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| 基金项目：“十三五”国家科技重大专项 (2016ZX05050006)、西安石油大学研究生创新与实践能力培养计划项目（YCS22112053） |
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| 摘要： |
| 根据大量的钻探、测井、露头数据，对鄂尔多斯盆地上古生界标志层的岩电特征、层序地层意义及形成的沉积环境进行研究。结果表明：研究区主要发育灰岩、砂岩、泥岩及煤层标志层，依据层序界面的特点将研究区上古生界划分为5个二级层序、12个三级层序，其中SQ1—SQ5属于海相地层层序，SQ6—SQ12为陆相层序。鄂尔多斯盆地上古生界总体上经历了海相—海陆过渡相—陆相的沉积演化过程，标志层受沉积相横向变化的影响，主要形成于三角洲、辫状河三角洲、河流、湖泊、障壁海岸以及浅海陆棚沉积体系。在划分地层及地层对比过程中，可通过控制标志层、对比相邻井、参考厚度变化等，合理、准确地划分地层。 |
| 关键词：上古生界 标志层 层序地层 形成机制 鄂尔多斯盆地 |
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| Abstract: |
| Lithology, electrical characteristics, sequence stratigraphic significance and sedimentary environment of Upper Paleozoic marker layers in the Ordos Basin have been researched based on data of drilling, logging and outcrop. There are main marker layers of limestone, sandstone, mudstone and coal bed in the study area. According to characteristics of sequence interfaces, Upper Paleozoic strata in the study area can be divided into 5 second-order sequences and 12 third-order sequences. SQ1-SQ5 fall into marine stratigraphic sequence, and SQ6-SQ12 fall into continental sequence. The Upper Paleozoic in the Ordos Basin has undergone a sedimentary evolution from marine facies to marine-continental transitional facies to continental facies in general. Marker layers are influenced by lateral changes of sedimentary facies, and mainly formed in the deltas, braided fluvial deltas, rivers, lakes, barrier coasts and shallow sea shelf sedimentary systems. In the process of stratigraphic division and correlation, strata can be reasonably and accurately divided with referenece to marker layers, adjacent wells and thickness changes, etc. |
| Keywords:Upper Paleozoic marker bed sequence stratigraphy formation mechanism Ordos Basin |
| 赵欣，庞军刚，赵琳雁，等.鄂尔多斯盆地上古生界标志层特征及形成机制[J].地质学刊,2024,48(1):49-58 |
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