石油勘探与开发 >

2018 , Vol. 45 >Issue 6: 936 - 946

DOI: https://doi.org/10.11698/PED.2018.06.02

油气勘探

鄂尔多斯盆地三叠系延长组长7段古沉积环境恢复及意义

  • 付金华 ,
  • 李士祥 ,
  • 徐黎明 ,
  • 牛小兵
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  • 1. 低渗透油气田勘探开发国家工程实验室,西安 710018;
    2. 中国石油长庆油田公司,西安 710018;
    3. 中国石油长庆油田公司勘探开发研究院,西安 710018
付金华（1963-）,男,湖北黄冈人,博士,中国石油长庆油田公司教授级高级工程师,主要从事石油天然气地质综合研究及油气勘探管理工作。地址：西安市未央区凤城四路长庆油田公司,邮政编码：710018. E-mail: fjh_cq@petrochina.com.cn

收稿日期: 2018-01-02

  修回日期: 2018-08-17

  网络出版日期: 2018-09-29

基金资助

国家重点基础研究发展计划（973项目）“淡水湖盆细粒沉积与富有机质页岩形成机理”（2014CB239003）; 国家科技重大专项“大型油气田及煤层气开发”（2016ZX05050,2017ZX05001002）

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Paleo-sedimentary environmental restoration and its significance of Chang 7 Member of Triassic Yanchang Formation in Ordos Basin, NW China

  • FU Jinhua ,
  • LI Shixiang ,
  • XU Liming ,
  • NIU Xiaobing
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  • 1. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China;
    2. PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    3. Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi'an 710018, China

Received date: 2018-01-02

  Revised date: 2018-08-17

  Online published: 2018-09-29

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摘要

通过对鄂尔多斯盆地三叠系延长组长7段周缘露头剖面及盆内钻井取心共289块样品进行元素地球化学测试分析,运用CaO/MgO•Al2O3、Sr/Cu、Rb/Sr、B元素含量、Rb/K2O、Th/U和V/（V+Ni）等一系列古温度、古盐度和古氧化环境判别指标,尝试恢复长7段沉积期的古气候、古盐度和古氧化还原条件等古环境特征。综合分析表明,长7段沉积期为古气温大于15 ℃的温暖潮湿的温带—亚热带气候,水体为陆相微咸水—淡水环境,沉积物是在强还原条件下形成的。适宜的温度、大面积深水湖盆、强还原性的古沉积环境,导致长73亚段有机质大量发育和富集保存,既形成了一套优质烃源岩,同时也为大规模页岩油的富集创造了有利条件。图7表1参43

关键词： 古气候; 古盐度; 古氧化还原条件; 元素地球化学; 古沉积环境; 长7段; 上三叠统; 鄂尔多斯盆地

本文引用格式

付金华 , 李士祥 , 徐黎明 , 牛小兵 . 鄂尔多斯盆地三叠系延长组长7段古沉积环境恢复及意义[J]. 石油勘探与开发, 2018 , 45(6) : 936 -946 . DOI: 10.11698/PED.2018.06.02

Abstract

Paleo-sedimentary environment of Chang 7 Member of Upper Triassic Yanchang Formation in Ordos Basin, including the paleoclimate, paleo-salinity and paleo-redox conditions were restored through geochemical element analysis of 289 samples collected from the outcrop sections around and wells drilled in the basin and using a series of identification indexes of paleo-climate, paleo-salinity and paleo-redox conditions, such as CaO/MgO•Al2O3, Sr/Cu, Rb/Sr, Rb/K2O, Th/U, V/(V+Ni), the content of element B tested from the mudstone. Comprehensive analysis shows that in sedimentary period of the Chang 7, the paleo-climate was warm temperate to subtropical climate with temperature higher than 15 ℃, the water body was continental brackish water to freshwater, and the sediments were deposited under strong reduction conditions. Suitable temperature, extensively deep lake basin and strongly reductive paleo-sedimentary environment led to the blooming, enrichment and preservation of organic matter in the submember Chang 73. As a result, a set of high-quality source rock was formed, laying material foundation for large-scale accumulation of shale oil.

Key words： paleo-climate; paleo-salinity; paleo-redox conditions; element geochemistry; paleo-sedimentary environment; Chang 7 Member; Upper Triassic; Ordos Basin

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