ级韵律尺度下建立了气候干湿性变化曲线,表明区块气候干湿性波动频繁,但仍以干旱为主,韵律厚度大致反映了气候波动频率大小。
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| 关 键 词： | 杨槐区块 浦二段 盐韵律 古气候 |
| 收稿时间： | 2018-06-07 |
| 修稿时间： | 2018-09-20 |
Salt Rhythm Characteristics and Paleoclimatic Significance of Pukou Formation (2~(nd) Member) in Yanghuai Section of Huai'an Salt Basin,Northern Jiangsu |
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| ZHANG Wenmiao,DING Guosheng,YU Xinghe,WANYAN Qiqi,KOU Yanxia,WU Zijin,SUN Le,FU Chao.Salt Rhythm Characteristics and Paleoclimatic Significance of Pukou Formation (2~(nd) Member) in Yanghuai Section of Huai'an Salt Basin,Northern Jiangsu[J].Geoscience——Journal of Graduate School,China University of Geosciences,2019,33(2):370-378. |
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| Authors: | ZHANG Wenmiao DING Guosheng YU Xinghe WANYAN Qiqi KOU Yanxia WU Zijin SUN Le FU Chao |
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| Institution: | 1. School of Energy Resources,China University of Geosciences, Beijing 100083,China2. Langfang Branch,PetroChina Research Institute of Petroleum Exploration & Development, Langfang,Hebei 065007,China |
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| Abstract: | Salt lake sediments, commonly characterized by its multi-stage formation and continuity, are important in paleoenvironment reconstruction. The salt rhythms of different scales show different paleoclimatic changes in their respective scale. The Pukou Formation is the main saliniferous sequence in the Huai’an basin, and studying the rhythms developed in the rock record can reveal the paleoclimatic characteristics. Based on core observation and mineral composition analysis, we have determined the salt rhythms and the vertical lithological variations. The paleoclimatic indications by the rhythms have revealed short-term paleoclimatic changes. The salt rhythms can be divided into five cycles, and each cycle is identified by a complete sequence of mudstone-glauberite-bearing salt rock-salt rock-glauberite-bearing salt rock. The extensive development of warm saline mineral (e.g.glauberite) indicates the paleoclimate was warm and arid. This study reconstructed the paleoclimate at IV-order rhythm, which was characterized by frequent arid-wet climatic fluctuations, despite dominated by arid climate. The thickness of rhythms generally reflects the fluctuation frequency. |
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| Keywords: | Yanghuai section Pukou Formation (2nd member) salt rhythm paleoclimate |
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