| 上扬子地区五峰组-龙马溪组页岩层序地层及演化模式 |
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| 引用本文： | 郭旭升.上扬子地区五峰组-龙马溪组页岩层序地层及演化模式[J].地球科学,2017,42(7):1069-1082. |
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| 作者姓名： | 郭旭升 |
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| 作者单位： | 中国石化勘探分公司, 四川成都 610041 |
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| 基金项目： | 中国石油化工股份有限公司基础研究项目P15074 |
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| 摘 要： | 学者们在页岩层序划分与构成等方面还存在较大分歧；其次，现有研究中针对页岩非均质性在层序格架内的变化特征及成因规律方面亦有不足.五峰组-龙马溪组页岩是上扬子地区重要的页岩气勘探层位之一，通过钻井岩心、露头剖面、常规测井、能谱测井和地球化学参数等资料，对上奥陶统五峰组-下志留统龙马溪组黑色页岩层序地层学进行了定量分析.在五峰组-龙马溪组识别出3个三级层序，其中五峰组为一个三级层序，进一步划分出海侵体系域（五峰组下部黑色页岩）和高位体系域（五峰组上部观音桥段）；龙马溪组一段作为一个三级层序，进一步划分出海侵体系域、早期高位和晚期高位体系域；龙马溪组二段和三段为一个三级层序，进一步划分出低位体系域、海侵体系域和高位体系域.以不同体系域为单元分析了五峰组-龙马溪组层序发育与沉积环境特征，揭示了各体系域内古生产力与水体氧化还原条件对有机质富集的控制机理，总结并提出了系统的五峰组-龙马溪组黑色页岩层序地层垂向演化模式.
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| 关 键 词： | 五峰组 龙马溪组 页岩 层序地层 有机质 沉积演化 石油地质 |
| 收稿时间： | 2016-12-08 |
Sequence Stratigraphy and Evolution Model of the Wufeng-Longmaxi Shale in the Upper Yangtze Area |
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| Abstract: | Shale sequence division and composition remain highly controversial, and the existing research on the characteristics and genesis of sequence framework is inadequate. The Wufeng-Longmaxi Formation Shale is one of the most important horizons of shale gas exploration in the Yangtze region. On the basis of research on well-core, outcrop, conventional log, a spectral gamma-ray log, geochemical parameters and other information are used for quantitative sequence stratigraphy analysis of black shale in the upper Ordovician Wufeng Formation to the lower Silurian Longmaxi Formation. Three third-order sequences are divided based on the recognition of four third-order boundaries. The Wufeng Formation is equivalent to a third-order sequence and is subdivided into a transgressive system tract (TST) (black shale of lower Wufeng Formation) and a highstand system tract (HST) (Guanyinqiao member of upper Wufeng Formation). the first member of Longmaxi Formation is equivalent to a third-order sequence and is subdivided into a TST, an early highstand system tract (EHST) and a late highstand system tract (LHST); the second member and third member of Longmaxi Formation are combined to be one third-order sequence and is subdivided into a lowstand system tract (LST), a TST and a HST. Sequence development and sedimentary environment characteristics are analyzed within each system tract unit.TOC is correlated to V/Cr and EF-Ni differently within different system tract units, suggesting paleoproductivity and water redox condition in different system tract units have different effect on the enrichment of organic matter in the studied shale. Based on the changes of depositional processes and water column conditions, we develop a depositional model to interpret the evolution of depositional environments of the Wufeng-Longmaxi Formation. |
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