西北地质2025，Vol.58Issue(3)：22-32,11.DOI:10.12401/j.nwg.2024114
鄂尔多斯盆地地热和氦气资源远景:来自居里面深度的证据
Geothermal and Helium Resource Prospects in the Ordos Basin:Insight from the Curie Point Depths
摘要
Abstract
The Ordos basin is a polycyclic superposition basin characterized by a diverse array of resources.The depth to the Curie point(CPD)serves as crucial evidence for investigating the crustal thermal structure and helium resource distribution within this basin.Through an analysis of magnetic anomaly characteristics in the Ordos basin,we calculated CPDs utilizing the power spectrum method with varying window sizes and moving steps,ultimately determining the average CPD as our final value.We analyzed CPD characteristics in conjunc-tion with geothermal data and helium distribution.The CPD in the Ordos Basin ranges from 18 to 30 km,with an average depth of 23 km.This relatively minor variation in CPD suggests that the structural integrity of the Ordos Basin remains stable,indicating no significant thermal activity has transpired since its formation.A com-parison with geothermal data from Changqing Oilfield reveals that variations in CPD align closely with ob-served geothermal features.Uplift areas associated with shallower CPDs include Yimeng uplift to the north,re-gions from Yinchuan to Jingbian on the western flank,and areas extending from Yichuan to Huanglong along the southeastern margin;these zones are presumed to possess enhanced geothermal resource potential.Notably,there exists a clear correlation between CPD values in the Ordos Basin and helium concentrations found within natural gas;higher helium content corresponds to shallower CPDs:a phenomenon likely attributable to radioac-tive decay processes involving uranium(U)and thorium(Th)present within source rocks throughout this basin.Based on these findings regarding CPD characteristics,in addition to Huanglong gas field,Dongsheng gas field,the west of Sulige gas field and the south of Sulige gas field,Qingyang-Huanxian-Huachi area and Zhidan-Jing-bian area may also area may also represent prospective helium-rich zones within the Ordos Basin.关键词
居里面深度/磁力异常/功率谱法/地热/氦气/鄂尔多斯盆地Key words
Curie point depth/magnetic anomaly/power spectral method/geothermal energy/helium/Ordos basin分类
地质学引用本文复制引用
冯旭亮,汪啸东,罗姣,魏泽坤,宗翔宇,郭升,罗通..鄂尔多斯盆地地热和氦气资源远景:来自居里面深度的证据[J].西北地质,2025,58(3):22-32,11.基金项目
国家自然科学基金项目"基于不同范数的密度界面三维重力反演研究"(41904115),陕西燃气集团委托课题"渭河盆地华州-华阴地区氦源岩空间分布特征研究"(0102/290024512)联合资助. （41904115）
