鄂尔多斯盆地东南部重磁场特征及其氦气勘探意义  

Characteristics of Gravity and Magnetic Field and their Significance of Helium Resources Exploration in the Southeastern Ordos Basin

作　　者：魏泽坤 冯旭亮 马佳月 杨柳[1,2] 吴传波 刘凯轩 WEI Zekun;FENG Xuliang;MA Jiayue;YANG Liu;WU Chuanbo;LIU Kaixuan(Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi’an Shiyou University,Xi’an 710065,Shaanxi,China;School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,Shaanxi,China;National Engineering Research Center of Offshore Oil and Gas Exploration,Beijing 100028,China)

机构地区：[1]西安石油大学陕西省油气成藏地质学重点实验室,陕西西安710065 [2]西安石油大学地球科学与工程学院,陕西西安710065 [3]海洋油气勘探国家工程研究中心,北京100028

出　　处：《西北地质》2023年第5期98-110,共13页Northwestern Geology

基　　金：西安石油大学研究生创新与实践能力培养计划资助(YCS21213184)资助。

摘　　要：氦气作为一种稀有气体,广泛应用于国防军工、高新技术产业发展等领域,关系到国家的安全与发展。中国氦气资源短缺,对外依赖程度高。鄂尔多斯盆地内展现出了较好的氦气资源前景,但对与氦气分布密切相关的氦源岩及断裂特征研究较少,制约了对盆地氦气资源潜力的认识。笔者利用归一化总水平导数垂向导数(NVDR−THDR)、垂向导数、位场分离等技术对鄂尔多斯盆地东南部的重磁资料进行处理,推断主要断裂和潜在的氦源岩(强磁性变质岩)。鄂尔多斯盆地东南部氦气分布受基底断裂与氦源岩分布的双重控制,基底强磁性变质岩为盆地内部的氦气富集提供气源条件,断裂活动则为氦气运移提供通道。富县−宜川−黄龙一带分布有大量的强磁性变质岩,大多位于断裂附近及其交汇区域,可能是氦气资源潜在有利区。Helium is widely used in the fields of national defense,military industry,high−tech industry development and so on,as a rare gas related to the national security and development.China is short of helium resources and highly dependent on foreign countries.There is a good prospect of helium resources in Ordos basin.However,there are fewer study on the characteristics of the helium source rocks and the faults related closely to the helium distribution,which limits the evaluation of the helium resource potential in the basin.In this thesis,the gravity and magnetic data in the southeast of Ordos basin are processed by using the normalized vertical derivative of the total horizontal derivative(NVDR−THDR),vertical derivative and potential field date separation techniques,and inferred the main faults and potential helium source rocks(strong magnetic metamorphic rocks). The distribution of helium resources is controlled by the basement faults and the distribution of helium source rocks. The strong magnetic metamorphic rocks provide gas source conditions for helium enrichment in the basin, and fault activity provides channels for helium migration. There are a large number of metamorphic rocks distributed in Fuxian−Yichuan−Huanglong area. Most of them are located near faults and their intersec-tion areas, which may be potential favorable areas for helium resources.

关 键 词：氦气资源 重磁异常 变质岩 断裂 鄂尔多斯盆地 

分 类 号：P631.1[天文地球—地质矿产勘探] P631.2[天文地球—地质学]