滇黔桂盆地东北部泥盆系竹节石页岩时空分布与沉积特征

The spatio-temporal distribution and sedimentary characteristics of the Devonian tentaculitic shales in the Northeastern Dianqiangui Basin

摘要

为探讨滇黔桂盆地东北部泥盆系竹节石页岩的分布特征、竹节石与有机质聚集作用的联系,对吾隘剖面、东风剖面、上林西剖面、寨沙剖面、荔浦剖面和贵港剖面的地层旋回性进行研究,对竹节石页岩的有利产出阶段、空间展布特征、地层厚度变化和微观特征进行分析。结果表明:滇黔桂盆地东北部的泥盆系可划分为13个三级层序,暗色泥页岩主要发育于SQ₅~SQ₁₁;在二级海平面变化上升阶段,竹节石页岩主要形成于每个三级层序的海侵体系域(TST₅~TST₉),在二级海平面变化最高阶段,竹节石页岩主要形成于每个三级层序的高水位海退体系域(HST₁₀~HST₁₁);竹节石页岩在空间分布上受同生断裂带的控制,沿断裂带展布方向上延伸相对良好,沿非断裂带展布方向上延伸很差;竹节石页岩构成的富有机质页岩的有机质来源与竹节石关系密切,竹节石的富集程度对潜在性富有机质页岩的有机质丰度具有一定的指示作用。该结果为浮游生物在滇黔桂盆地东北部泥盆系有机质聚集过程中的作用提供实例。

Abstract

To explore the distribution features of the Devonian tentaculitic shales in the Northeastern Dianqiangui Basin, as well as the relationship between the tentaculitoids and organic matter accumulation, this study analyzes the stratigraphic cyclicity in multiple outcrop sections such as Wu'ai, Dongfeng, Shanglinxi, Zhaisha, Lipu, and Guigang. Additionally, this paper also investigates the favorable production stages, spatial distribution features, changes in stratigraphic thickness, and microscopic features of the tentaculitic shales. The results show that the Devonian strata in the northeast parts of the Dianqiangui Basin can be divided into 13 third-order sequences, with deep-water facies shales mainly developed in SQ₅-SQ₁₁. During the rising stage of the second-order sea-level fluctuation, the tentaculitic shales are mainly formed in the TSTs of third-order sequences (TST₅-TST₉). During the high-stand stage of the second-order sea-level fluctuation, the tentaculitic shales are mainly formed in the HSTs of third-order sequences (HST₁₀-HST₁₁). The spatial distribution of tentaculitic shales is controlled by syn-sedimentary fault zones, with relatively good extension along the direction of fault zones and poor extension along non-direction of fault zones. The origin of organic matter in the tentaculitic shales are closely related to tentaculitoids. The enrichment degree of tentaculitoids may have a certain indicative effect on the organic matter abundance of potential organic-rich shales. This study provides an example of the role played by plankton in the process of organic matter accumulation in Northeastern Dianqiangui Basin.

关键词

竹节石 / 三级层序 / 富有机质页岩 / 时空分布 / 有机质丰度 / 泥盆系 / 滇黔桂盆地

Key words

tentaculitoids / third-order sequence / organic-rich shale / spatio-temporal distribution / organic matter abundance / Devonian / Dianqiangui Basin

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基金资助

广西科技厅重点研发计划项目(2021AB30011)

广西地质矿产勘查开发局科研项目(GXDK202430)

桂北重点地区页岩气资源调查评价(桂自然资函[2021]2061号)

广西页岩气有利目标区优选与调查(桂地矿地[2018]130号)