张宸嘉;樊太亮;高志前;卫端;吴俊;

• 1:中国地质大学(北京)能源学院

• 2:中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室

摘要(Abstract)：

采用野外露头观察,薄片分析,主、微量元素测试及碳氧同位素测试等方法,结合层序地层学理论,以塔里木盆地柯坪地区肖尔布拉克剖面为例,分析寒武系中统—上统T81不整合面识别特征及地质意义。结果表明:在露头上,T81界面表现为岩相转换面,界面上发育中厚层状藻砂屑白云岩,界面下可见溶塌角砾,岩性为泥晶灰岩—中厚层白云岩—含叠层石藻白云岩的有序叠加。Ce、La、Al、Fe、Si等质量分数在界面处明显增大,即惰性元素相对富集;Cl的质量分数在界面上突减,反映界面下盐度较大;Sr/Ba和Mg/Ca变小,反映水体变浅;δ13 C在界面附近减小,界面下δ13 C较大,δ18 O明显降低,指示海平面下降造成短期暴露,且界面下的阿瓦塔格组沉积水介质盐度较高,还原条件下富δ12 C的有机质快速埋藏。T81界面下U、Th、K质量分数增加,GR曲线值较大,反映界面下泥质含量较大,界面上沉积环境发生变化,界面存在陆上短期暴露。地震剖面上可见顶超、前积特征,代表沉积间断的发育。T81界面属于Ⅱ级层序界面,在全盆地范围内发育,主要表现为同沉积暴露不整合、平行不整合、构造—侵蚀不整合、多期叠加不整合。界面上、下发育两套性质不同的断裂体系,沉积环境由缓坡型蒸发台地转变为镶边型局限台地。该研究结果为塔里木盆地寒武系沉积环境分析、储盖组合预测提供参考。

关键词(KeyWords)：不整合面;碳酸盐岩;寒武系;地球化学测试;肖尔布拉克剖面;塔里木盆地

Abstract:

Keywords:

基金项目(Foundation):国家科技重大专项(2017ZX05005-002-003,2017ZX05009-002);; 国家自然科学基金项目(51574208);; 中国科学院战略先导项目(XDA14010201-02)

作者(Author):张宸嘉;樊太亮;高志前;卫端;吴俊;

Email:

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