| 浊积岩和砂质碎屑流岩关键识别标志及辽河盆地岩心实例* |
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| 引用本文： | 杨棵,朱筱敏,刘宇,刘兴周,郭峰.浊积岩和砂质碎屑流岩关键识别标志及辽河盆地岩心实例*[J].古地理学报,2020,22(3):483-492. |
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| 作者姓名： | 杨棵 朱筱敏 刘宇 刘兴周 郭峰 |
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| 作者单位： | 1.中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;2.中国石油大学(北京)地球科学学院,北京 102249;3.中国石油辽河油田分公司,辽宁盘锦 124010 |
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| 基金项目： | *国家重大科技专项(编号:2017ZX05001-002-002)和国家自然科学基金项目(编号:41202078)联合资助 |
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| 摘 要： | 重力流是自然界中广泛存在的一种流体形式,不同学者基于不同切入点往往会提出多种重力流的划分方案。采用浊流和碎屑流的二分方案,对浊积岩和砂质碎屑流岩的沉积特征展开综述和探讨,旨在进一步概括这2类岩石的沉积特征,明确具有指示意义的最典型相标志。研究表明,在野外露头和钻井岩心中,可以通过以下典型特征鉴别浊积岩和砂质碎屑流岩: 砂岩内若发育以正粒序为特征的递变层理,则应该将其认定为浊积岩;若砂岩内发育泥岩撕裂屑、漂浮状泥砾或不含任何层理构造(块状砂岩),则应该将其认定为砂质碎屑流岩。这些特征是鉴别浊积岩和砂质碎屑流岩最可靠的标志。此外,变形层理、爬升波纹交错层理、波状层理、平行纹层、冲刷侵蚀界面、岩性突变界面和槽模等沉积构造也具有一定指示意义,出现这些特征时需要结合沉积背景、岩相的垂向组合关系和地球物理等资料进行综合判断。
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| 关 键 词： | 重力流 浊积岩 砂质碎屑流岩 相标志 辽河盆地 |
| 收稿时间： | 2020-03-09 |
Key signatures of turbidite and sandy debris and core examples in Liaohe Basin |
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| Yang Ke,Zhu Xiao-Min,Liu Yu,Liu Xing-Zhou,Guo Feng.Key signatures of turbidite and sandy debris and core examples in Liaohe Basin[J].Journal of Palaeogeography,2020,22(3):483-492. |
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| Authors: | Yang Ke Zhu Xiao-Min Liu Yu Liu Xing-Zhou Guo Feng |
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| Institution: | 1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;2.College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;3.PetroChina Liaohe Oilfield Company,Liaoning Panjin 124010, China |
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| Abstract: | Gravity flow is a widely-distributed fluid type in nature. Various classification schemes of gravity flow are proposed by different researchers from different viewpoints. The scheme of turbidity flow and debris flow is adopted in this paper. The sedimentary characteristics of turbidite and sandy debrite are summarized and discussed to clarify most typical facies marks of these two rock types. The study shows that turbidite and sandy debris can be identified by the following typical characteristics during the outcrop and core observation: If the graded bedding is developed in sandstone,it should be identified as turbidite;if the muddy rip-up clast or no bedding structure(massive sandstone)is developed in sandstone,it should be identified as sandy debris. These characteristics are the most reliable signatures to distinguish turbidite and sandy debris. In addition,some other sedimentary structures such as deformation bedding,climbing ripple cross bedding,wavy bedding,parallel bedding,scouring surface,lithologic abrupt interface,and flute cast also have certain indicative significance. It is necessary to make a comprehensive judgment based on the sedimentary background,vertical combination of lithofacies,geophysics and other materials when these characteristics are presented in the study. |
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| Keywords: | gravity flow turbidite sandy debris facies mark Liaohe Basin |
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