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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第41卷

期数:

2019年第03期

页码:

316-326

栏目:

基础地质与矿产地质

出版日期:

2019-05-15

文章信息/Info

Title:

Element Geochemical Characteristics of Datangpo Formation of Nanhua System in Shennongjia Area of Hubei, China

文章编号:

1672-6561(2019)03-0316-11

作者:

郑海峰¹; 宋换新^2*; 杨振瑞¹; 唐永²; 旷红伟³; 柳永清³

(1.长江大学 资源与环境学院,湖北 武汉 430100; 2.长江大学 非常规油气湖北省协同创新中心,湖北 武汉 430100; 3.中国地质科学院地质研究所,北京 100037)

Author(s):

ZHENG Hai-feng¹;  SONG Huan-xin^2*;  YANG Zhen-rui¹;  TANG Yong²;  KUANG Hong-wei³;  LIU Yong-qing³

(1. College of Resources and Environment, Yangtze University, Wuhan 430100, Hubei, China; 2. Hubei CooperativeInnovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan 430100, Hubei, China; 3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China)

关键词:

元素地球化学;  大塘坡组;  南华系;  沉积水体环境;  古气候;  古盐度;  油气勘探;  神农架地区

Keywords:

element geochemistry;  Datangpo Formation;  Nanhua System;  sedimentary water environment;  paleoclimate;  paleosalinity;  oil and gas exploration;  Shennongjia area

分类号:

P595

DOI:

-

文献标志码:

A

摘要:

湖北神农架地区南华系大塘坡组属于间冰期沉积,目前对其沉积地层及古环境等方面的认识有限。在神农架地区南华系大塘坡组野外调查的基础上,利用元素地球化学分析测试资料,系统研究了该地区大塘坡组古环境特征及其对油气勘探的意义。CaO/(CaO+Fe)、Sr/Ba、Rb/K、K/Na值表明神农架地区大塘坡组沉积水体盐度整体为中—低盐度,其中大九湖剖面沉积水体盐度比宋洛剖面沉积水体高。氧化-还原性敏感元素相关参数V/(V+Ni)、Ni/Co、Ce_anom值研究表明,神农架地区南华系大塘坡组沉积于弱氧化—弱还原水体。CIA、ICV、Sr/Cu、Sr/Ba、Rb/Sr、Mg/Ca值和Sr含量等研究表明,神农架地区大塘坡组沉积期属于温暖湿润气候环境。总有机碳(TOC)、古生物资料以及Cu和Ba含量综合分析表明神农架地区大塘坡组沉积期温暖湿润气候以及合适的水体条件,为藻类的大量繁殖提供了优越的环境,并为大塘坡组优质烃源岩的发育提供了充足的有机质来源。

Abstract:

Datangpo Formation of Nanhua System in Shennongjia area of Hubei belongs to interglacial deposit, and the understanding of its sedimentary strata and paleoenvironment is limited at present. Based on the field geological investigation of Datangpo Formation of Nanhua System in Shennongjia area, the paleoenvironmental characteristics of Datangpo Formation and their significance for oil and gas exploration in this area were systematically studied by using the data of element geochemistry analysis. The ratios of CaO/(CaO+Fe), Sr/Ba, Rb/K, K/Na indicate that the sedimentary water salinity of Datangpo Formation is low-medium, and the sedimentary water salinity in the Dajiuhu section is higher than that in the Songluo section. Based on the relevant parameters of oxidation-reduction sensitive elements including the ratios of V/(V+Ni)and Ni/Co, and Ce_anom, the results show that Datangpo Formation of Nanhua System in Shennongjia area deposits in a weak oxidation-weak reduction water environment. The CIA, ICV, ratios of Sr/Cu, Sr/Ba, Rb/Sr and Mg/Ca, and the content of Sr indicate that the paleoclimate of Datangpo Formation during the deposition period is a warm and humid climate. Comprehensive analyses of TOC, paleontology and the contents of Cu and Ba show that the warm and humid climate, and water conditions during the deposition period of Datangpo Formation are very suitable for the mass reproduction of aquatic algae, and provide sufficient organic matters for the high-quality source rocks of Datangpo Formation.

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备注/Memo

备注/Memo:

收稿日期:2019-01-27; 修回日期:2019-03-18 投稿网址:http://jese.chd.edu.cn/
基金项目:国家重点研发计划项目(2016YFC0601001); 国家自然科学基金项目(41502133,41472082); 中国地质调查局地质调查项目(DD20160120-01)
作者简介:郑海峰(1992-),男,湖北孝感人,工学硕士研究生,E-mail:1280416068@qq.com。
*通讯作者:宋换新(1980-),男,湖北武汉人,副教授,工学博士,E-mail:shx@yangtzeu.edu.cn。

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更新日期/Last Update: 2019-05-20