中国地质2026，Vol.53Issue(2)：433-448,16.DOI:10.12029/gc20240313002
雪峰隆起西南缘下寒武统牛蹄塘组页岩气资源潜力评价
Evaluation of shale gas resource potential in the Lower Cambrian Niutitang Formation at the southwest edge of Xuefeng Uplift
摘要
Abstract
[Objective]The southwestern margin of the Xuefeng Uplift exhibits favorable geological conditions for shale gas,but the structure is complex and poorly preserved.This study evaluates the shale gas potential of the Niutitang Formation in the region,identifying favorable areas for shale gas exploration to support future drill site placement.[Methods]Focusing on the black shales of the Niutitang Formation,this research integrates regional data,cross-sections,core observations,organic geochemical analyses,petrophysical tests,argon ion polishing combined with scanning electron microscopy,gas content,preservation conditions analysis,and recent drilling results.The study characterizes the geological conditions of shale gas in the region,identifies favorable areas,and preliminarily estimates resource volumes.[Results](1)Organic-rich shale deposition in the Niutitang Formation is influenced by deepwater shelf environments,with thickness increasing from northwest to southeast;(2)High organic richness is observed in the black shale of Niutitang Formation,with an average total organic carbon content of 4.31％,δ13C values of the kerogen averaging from-33.04‰ to-33.87‰ indicative of type Ⅰ kerogen,and Ro maturity values ranging from 2.4％to 2.6％,showing moderate thermal evolution;(3)The Niutitang Formation exhibits high quartz content with storage spaces primarily composed of intergranular pores,intragranular pores,organic pores,and fractures,with an average porosity of 6.78％and an average permeability of 0.0580× 10-3μm2,representing a low porosity-low permeability to low porosity-ultra-low permeability reservoir.[Conclusions]Through a multifactor overlay approach,favorable areas for shale gas within the Danzhai,Xuanwei,and Majiang regions of the Niutitang Formation have been identified,with geological resource estimates totaling 3995.39×108 m3.关键词
雪峰隆起西南缘/页岩气/牛蹄塘组/有利区优选/资源量/油气勘查工程Key words
southwest margin of Xuefeng uplift/shale gas/Niutitang Formation/favorable areas selection/quantity of resource/oil and gas exploration engineering分类
天文与地球科学引用本文复制引用
曹竣锋,淡永,马龙,高中泽,闫剑飞,门玉澎,万友利,胡修权,熊国庆,孙媛媛..雪峰隆起西南缘下寒武统牛蹄塘组页岩气资源潜力评价[J].中国地质,2026,53(2):433-448,16.基金项目
中国地质调查局项目(DD20230322、DD20190722、DD20190723)和贵州省基金项目(2022)(ZD005)联合资助. Supported by the projects of China Geological Survey(No.DD20230322,No.DD20190722,No.DD20190723)and Guizhou Provincial Fund(2022)(No.ZD005). （DD20230322、DD20190722、DD20190723）
