西北地质2025，Vol.58Issue(5)：11-23,13.DOI:10.12401/j.nwg.2024130
渭河盆地固市凹陷华州探区新近纪构造运动与沉积作用耦合关系及其对氦气成藏的控制
Coupling Relationship between Neogene Tectonism and Sedimentation and Its Controlling of Helium Accumulation in Huazhou Exploration Area,Gushi Sag,Weihe Basin
摘要
Abstract
Helium is a rare resource and is widely used in the high-tech field.However,the helium supply in China heavily depends on imports.The Huazhou exploration area of Gushi Sag in Weihe basin is a favorable area for helium exploration,which has superior geological conditions for helium accumulation.The drilling re-sults of helium exploration well indicate that the spatial distribution and mutual configuration relationship of the fault systems and favorable reservoir zones are the key to helium-rich gas accumulation.Clarifying the coupling relationship between Neogene tectonism and sedimentation will help to further ascertain the regularity of fault activity and characteristics of the spatial distribution of sedimentary facies of the study area,which is of great significance for clearing the exploration and deployment of helium resource.Combining with the various low-temperature thermochronology data accumulated of the adjacent area,this study conducts a comprehensive anal-ysis of drilling logging,well logging,core samples,seismic,and carbon and helium isotope data.The results in-dicate that the multiple rapid uplift events of the Qinling orogenic belt aggravated the faulted effect and pro-duced a series of secondary faults developed by deep major faults of the northern margin of Qinling Mountains,which can provide favorable migration channels for the upward migration of the deep helium and hydrocarbon carrier gas.The thick conglomerate layer of the lower Lantian-Bahe Formation is the sedimentary response of the rapid uplift of Qinling orogenic belt,and the Formation mainly developed the fan-delta root subfacies.The lithology of the upper Lantian-Bahe Formation is mainly characterized by the interbeds of sandstone,sandy mudstone,and mudstone,and the Formation mainly developed the middle and marginal sub-facies.Moreover,the carbon and helium isotope values of gas samples from Lantian-Bahe Formation indicate that coal-type methane gas is developed in this area and the helium is mainly the type of crustal source.Zhangjiapo Formation is mainly characterized by lacustrine facies,and the thin sandstone bodies in the Formation can be expected to be favorable facies zone for helium accumulation.The thick-bedded mudstone developed in the Zhangjiapo Forma-tion is considered to be a favorable source rock segment of biogas and important cap in this area.Zhangjiapo Formation has a complete combination of generation,transport,storage,and cap for helium accumulation from bottom to top and can be used as an important zone for helium exploration.关键词
渭河盆地/固市凹陷/华州探区/构造运动/沉积特征/氦气成藏Key words
Weihe basin/Gushi Sag/Huazhou exploration area/tectonism/sedimentary characteristics/helium accumulation分类
天文与地球科学引用本文复制引用
蔡鑫磊,李谦益,张阳,张国强,李正,范明璞,王宝文,李萌瑶..渭河盆地固市凹陷华州探区新近纪构造运动与沉积作用耦合关系及其对氦气成藏的控制[J].西北地质,2025,58(5):11-23,13.基金项目
深地国家科技重大专项"盆地边缘天然氦富集与探测(SQ2025AAA060128)、陕西省地质勘查基金项目"陕西省华州-华阴地区地热水及氦气普查"(陕地勘金字[2021]38号)联合资助. （SQ2025AAA060128）
