沉积与特提斯地质2024，Vol.44Issue(2)：267-277,11.DOI:10.19826/j.cnki.1009-3850.2023.03002
黔北地区下寒武统牛蹄塘组泥岩沉积环境及页岩气勘探潜力
Sedimentary environment and shale gas exploration potential of Lower Cambrian Niutitang Formation in northern Guizhou
摘要
Abstract
The Lower Cambrian Niutitang Formation is one of the major marine carbonaceous shale horizons in southern China,which is widely distributed in northern,central and eastern Guizhou with stable horizons.The Niutitang Formation is mainly composed of black carbonaceous mudstone,which is thin-bedded and horizontally bedded.Its components are mainly clay minerals,quartz and a small amount of carbonaceous components and pyrite.Compared with the mean values of Australian Post-Archean Shale(PAAS),the contents of V,Mo,and U in the mudstone of Niutitang Formation are higher,while the contents of Co,Cu,Zn,and Th are lower.The content of AU,as well as the element content ratios of V/Cr,Ni/Co,U/Th,and V/(V+Ni)indicate that the sedimentary environment of the black mudstone in the Niutitang Formation is in a state of hypoxia reduction.The(La/Yb)N ratio is significantly greater than 1,with a large degree of differentiation between light rare earth elements and heavy rare earth elements,indicating a low deposition rate.The TOC abundance of the mudstone in the Niutitang Formation is high,at the stage of high maturity to over maturity,with a high content of brittle minerals,and an effective thickness of approximately 30 to 100 meters.In conclusion,the black mudstone of the Niutitang Formation in northern Guizhou Province possesses good material conditions for the formation of shale gas reservoirs,indicating its promising potential for shale gas exploration.关键词
牛蹄塘组/页岩气/沉积环境/勘探潜力/黔北Key words
Niutitang Formation/shale gas/sedimentary environment/exploration potential/northern Guizhou分类
天文与地球科学引用本文复制引用
何洪茜,肖加飞,杨海英,兰青,黄明亮..黔北地区下寒武统牛蹄塘组泥岩沉积环境及页岩气勘探潜力[J].沉积与特提斯地质,2024,44(2):267-277,11.基金项目
国家自然科学基金项目(41830432,41972095) （41830432,41972095）
贵州省科技计划项目(黔科合字基础[2017]1194) （黔科合字基础[2017]1194）
