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古地理学报 ›› 2017, Vol. 19 ›› Issue (3): 457-468. doi: 10.7605/gdlxb.2017.03.035

• 岩相古地理学及沉积学 • 上一篇    下一篇

塔里木盆地塔河地区中下奥陶统鹰山组碳酸盐岩层系内幕不整合识别特征*

卫端1, 2, 高志前1, 2, 杨孝群1, 2, 孟苗苗1, 2, 陈跃3, 董振坤1, 2, 王珊珊1, 2   

  1. 1 中国地质大学(北京)能源学院,北京 100083;
    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,北京 100083;
    3 中国石化勘探开发研究院无锡实验地质研究所,江苏无锡 214151
  • 收稿日期:2016-10-23 修回日期:2017-02-24 出版日期:2017-06-01 发布日期:2017-06-01
  • 通讯作者: 高志前,男,1978年生,博士,教授,主要从事碳酸盐沉积学和层序地层学方面的教学和研究。E-mail: gzq@cugb.edu.cn。
  • 作者简介:卫端,男,1990年生,中国地质大学(北京)硕士研究生,研究方向为层序地层学和沉积学。通讯地址: 北京市海淀区学院路29号中国地质大学(北京)能源学院。E-mail: weiduancugb@qq.com。
  • 基金资助:
    *国家自然科学基金项目(编号: 41102087),国家重点基础研究发展计划项目(编号: 2012CB214802)和国家科技重大专项(编号: 2011ZX05005-002-010HZ,2011ZX05009-002)联合资助

Identification methods and features of unconformity within carbonate successions of the Lower-Middle Ordovician Yingshan Formation in Tahe area,Tarim Basin

Wei Duan1, 2, Gao Zhiqian1, 2, Yang Xiaoqun1, 2, Meng Miaomiao1, 2, Chen Yue3, Dong Zhenkun1, 2, Wang Shanshan1, 2   

  1. 1 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083;
    2 Ministry of Education Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism,China University of Geosciences(Beijing),Beijing 100083;
    3 Research Institute of Experimental Geology,CNSPC,Wuxi 214151,Jiangsu;
  • Received:2016-10-23 Revised:2017-02-24 Online:2017-06-01 Published:2017-06-01
  • Contact: Gao Zhiqian,born in 1978,doctor,is a professor in China University of Geosciences(Beijing). He is mainly engaged in the study of carbonate sedimentology and sequence stratigraphy. E-mail: gzq@cugb.edu.cn.
  • About author:Wei Duan,born in 1990,is a M.S. degree candidate in China University of Geosciences(Beijing). His research field is carbonate sedimentology and sequence stratigraphy. E-mail: weiduancugb@qq.com.About the corresponding author Gao Zhiqian,born in 1978,doctor,is a professor in China University of Geosciences(Beijing). He is mainly engaged in the study of carbonate sedimentology and sequence stratigraphy. E-mail: gzq@cugb.edu.cn.
  • Supported by:
    [Co-funded by the National Natural Science Foundation of China(No.41102087), the National 973 Program of China(No.2012CB214802) and National Science-Technology Major Project of China(Nos.2011ZX05005-002-010HZ,2011ZX05009-002)]

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摘要： 为论证T67界面性质并探索碳酸盐岩层系不整合的识别方法,文章综合利用柯坪—巴楚地区露头和塔河地区钻井、测井和地震资料,研究了塔里木盆地塔河地区中下奥陶统鹰山组内幕不整合面T67。在露头上, T67界面表现为岩相转换面,但在不同剖面的暴露强度存在差异。在地化数据上, T67不整合面之下碳酸盐岩地层碳氧同位素值出现明显偏负;Sc,Co,Ni,Ba,U,Sr等微量元素表现出同样的特点,而Li和V在T67界面之下富集。在自然伽马测井与自然伽马能谱测井曲线上, T67不整合面之下的鹰山组下段自然伽马测井曲线明显较界面之上的鹰山组上段齿化剧烈,经过滤波处理的Th/U曲线在T67界面处呈现出明显的低值。在地震剖面上,难以从地震同相轴反射终止现象中识别出T67界面,但“串珠”状反射沿T67不整合面发育,这些串珠状反射被解释为与喀斯特作用相关的岩溶洞穴。T67界面属于海平面相对下降形成的短暂暴露面(<1,Ma),其主要受控于海平面升降和古地貌,在塔河不同区域的暴露、剥蚀强度不同,强暴露区主要位于中东部,弱暴露区域主要位于西北部。T67不整合面对塔河地区鹰山组内幕碳酸盐岩储集层发育具有重要意义,既可为层间岩溶的发育提供条件,亦可与断裂构成连通体系为大气淡水提供通道,从而对塔河地区深部碳酸盐岩储集层起到积极的改造作用。

关键词: 塔里木盆地, 塔河地区, 奥陶系, 鹰山组, 不整合面

Abstract: This paper integrates outcrops,well log and seismic data to describe the features of unconformity T67 within the Yingshan Formation in Tahe area, Tarim Basin. The unconformity T67 is characterized by lithofacies transitional surface at outcrops. δ13C and δ18O values below the unconformity T67 are significantly more negative,the same as the trace elements of Sc,Co,Ni,Ba,U,and Sr. The contents of Li and V below the unconformity T67 are relatively high. The GR logs in the lower part of the Yingshan Formation are more variable and have higher values. The Th/U values amended by filtering method are low at the section of unconformity T67 . It is difficult to identify the unconformity T67 based on the phenomena of reflection termination such as truncations,onlap and toplap in seismic profile,but some “beads-like” reflection anomalies are found along the unconformity T67 surface. These “beads-like” reflections are interpreted to indicate karst-relate palaeo-caverns. The unconformity T67 results from a short-term exposure(<1,Ma)and is controlled by sea-level changes and the palaeogeomorphology. The exposure degree of the unconformity T67 is variable in Tahe area,with the largest in the middle-east part,and the lowest in the northwest part. The unconformity T67 has great importance for the formation of carbonate reservoirs in the Yingshan Formation. It not only can provide the geological background for the interlayer karst development,but also can connect the fracture system to provide channels for the meteoric water flowing.

Key words: Tarim Basin, Tahe area, Ordovician, Yingshan Formation, unconformity

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