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鄂尔多斯晚三叠世湖盆异重流沉积新发现

杨仁超 金之钧 孙冬胜 樊爱萍

杨仁超, 金之钧, 孙冬胜, 樊爱萍. 鄂尔多斯晚三叠世湖盆异重流沉积新发现[J]. 沉积学报, 2015, 33(1): 10-20. doi: 10.14027/j.cnki.cjxb.2015.01.002
引用本文: 杨仁超, 金之钧, 孙冬胜, 樊爱萍. 鄂尔多斯晚三叠世湖盆异重流沉积新发现[J]. 沉积学报, 2015, 33(1): 10-20. doi: 10.14027/j.cnki.cjxb.2015.01.002
YANG RenChao, JIN ZhiJun, SUN DongSheng, FAN AiPing. Discovery of Hyperpycnal Flow Deposits in the Late Triassic Lacustrine Ordos Basin[J]. Acta Sedimentologica Sinica, 2015, 33(1): 10-20. doi: 10.14027/j.cnki.cjxb.2015.01.002
Citation: YANG RenChao, JIN ZhiJun, SUN DongSheng, FAN AiPing. Discovery of Hyperpycnal Flow Deposits in the Late Triassic Lacustrine Ordos Basin[J]. Acta Sedimentologica Sinica, 2015, 33(1): 10-20. doi: 10.14027/j.cnki.cjxb.2015.01.002

鄂尔多斯晚三叠世湖盆异重流沉积新发现

doi: 10.14027/j.cnki.cjxb.2015.01.002
基金项目: 国家自然科学基金“鄂尔多斯盆地南部晚三叠世异重流沉积机制”(批准号:41372135)、国家科技重大专项“中西部重点碎屑岩领域油气富集规律与分布预测”(编号:2011ZX05002-006)”与山东科技大学科研创新团队计划(编号:2010KYTD103)联合资助
详细信息
    作者简介:

    杨仁超 男 1976年出生 博士后 副教授 沉积学与石油地质学 E-mail: yang100808@126.com

  • 中图分类号: P512.2;TE121.3

Discovery of Hyperpycnal Flow Deposits in the Late Triassic Lacustrine Ordos Basin

  • 摘要: 水下重力流沉积作为重要的油气储层,已成为当前学术研究和油气工业共同关注的焦点.在鄂尔多斯盆地南部延长组长7~长6油层组深湖相沉积中,发现一种不同于砂质碎屑流沉积和滑塌浊积岩的重力流成因砂岩.其沉积特征为一系列向上变粗的单元(逆粒序层)和向上变细的单元(正粒序层)成对出现;每一个粒序层组合内部的泥质含量变化(高—低—高)与粒度变化一致;上部正粒序层与下部逆粒序层之间可见层内微侵蚀界面;砂岩与灰黑色纯泥岩、深灰色粉砂质泥岩互层;粉砂质泥岩层内也表现出类似的粒度变化特征.通过岩芯观察和薄片鉴定,认为该岩石组合形成于晚三叠世深湖背景下的异重流(hyperpycnal flow)沉积.其沉积产物——hyperpycnite(异重岩?)以发育逆粒序和层内微侵蚀面而区别于其它浊积岩,逆粒序代表洪水增强期的产物,上部的正粒序层为洪水衰退期的沉积,逆粒序—正粒序的成对出现代表一次洪水异重流事件沉积旋回;层内微侵蚀面是洪峰期流速足以对同期先沉淀的逆粒序沉积层侵蚀造成的.鄂尔多斯盆地延长组异重岩的发现,不仅为探索陆相湖盆环境下的异重流沉积提供了一个范例,而且对于深水砂体成因研究、储层预测和油气勘探具有理论和现实意义.
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  • 收稿日期:  2013-11-08
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目录

    鄂尔多斯晚三叠世湖盆异重流沉积新发现

    doi: 10.14027/j.cnki.cjxb.2015.01.002
      基金项目:  国家自然科学基金“鄂尔多斯盆地南部晚三叠世异重流沉积机制”(批准号:41372135)、国家科技重大专项“中西部重点碎屑岩领域油气富集规律与分布预测”(编号:2011ZX05002-006)”与山东科技大学科研创新团队计划(编号:2010KYTD103)联合资助
      作者简介:

      杨仁超 男 1976年出生 博士后 副教授 沉积学与石油地质学 E-mail: yang100808@126.com

    • 中图分类号: P512.2;TE121.3

    摘要: 水下重力流沉积作为重要的油气储层,已成为当前学术研究和油气工业共同关注的焦点.在鄂尔多斯盆地南部延长组长7~长6油层组深湖相沉积中,发现一种不同于砂质碎屑流沉积和滑塌浊积岩的重力流成因砂岩.其沉积特征为一系列向上变粗的单元(逆粒序层)和向上变细的单元(正粒序层)成对出现;每一个粒序层组合内部的泥质含量变化(高—低—高)与粒度变化一致;上部正粒序层与下部逆粒序层之间可见层内微侵蚀界面;砂岩与灰黑色纯泥岩、深灰色粉砂质泥岩互层;粉砂质泥岩层内也表现出类似的粒度变化特征.通过岩芯观察和薄片鉴定,认为该岩石组合形成于晚三叠世深湖背景下的异重流(hyperpycnal flow)沉积.其沉积产物——hyperpycnite(异重岩?)以发育逆粒序和层内微侵蚀面而区别于其它浊积岩,逆粒序代表洪水增强期的产物,上部的正粒序层为洪水衰退期的沉积,逆粒序—正粒序的成对出现代表一次洪水异重流事件沉积旋回;层内微侵蚀面是洪峰期流速足以对同期先沉淀的逆粒序沉积层侵蚀造成的.鄂尔多斯盆地延长组异重岩的发现,不仅为探索陆相湖盆环境下的异重流沉积提供了一个范例,而且对于深水砂体成因研究、储层预测和油气勘探具有理论和现实意义.

    English Abstract

    杨仁超, 金之钧, 孙冬胜, 樊爱萍. 鄂尔多斯晚三叠世湖盆异重流沉积新发现[J]. 沉积学报, 2015, 33(1): 10-20. doi: 10.14027/j.cnki.cjxb.2015.01.002
    引用本文: 杨仁超, 金之钧, 孙冬胜, 樊爱萍. 鄂尔多斯晚三叠世湖盆异重流沉积新发现[J]. 沉积学报, 2015, 33(1): 10-20. doi: 10.14027/j.cnki.cjxb.2015.01.002
    YANG RenChao, JIN ZhiJun, SUN DongSheng, FAN AiPing. Discovery of Hyperpycnal Flow Deposits in the Late Triassic Lacustrine Ordos Basin[J]. Acta Sedimentologica Sinica, 2015, 33(1): 10-20. doi: 10.14027/j.cnki.cjxb.2015.01.002
    Citation: YANG RenChao, JIN ZhiJun, SUN DongSheng, FAN AiPing. Discovery of Hyperpycnal Flow Deposits in the Late Triassic Lacustrine Ordos Basin[J]. Acta Sedimentologica Sinica, 2015, 33(1): 10-20. doi: 10.14027/j.cnki.cjxb.2015.01.002
    参考文献 (65)

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