Characteristics of Gravity and Magnetic Field and their Significance of Helium Resources Exploration in the Southeastern Ordos Basin
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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。
Abstract: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 intersection areas, which may be potential favorable areas for helium resources.
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Key words:
- helium resources /
- gravity and magnetic anomaly /
- metamorphic rock /
- faults /
- Ordos basin
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地层/岩体 岩石密度ρ（g/cm3） 磁化率（10−5 SI） 密度值 平均值 密度值 平均值 新生界 第四系 1.63～2.10 1.87 36～79 56 古近系
新近系2.30～2.39 2.38 5～13 9.6 中生界 白垩系 2.40 10.5～58.9 18.6 侏罗系 2.41～2.44 2.43 6.5～17.3 10.5 三叠系 2.55 8.8～18.6 15.3 古生界 二叠系 2.60 2.5～22.0 16.3 石炭系 3.2～20.8 9.6 奥陶系 2.70 5.6～14.6 8.8 寒武系 10.5～16.8 12.7 元古界 2.70 5.4～9.2 7.8 太古界 变粒岩 2.76 1300～10600 5600 片麻岩 8.6～1400 780 混合岩 10.5～16.8 13.6 大理岩 11.6～245 18.4 侵入岩 闪长岩 2.5～3.3 40～9545 5332 花岗闪长岩 2.56 2.56 1374.18 花岗岩 2.58 0～6048 3206 玄武岩 2.8～3.3 2.69 10～2713 1250 二长石 2.47～2.71 2.59 771.16 
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