地学前缘 ›› 2018, Vol. 25 ›› Issue (4): 176-184.DOI: 10.13745/j.esf.yx.2017-10-2

• 盆地与资源 • 上一篇    下一篇

早古近纪极热时期古气候演化分析：以东营凹陷为例

雷华蕊，姜在兴，周红科   

  1. 1. 中国地质大学(北京) 能源学院, 北京 100083
    2. 海相储层演化与油气富集机理教育部重点实验室, 北京 100083
    3. 国土资源部页岩气资源战略评价重点实验室, 北京 100083
    4. 中国石化股份有限公司 胜利油田分公司海洋采油厂, 山东 东营 257237
  • 收稿日期:2017-08-04 修回日期:2017-10-09 出版日期:2018-07-15 发布日期:2018-07-15
  • 作者简介:雷华蕊(1994—)，女，硕士研究生，沉积学专业，主要从事沉积学与古气候学研究。E-mail: leihuarui@cugb.edu.cn
  • 基金资助:
    “十三五”国家科技重大专项(2017ZX05009-002)；国家自然科学基金项目(41772090)

Analysis of paleoclimate evolution of the hyperthermal period in the early Paleogene: taking the Dongying depression as an example.

LEI Huarui,JIANG Zaixing,ZHOU Hongke   

  1. 1. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
    2. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, Beijing 100083, China
    3. Key Laboratory Strategy Evaluation for Shale Gas, Ministry of Land and Resources, Beijing 100083, China
    4. Offshore Oil Extraction Factory, Shengli Oilfield Company of China Petroleum and Chemical Corporation, Dongying 257237, China
  • Received:2017-08-04 Revised:2017-10-09 Online:2018-07-15 Published:2018-07-15

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摘要： 早古近纪时期全球范围内出现长期的极热气候。为进一步揭示早古近纪时期陆相湖盆的古气候演化及其对湖盆沉积体系的控制作用，本文以东营凹陷孔一下—沙三下亚段为研究对象，以化石孢粉组合分析为主要手段，系统分析了东营凹陷早古近纪时期的古气候演化进程。本次研究选用23种具统计价值的化石孢粉属种，依据气候参数MAT、CMT和PER对孢粉的气候指示意义进行量化处理，将化石孢粉类型划分为喜热组、喜温组、广温耐寒组、耐旱组、喜湿组5个大类。分别参照温度指标TI和湿度指标HI的变化趋势，将东营凹陷早古近纪的温度演化进程划分为持续极热期、温热交替期、持续温暖期三个阶段，将其湿度演化进程划分为干湿交替期、持续干旱期、干湿交替期和持续湿润期4个阶段，指出湿度演化相对于温度演化存在明显的滞后效应，且在早古近纪极热时期湿度演化的滞后性尤为明显。本研究确定了东营凹陷早古近纪持续极热期的起止时间范围为53.89~47.48 Ma，持续时间达6.41 Ma。通过标定古近纪全球范围内的三期热气候事件在东营凹陷的对应层位，确定了ETM2、EECO事件对东营凹陷早古近纪持续极热气候的重要贡献。同时将古气候分析与岩相分析相结合，阐明古气候条件对盆地内沉积岩及其组合的控制作用。

关键词: 古近纪, 古气候演化, 化石孢粉, 热气候事件, 东营凹陷

Abstract: There is a prolonged global hyperthermal period in the early Paleogene. Based on the analysis of fossil sporopollen assemblages, from the lower first submember of the Kongdian Formation to the lower third submember of the Shahejie Formation in the Dongying Depression, we systematically analyzed the paleoclimate evolution process of the Dongying Depression during the early Paleogene. We selected 23 kinds of fossil sporopollen species with statistical significance, and quantitatively classified these species into 5 categories (thermophilic, mesothermophilous, coldtolerant, xerophytic and hygrophytic groups) on the basis of three climate parameters: MAT, CMT and PER. According to the temperature index (TI) variation trend, the temperature evolution process of the Dongying Depression during the early Paleogene can be divided into three stages: continuous hot, warmhot alternation and continuous warm periods. Accordingly, the humidity evolution process can be divided into four stages: droughtpluvial alternation, continuous drought, second droughtpluvial alternation and continuous pluvial periods in terms of the humidity index (HI) variation. There were obvious hysteresis effects in the humidity evolution relative to temperature evolution in this prolonged hyperthermal period that went on from 53.89 to 47.48 Ma, with a total duration now estimated to be 6.41 Ma. Through identification of the specific strata corresponding to three worldwide greenhouse warming events in the Paleogene in the Dongying Depression, the pivotal effect of the ETM2 and EECO events on the hyperthermal period in the Dongying Depression is confirmed. In addition, by combining paleoclimate and lithofacies analyses, the control of paleoclimate over sedimentary system in the lacustrine basin is clarified.

Key words:  Paleogene, paleoclimate evolution, fossil sporopollen, warming climatic events, Dongying Depression

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