| 司建涛.坦桑尼亚恩泽加绿岩带隐伏金矿床综合找矿模型[J].地质与勘探,2023,59(3):678-690 |
| 坦桑尼亚恩泽加绿岩带隐伏金矿床综合找矿模型 |
| Comprehensive prospecting model of concealed gold deposits in Nzega greenstone belt, Tanzania |
| 投稿时间：2022-07-27 修订日期：2022-12-16 |
| DOI：10.12134/j.dzykt.2023.03.018 |
| 中文关键词: 隐伏 金矿床 找矿模型 恩泽加绿岩带 坦桑尼亚 |
| 英文关键词: concealed, gold deposit, prospecting model, Nzega greenstone belt, Tanzania |
| 基金项目:河南省财政地质勘查项目资金（编号：豫国土资发[2017]22号、豫自然资发[2019]22号）资助 |
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| 中文摘要: |
| 恩泽加绿岩带是坦桑尼亚重要的成矿带之一，产出了高登普莱德 （Golden Pride）等多个大型金矿。通过对坦桑尼亚恩泽加绿岩带已发现的隐伏金矿床进行分析研究，结果显示恩泽加绿岩带隐伏金矿床构造控矿作用明显；高精度磁法和激电中梯测量结果显示含矿构造蚀变带具有高磁、低阻、相对高极化的特征；土壤地球化学测量结果显示成矿元素 Au 异常在空间分布上大于相应的含矿构造蚀变带的分布范围， 其浓集方向与含矿构造蚀变带展布一致，并与指示元素 As、Sb 的套合性较好。根据该区域隐伏金矿床的地质、地球物理及地球化学特征，对该区隐伏金矿床的找矿标志进行了总结，明确了各找矿标志与隐伏金矿床之间的关系，并在此基础上构建了恩泽加绿岩带隐伏金矿床的综合找矿模型，该模型的应用显示了多种技术手段联合实施在寻找绿岩带型隐伏金矿床的有效性。 |
| 英文摘要: |
| Taking the Benxi Formation glutenite reservoir in Yanchang east block of the Ordos Basin as an example, this work analyzed the occurrence characteristics of reservoir pores and fluids by means of casting thin section, scanning electron microscope, high pressure mercury injection and nuclear magnetic resonance (NMR), and further discussed the influencing factors of the differential occurrence of fluids. The reservoir mainly includes intergranular solution pores and intercrystalline pores, which can be subdivided into fracture-intergranular solution pores, intercrystalline pore-dissolved pores, dissolved pores and micro pores. Especially, fracture-intergranular dissolved pores and intergranular pore-dissolved pores possess good reservoir properties. The reservoir movable fluids have a saturation of 51.16%~86.82%, and the T2 spectra are mainly bimodal, low on the left and high on the right. The differences of reservoir pore development exert different controls on the movable fluids, and dissolved pore and microporous reservoirs with poor pore development can still have high movable fluid saturation. Intergranular dissolved pore, maximum connected pore throat radius, median radius and maximum mercury saturation affect the reservoir movable fluid saturation, especially in fracture-intergranular dissolved pore and intergranular pore-dissolved pore reservoirs. The movable fluid saturation of solution porous and microporous reservoirs is more significantly affected by iron dolomite. Iron dolomite can improve the wettability of the interface, which results in good fluid ability in its nano-pores. |
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