贵州晴隆地区龙潭组沉积环境与富有机质页岩展布特征
投稿时间:2018-07-11  修订日期:2018-07-11  点此下载全文
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作者单位E-mail
陈榕 中国地质调查局油气资源调查中心 akihisa@qq.com 
张子亚 中国地质调查局油气资源调查中心  
贺敬博 自然资源部  
中文摘要:在野外剖面测量、老井复查的基础上,研究了晴隆地区龙潭组沉积环境,划分了黔西晴隆地区上二叠统龙潭组层序,绘制了晴隆地区龙潭组的连井剖面图和沉积相图。在晚二叠世龙潭组沉积期间,晴隆地区以机械-化学沉积为主,沉积体系为碳酸盐缓坡-平台-陆棚-斜坡-深水盆地。在龙潭组早期,主要沉积物为泥质沉积物和生物沉积物,主要沉积环境为三角洲前缘和前三角洲,深水沉积位于晴隆县北部。龙潭组中期,沙质沉积占主导,泥质沉积位于晴隆-兴仁一带。龙潭组晚期,晴隆地区以泥质和生物沉积为主,台地环境进一步扩大,富有机质页岩分布面积减少。晴隆地区有机质丰富的页岩分布广泛,其中晴隆北部和兴义地区龙潭组有机质页岩厚度较大。
中文关键词:二叠系  龙潭组  沉积环境  富有机质页岩。
 
Sedimentary Environment and Distribution Characteristics of Organic-Rich Shale in the Longtan Formation in Qinglong Area, Guizhou
Abstract:Based on the study of field and well data, the sequence of the Upper Permian Longtan Formation in the Qinglong area of western Guizhou were divided, and the well profile and sedimentary facies maps of Longtan Formation in the Qinglong area were depicted. During the deposition of the Late Permian Longtan Formation, the Qinglong area was dominated by mechanical-chemical deposition, and the sedimentary system was carbonate mild—sloped platform—land shed—slope-deepwater basin. In the early period of the Longtan Formation, the dominate sediment was argillaceous deposits and biosediments. The main depositional environments were delta front and pre-delta, and the deep-water sediments were located in the northern Qinglong area. In the middle period of the Longtan Formation, the main sediments was sandy sediments, and the muddy sediments are located in the Qinglong-Xingren area. In the late period of the Longtan Formation, the Qinglong area was dominated by argillaceous deposits and biosediments. The platform phase was further expanded and the area of organic-rich shale reduced. The organic-rich shale in the Qinglong area is wide distributed. The thickness of the organic-rich shale in the Longtan Formation in the northern part of Qinglong-Xingyi area.
keywords:Upper  Permian, Longtan  formation, sedimentary  environment, ogarnic-rich  shale.
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