| 海相页岩综合层序地层划分及垂向分布特征——以川东南地区五峰组—龙马溪组为例 |
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| 引用本文： | 王冠平,朱彤,王红亮,吴靖,杜伟,冯动军,王濡岳.海相页岩综合层序地层划分及垂向分布特征——以川东南地区五峰组—龙马溪组为例[J].沉积学报,2019,37(2):330-344. |
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| 作者姓名： | 王冠平 朱彤 王红亮 吴靖 杜伟 冯动军 王濡岳 |
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| 作者单位： | 中国地质大学(北京)能源学院,北京 100083;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;中国地质大学(北京)页岩气勘查与评价国土资源部重点实验室,北京 100083;中国石油化工股份有限公司石油勘探开发研究院,北京,100083 |
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| 基金项目： | 中央高校基本科研业务费专项资金资助项目（2652017323）；中石化科技部技术开发（委托）项目（P16043） |
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| 摘 要： | 为探讨海相页岩中层序边界的识别、层序划分以及垂向上的演变特征,并给页岩中标准化层序地层的研究以及页岩气的勘探开发提供参考,以川东南地区上奥陶统五峰组—下志留统龙马溪组黑色富有机质海相页岩为例,综合利用野外剖面、岩芯、岩石薄片、古生物化石、测井、地球化学资料,结合层序地层学理论对海相页岩进行层序界面的识别和层序的划分。研究建立了以岩性界面直观反映物理特征,以测井反映地层叠加样式,以古生物笔石限定时间概念,以地球化学参数TH/U反映氧化还原环境和TOC反映有机质旋回性的海相页岩多参数层序边界识别方法;进而分析了垂向的层序发育特征以及连井层序特征,明确了五峰组—龙马溪组龙一段先后经历了三次较大规模的海侵—海退旋回,划分出3个三级层序和7个体系域;探讨了海退—海侵事件以及冰期气候对相对海平面升降的控制作用,建立了在冰期气候、古陆抬升、上升洋流以及浊流等影响因素下以体系域为单元海侵—海退的海相页岩垂向层序演化模式;体系域SQ1-TST、SQ2-TST以及SQ2-EHST为有机质富集的重点层位,SQ3-TST为次一级的有机质富集层位。
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| 关 键 词： | 海相页岩 五峰组-龙马溪组 层序地层 层序界面识别 演化模式 |
| 收稿时间： | 2018-06-06 |
Integrated Sequence Stratigraphic Division and Vertical Distribution Characteristics of Marine Shale: A case study of the Wufeng Formation-Longmaxi Formation in southeastern Sichuan Basin |
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| WANG GuanPing,ZHU Tong,WANG HongLiang,WU Jing,DU Wei,FENG DongJun,WANG RuYue.Integrated Sequence Stratigraphic Division and Vertical Distribution Characteristics of Marine Shale: A case study of the Wufeng Formation-Longmaxi Formation in southeastern Sichuan Basin[J].Acta Sedimentologica Sinica,2019,37(2):330-344. |
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| Authors: | WANG GuanPing ZHU Tong WANG HongLiang WU Jing DU Wei FENG DongJun WANG RuYue |
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| Institution: | (School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism(Ministry of Education),China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory for Shale Gas Exploration and Assessment(Ministry of Land Resources),China University of Geosciences(Beijing),Beijing 100083,China;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China) |
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| Abstract: | In order to explore the identification of the sequence boundary, sequence division, and vertical evolution characteristics of marine shales, and to provide a reference for the study of standardized sequence stratigraphy in shale, as well as the exploration and development of shale gas, we take the Wufeng Formation-Longmaxi Formation marine black shale, which has rich organic matter in southeastern Sichuan Basin, as an example, The comprehensive utilization of the wild section, rock cores and petrographic thin sections, palaeontology graptolites, logging, and geochemical data is carried out. Based on sequence stratigraphy, the marine shale sequence interface recognition and the sequence of the division are investigated. The study established a sequence boundary recognition method for Marine shales with a lithologic interface to reflect the physical characteristics intuitively, with logging to reflect stratigraphic superposition patterns with the concept of limited time of paleograptolite and using geochemical parameter TH/U to the reflect sedimentary environment, where total organic carbon (TOC), TH, U, and K reflect the stratigraphic rotation. Then, the vertical sequence development characteristics and the sequence characteristics of the connecting well are analyzed, and it is clear that the Wufeng Formation-the first section of the Longmaxi Formation experienced three large-scale transgressive-regressive cycles, and three tertiary sequences and seven system tracts are divided. This paper discusses the control effect of the recession-transgression events and glacial climate on relative sea level. In the end, the sequence evolution model of marine transgression is proposed, which is influenced by glacial climate, tectonic uplift, rising ocean currents, and turbidity currents. These system tracts SQ1-TST, SQ2-TST, and SQ2-EHST are the key layers of organic matter enrichment, and SQ3-TST is the secondary organic matter enrichment stratum. |
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| Keywords: | marine shale Wufeng Formation-Longmaxi Formation sequence stratigraphy sequence interface identification evolution model |
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