川南威远—泸州页岩气井区奥陶系顶部观音桥组岩相和沉积环境

梁萍萍, 郭伟, 王南, 赵文韬, 王红岩, 马譞, 李越. 2022. 川南威远—泸州页岩气井区奥陶系顶部观音桥组岩相和沉积环境. 地质科学, 57(1): 115-126. doi: 10.12017/dzkx.2022.007
引用本文: 梁萍萍, 郭伟, 王南, 赵文韬, 王红岩, 马譞, 李越. 2022. 川南威远—泸州页岩气井区奥陶系顶部观音桥组岩相和沉积环境. 地质科学, 57(1): 115-126. doi: 10.12017/dzkx.2022.007
Liang Pingping, Guo Wei, Wang Nan, Zhao Wentao, Wang Hongyan, Ma Xuan, Li Yue. 2022. Lithofacies and sedimentary environments of the uppermost Ordovician Kuanyinchiao Formation from the wells in Weiyuan-Luzhou, southern Sichuan. Chinese Journal of Geology, 57(1): 115-126. doi: 10.12017/dzkx.2022.007
Citation: Liang Pingping, Guo Wei, Wang Nan, Zhao Wentao, Wang Hongyan, Ma Xuan, Li Yue. 2022. Lithofacies and sedimentary environments of the uppermost Ordovician Kuanyinchiao Formation from the wells in Weiyuan-Luzhou, southern Sichuan. Chinese Journal of Geology, 57(1): 115-126. doi: 10.12017/dzkx.2022.007

川南威远—泸州页岩气井区奥陶系顶部观音桥组岩相和沉积环境

  • 基金项目:

    西南油气田分公司项目(编号:XNS25JS2020)和中国科学院战略性先导科技专项B类(编号:XDB26000000)资助。

详细信息
    作者简介:

    梁萍萍,女,1991年生,硕士,工程师,非常规油气地质专业。E-mail:liangpp69@petrochina.com.cn

    通讯作者: 郭伟,男,1973年生,博士,高级工程师,非常规油气地质专业。本文通讯作者。E-mail:pkuguowei69@petrochina.com.cn
  • 中图分类号: TE121.3;P534.42

Lithofacies and sedimentary environments of the uppermost Ordovician Kuanyinchiao Formation from the wells in Weiyuan-Luzhou, southern Sichuan

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  • 上扬子地区四川盆地南部威远—泸州地区上奥陶统凯迪阶五峰组和志留系底部兰多维列统龙马溪组黑色笔石页岩沉积于滞留缺氧海底且富含有机质,是页岩气的主产层位,介于五峰组和龙马溪组之间的奥陶系顶部赫南特阶观音桥组通常是含腕足类以及三叶虫的灰岩沉积,其化石组成是冈瓦纳冰川事件最盛期在低纬度陆表海区的产物,岩石学微相特征研究能进一步诠释当时海底沉积环境。本文根据威远地区的W2、W4H10井,泸州地区的L2井、L4井、L5井、L6井、L7井、L8井、L9井观音桥组微相鉴定识别生物多样性,除常见的Hirnantia腕足动物群、三叶虫Dalmanitina等壳相化石外,还出现海百合、腹足类Homotoma、双壳类、海绵动物碎片和虫管遗迹化石Chondrites(丛藻迹),其化石组成记录了该层位的生物多样性。观音桥组沉积时该区海底富氧环境有利于底栖动物生存,远岸区海底水动力弱,化石粒度偏细且部分化石破碎程度高,未见大量复体珊瑚和钙藻等典型暖水区化石,反映出远岸相观音桥组海底水温可能偏低。
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出版历程
收稿日期:  2021-06-17
修回日期:  2021-10-08

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