| 四川盆地奥陶系十字铺组与宝塔组接触关系新认识 |
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| 引用本文： | 樊茹,卢远征,张学磊,张师本,段文哲,李鑫,邓胜徽.四川盆地奥陶系十字铺组与宝塔组接触关系新认识[J].地质学报,2013,87(3):321-329. |
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| 作者姓名： | 樊茹 卢远征 张学磊 张师本 段文哲 李鑫 邓胜徽 |
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| 作者单位： | 中国石油勘探开发研究院,中国石油勘探开发研究院,中国石油勘探开发研究院,中国石油勘探开发研究院;中国石油塔里木油田公司勘探开发研究院,中化石油勘探开发有限公司,中国石油勘探开发研究院,中国石油勘探开发研究院 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 内容提要：四川盆地奥陶系十字铺组和宝塔组自上世纪20年代命名以来，在地层学界一直被认为是连续沉积，整合接触。四川盆地东-南缘中-上奥陶统习水良村和武隆黄草两条剖面的牙形石生物地层与碳同位素地层学研究指示，十字铺组与宝塔组之间存在沉积间断，即二者并非整合接触关系。该不整合可与北美地区的M4/M5不整合面对比，二者可能是由桑比期早、晚期的海平面下降引发。与此时代相近的不整合在新疆巴楚地区、塔里木盆地亦有发现。由于十字铺组在四川盆地广泛分布于覆盖区，且岩性多以碳酸盐岩为主，因此不整合的发现将促使我们重新认识并评估该组的油气勘探潜力。
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| 关 键 词： | 四川盆地 奥陶系 十字铺组 宝塔组 接触关系 |
| 收稿时间： | 2012/5/18 0:00:00 |
| 修稿时间： | 2012/8/20 0:00:00 |
Recognition of the contact relationship between the Shihtzupu Formation and the Pagoda Formation in the Sichuan Basin |
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| Fan Ru,Lu Yuanzheng,Zhang Xuelei,Zhang Shiben,Duan Wenzhe,Li Xin and Deng Shenghui.Recognition of the contact relationship between the Shihtzupu Formation and the Pagoda Formation in the Sichuan Basin[J].Acta Geologica Sinica,2013,87(3):321-329. |
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| Authors: | Fan Ru Lu Yuanzheng Zhang Xuelei Zhang Shiben Duan Wenzhe Li Xin and Deng Shenghui |
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| Institution: | Research Institute of Petroleum Exploration & Development,Research Institute of Petroleum Exploration & Development,Research Institute of Petroleum Exploration & Development,Research Institute of Petroleum Exploration & Development;Research Institute of Exploration and Development, Tarim Oil field company,Sinochem Petroleum Exploration & Production Company, Limited,esearch Institute of Petroleum Exploration & Development,esearch Institute of Petroleum Exploration & Development |
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| Abstract: | Abstract: Since Shihtzupu and Pagoda formations of the middle-upper Ordovician System are named in 1920s, they had been considered to be conformable contact in the Sichuan Basin. In this study, conodont biostratigraphy and carbon isotope stratigraphy are researched in the middle-upper Ordovician in the Liangcun and Huangcao sections around the Sichuan Basin. Both biostratigraphic and chemostratigraphic results indicate a gap between the Shihtzupu and Pagoda formations. The discontinuity can be correlated with the M4/M5 sequence boundary which is a prominent unconformity in North America. Both of them probably result from the regression in the early and late Sandbian. There is also unconformity in the middle-upper Ordovician in Bachu area and Tarim Basin. The possible disconformity between the Shihtzupu Formation and Pagoda Formation is significant for our petroleum exploration in the Sichuan Basin. |
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| Keywords: | Sichuan Basin Ordovician System Shihtzupu Formation Pagoda Formation contact relationship |
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