| 何犇,卢树藩,代雅然,符宏斌,罗香建,刘国栋.贵州紫云地区早石炭世黑色岩系地球化学特征及油气地质意义[J].贵州地质,2022,39(4):332-341 |
| 贵州紫云地区早石炭世黑色岩系地球化学特征及油气地质意义 |
| Geochemical Characteristics and Petroleum Geological Significance of Black Rock Series in the Early Carboniferous of Ziyun Area，Guizhou province |
| 投稿时间：2022-08-22 |
| DOI： |
| 中文关键词: 早石炭世 打屋坝组 贵州紫云 地球化学 沉积环境 海平面 有机质 |
| 英文关键词:Early Carboniferous Dawuba Formation Guizhou Ziyun Geochemistry Sedimentary environment The sea level Organic matter |
| 基金项目:贵州省紫云地区下石炭统打屋坝组沉积环境及烃源岩特征研究(2019黔地矿科合32号)；贵州威宁-赫章地区石炭系烃源岩特征及页岩气成藏研究(2021黔地矿科合9号)；贵州关键页岩气目的层成藏条件对比研究(2021黔地矿科合6号)。 |
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| 中文摘要: |
| 为了深入探讨贵州紫云地区早石炭世黑色岩系的沉积环境、海平面变化及有机质富集规律，笔者针对该地区早石炭世打屋坝组进行系统采样，重点进行元素地球化学和有机地球化学特征分析。通过结合研究区打屋坝组泥页岩δCe、δEu、V/(V+Ni)、Sr/Ba等值和前人研究成果进行分析，认为紫云-长顺一带早石炭世打屋坝组沉积环境为还原环境-弱氧化环境，沉积相为槽盆边缘斜坡相→槽盆相；通过分析研究区打屋坝组泥页岩稀土元素地球化学参数及TOC值的垂向变化，认为δCe值越小，δEu、ΣREE值越大，则海平面升高，水体越深，TOC值越高，有机质越富集，反之亦然。同时结合打屋坝组岩性的垂向变化，研究区早石炭世打屋坝组垂向上自下而上主要经历了海退-海进-海退的过程；根据δCe、δEu等值及ω(La)N/ω(Yb)N与ω(ΣREE)关系图解，认为研究区打屋坝组母岩主要为花岗岩与沉积岩的混合，推测物源来自于北东侧的雪峰山隆起区和北侧的黔中隆起区，沉积于被动大陆边缘；结合研究区打屋坝组泥页岩有机地球化学参数和黔紫页1井含气性、气测录井资料，认为研究区打屋坝组一段为优质页岩层段，具备良好的页岩气地质条件和勘探开发潜力，研究区南西部(侧)更有利于有机质富集，可作为下一步页岩气勘探工作方向。 |
| 英文摘要: |
| In order to further explore the sedimentary environment，sea level change and organic matter enrichment law of the Early Carboniferous black rock series in Ziyun area，Guizhou Province，it systematically sampled the Early Carboniferous Dawuba Formation in this area，and analyzed the elemental geochemistry and organic geochemistry characteristicsBased on the analysis of δCe，δEu，V/(V+Ni)，Sr/Ba values of shale in the Dawuba Formation in the study area and the previous research results，it is concluded that the sedimentary environment of Dawuba Formation in the Ziyun-Changshun area of the Early Carboniferous is a reductive environment and a weak oxidation environment，and the sedimentary facies is the slope facies of trough and basin margin → trough and basin faciesBy analyzing the vertical variation of REE geochemical parameters and TOC values of shale in the Dawuba Formation in the study area，it is concluded that the smaller the δCE value is，the larger the δEu and σ REE value is，the higher the sea level rises，the deeper the water is，the higher the TOC value is and the more enriched the organic matter is，and vice versaAt the same time，combined with the lithologic changes of the Dawuba Formation in the vertical direction，the Dawuba Formation in the study area experienced the process of regressive，transgressive and regressive from vertical to bottom-up in the early CarboniferousAccording to the diagram of δCE，δEu value，ω(La)N/ω(Yb)N and ω(σ REE)relationship，it is believed that the parent rocks of the Dawuba Formation in the study area are mainly mixed granite and sedimentary rocks，and the provenance is inferred to be from the Xuefengshan uplift in the northeast and the central Guizhou uplift in the north，and deposited in the passive continental marginCombining with the study area Dawuba Formation of organic geochemical parameters of the shale and Qianziye-1 well hydrocarbon content，gas well logging data，author think the study area house dam group a high-quality shale section，good shale gas geologic conditions and exploration and development potential，South and west of the study area is more conducive to the enrichment of organic matter，it can be used as the next step of shale gas exploration direction |
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