东北石油大学学报2024，Vol.48Issue(3)：52-68,17.DOI:10.3969/j.issn.2095-4107.2024.03.005
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
Abstract
To explore the distribution features of the Devonian tentaculitic shales in the Northeastern Di-anqiangui 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 pro-duction 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 Dian-qiangui Basin can be divided into 13 third-order sequences,with deep-water facies shales mainly devel-oped in SQ5-SQii.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 exten-sion 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/organ-ic matter abundance/Devonian/Dianqiangui Basin分类
天文与地球科学引用本文复制引用
张英杰,陆济璞,王新宇,岑文攀,马成龙,陈基瑜,黄文芳,李豪,于新武..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[J].东北石油大学学报,2024,48(3):52-68,17.基金项目
广西科技厅重点研发计划项目(2021AB30011) （2021AB30011）
广西地质矿产勘查开发局科研项目(GXDK202430) （GXDK202430）
桂北重点地区页岩气资源调查评价(桂自然资函[2021]2061号) （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) （桂地矿地[2018]130号）
