| 陕北地区延长组标志层特征及形成机制 |
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| 引用本文： | 庞军刚,李文厚,陈全红.陕北地区延长组标志层特征及形成机制[J].地层学杂志,2010,34(2). |
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| 作者姓名： | 庞军刚 李文厚 陈全红 |
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| 作者单位： | 西北大学地质学系,大陆动力学国家重点实验室,陕西西安,710069;西安石油大学油气资源学院,陕西西安,710065;西北大学地质学系,大陆动力学国家重点实验室,陕西西安,710069;中国海洋石油研究中心,北京,10002 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）;长江学者和创新团队发展计划 |
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| 摘 要： | 运用传统沉积学方法及层序地层学理论,在大量的钻井、野外露头资料基础上,系统分析陕北地区延长组地层划分标志层的岩性、电性特征,表明区域性油页岩标志层形成于延长组5个3级层序的最大湖泛期,具有"凝缩段"的特征,而凝灰岩标志层为火山喷发物质。这些标志层受沉积相横向变化的影响,主要分布在深湖亚相,部分分布在浅湖亚相。在不同沉积相形成的标志层的岩性特征、电性特征及平面分布均有一定的差异。地层划分对比过程中可用标志层控制、邻井对比并参考厚度原则的方法来确保划分的合理性。
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| 关 键 词： | 标志层 层序地层 形成机制 延长组 三叠系 陕北地区 陕西 |
CHARACTERISTICS AND DEPOSITION OF MARKER BEDS IN THE YANCHANG FORMATION OF THE NORTHERN SHAANXI |
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| Abstract: | We applied traditional sedimentology and sequence stratigraphy methods in the study of a large volume of well log and outcrop data.The lithostratigraphic and well log characters of marker beds in the Yanchang Formation of the northern Shaanxi are described systematically.Regionally extensive oil shale is associated with the maximum flooding surfaces of five third order sequences in the Yanchang Formation,these floading surfaces are characterized as condensed sections,The marker beds are volcanic tuffs.The distribution of these marker beds are controlled by the depositional environment,and they are mainly found in deep lake sub-facies,with some in shallow sub-facies.There are certain differences in lithology and well log characteristics of these marker beds in different facies.These marker beds,together with well log data and stratum thickness data,can be used to facilitate stratigraphic correlation and subdivision. |
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| Keywords: | marker bed forming mechanism Yanchang Formation Triassic northern Shaanxi |
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