Palaeo-water characteristics of the Member 1 of Paleogene Shahejie Formation in southern Nanpu sag, Bohai Bay Basin

doi:10.7605/gdlxb.2016.02.013

Abstract

Abstract: The palaeo-water characteristics of the Paleogene Shahejie Formation in Nanpu sag of Bohai Bay Basin was poorly studied. Taking the Member 1 of Shahejie Formation in southern Nanpu sag as an example,we studied the palaeosalinity and palaeo-water depth by many means. Based on special algae fossils and chemical element ratios including Sr/Ba and Rb/K,the palaeosalinity was interpreted as brackish water to semi￣saline water. The palaeoclimate was humid with fluctuation by analyzing Sr/Cu ratio and sporopollen fossils. The relative palaeo-water depth was reconstructed according to the change of Mn/Fe ratio,kerogen types,algae fossils and Tulotomoides. By synthetic analysis with the authigenic clay minerals,sedimentary structure and sedimentary facies,the palaeo-water depth interval was calculated by weighted average method. The results show that it was shallow water sedimentary environment with the quantitative palaeo-water depth ranging from 4,m to 15,m during the depositional period of the top of middle submember of Member 1 of Shahejie Formation in Nanpu sag. During the depositional period of lower submember of Member 1 of Shahejie Formation, the palaeo-water depth changed from 4 m to 30 m. It is indicated that the palaeosalinity and palaeo-water depth depended relatively on the palaeoclimate and ancient terrain background.

摘要： 渤海湾盆地南堡凹陷古近系沙河街组的古水体特征研究程度较低。以南堡凹陷南部为例,采用多种方法,分析了沙河街组一段沉积时期水体的古盐度和古水深。根据Sr/Ba值、Rb/K值和特殊藻类化石,认为其古盐度为微咸—半咸。通过Sr/Cu值和孢粉化石2种手段,恢复了研究区沙河街组一段沉积时期的古气候,认为其为潮湿气候但存在干湿波动。根据Mn/Fe值变化、干酪根类型和藻类化石以及似瘤田螺的发现,恢复了该时期的相对古水深,并结合自生黏土矿物、沉积构造和沉积相等,通过加权平均值的方法定量计算古水深,得出研究区沙一段中亚段顶部沉积时期水体较浅,为4~15,m,而沙一段下亚段沉积时期水体较深,为4~30,m。综合分析认为,南堡凹陷南部沙河街组一段沉积时期的古盐度和古水深在一定程度上取决于古气候条件和古地形背景。

关键词: 古盐度, 古气候, 古水深, 古近系, 渤海湾盆地

CLC Number:

TE121.3+1

Du Qingxiang,　Guo Shaobin　Shen Xiaoli　Cao Zhonghong　Zhang Xiaolong　Li Yuanshu. Palaeo-water characteristics of the Member 1 of Paleogene Shahejie Formation in southern Nanpu sag, Bohai Bay Basin[J]. JOPC, 2016, 18(2): 173-184.

杜庆祥,郭少斌,沈晓丽,曹中宏,张晓龙,李媛姝. 渤海湾盆地南堡凹陷南部古近系沙河街组一段古水体特征*[J]. 古地理学报, 2016, 18(2): 173-184.

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URL: http://www.gdlxb.cn/EN/10.7605/gdlxb.2016.02.013

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   2015年为《古地理学报》审稿的专家

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表1 2015年为《古地理学报》评审稿件的专家学者

序号	单位	审稿专家
1	北京大学	黄宝琦,王河锦,吴朝东,夏正楷,薛进庄
2	北京师范大学	方修琦
3	北京铀矿研究院	王一刚,张字龙
4	长江大学	何幼斌,胡明毅,余烨,张昌民
5	成都理工大学	黄思静,李凤杰,施泽进,伊海生,郑荣才
6	东北石油大学	孟元林,孙雨
7	复旦大学	杨煜达
8	福建师范大学	李志忠
9	核工业北京地质研究院	张字龙
10	吉林大学	刘招君,单玄龙
11	兰州大学	范育新,孙柏年
12	南京大学	胡修棉,林春明
13	山东大学	靳桂云
14	山东建筑大学	田洪水
15	上海交通大学	孙承兴
16	同济大学	蔡进功,范代读
17	西安石油大学	王起琮
18	西北大学	李红,李文厚,罗静兰,吴柏林
19	西南石油大学	谭秀成,田景春,周路
20	中国地质调查局	江新胜,牟传龙,王强
21	中国地质大学(北京)	陈岳龙,邓宏文,丁文龙,何登发,黄文辉,李胜利,梅冥相,王宏语,于炳松,周洪瑞
22	中国地质大学(武汉)	杜远生,龚一鸣
23	中国地质研究院	柳永清,刘成林,乔秀夫,苏德辰,张美良
24	中国地质震局	袁仁茂
25	中国科学院	陈代钊,储雪蕾,李忠,万世明,王守春,吴亚生,许冰,郑景云,朱井泉
26	中国石油大学(北京)	董艳蕾,纪友亮,姜振学,金振奎,李理,吴胜和,吴欣松,鲜本忠,钟大康,钟宁宁,周子勇,朱筱敏
27	中国石油大学(华东)	邱隆伟,余宽宏,袁静
28	中石油勘探开发研究院	董大忠,高志勇,贾进华,客伟利,李宏伟,钱一雄,沈安江,吴因业,袁选俊,朱如凯,张惠良
29	中国矿业大学(北京)	邵龙义
30	中国矿业大学(徐州)	郭英海
31	中海油研究总院	胡光义
32	中山大学	刘春莲,周永章
33	中石化勘探开发研究院	彭勇民
34	中石油四川油田分公司研究院	王一刚
35	浙江师范大学	朱丽东

        《古地理学报》编辑部
   2016年1月

[1]	Huang Yun, Liang Shu-Yi, Xia Yu, Li Yan-Ping, Gu Xin-Ping, Fu Xiao-Peng. Sedimentary filling characteristics and petroleum geologic significance of the Early Carboniferous in Dibei uplift,Junggar Basin [J]. JOPC, 2019, 21(4): 637-646.
[2]	Zheng Jian-Feng, Yuan Wen-Fang, Huang Li-Li, Pan Wen-Qing, Qiao Zhan-Feng, Yang Guo. Sedimentary facies model and its exploration significance of the Lower Cambrian Xiaoerblak Formation in Xiaoerblak area, Tarim Basin [J]. JOPC, 2019, 21(4): 589-602.
[3]	Liu Shu-Jun, Cao Ying-Chang, Liang Chao. Lithologic characteristics and sedimentary environment of fine-grained sedimentary rocks of the Paleogene in Dongying sag,Bohai Bay Basin [J]. JOPC, 2019, 21(3): 479-489.
[4]	Zhao Dongna, Zhu Xiaomin, Lin Jincheng, Dong Yanlei, Yang Chaoqiang,Wang Qingshuai. Sedimentary characteristics and evolution of transitional belt of the Paleogene Lingshui Formation in Ya13-1 Gasfield of Qiongdongnan Basin, South China Sea [J]. JOPC, 2014, 16(3): 385-400.
[5]	Dong Yanlei, Zhu Xiaomin, Geng Xiaojie, Luo Jiaqun, Liu Guilan, Jiang Qiang. Provenance analysis of the Paleogene Hetaoyuan Formation in southeastern Biyang Sag of Nanxiang Basin,Henan Province [J]. JOPC, 2014, 16(1): 115-124.

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