| 利用地球物理方法探测火山沉积型硼矿——在西藏阿里地区的应用 |
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| 引用本文： | 宋丽蓉,于常青,郑绵平,陈文西,王永智,何俊杰,李桂花,钱鹏.利用地球物理方法探测火山沉积型硼矿——在西藏阿里地区的应用[J].地球物理学报,2017,60(4):1584-1594. |
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| 作者姓名： | 宋丽蓉 于常青 郑绵平 陈文西 王永智 何俊杰 李桂花 钱鹏 |
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| 作者单位： | 1. 中国地质科学院地质研究所, 北京 100037;
2. 北京中油瑞飞信息技术有限责任公司, 北京 102200;
3. 山东科技大学(青岛)地球科学与工程学院, 青岛 266510;
4. 中国地质科学院矿产资源研究所, 北京 100037;
5. 西藏旺盛投资有限公司, 拉萨 850000;
6. 中国石油集团东方地球物理公司吐哈物探处, 哈密 839009;
7. 东华理工大学核工程与地球物理学院, 南昌 330013 |
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| 基金项目： | 国家重点基础研究发展计划项目（2011CB403005）和西藏旺盛投资有限公司联合资助. |
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| 摘 要： | 火山沉积型硼矿形成于新近纪特定的火山+湖相沉积环境条件下,含硼地层具有含硼湖相沉积岩与凝灰岩、安山岩等火山岩互层的多旋回二元沉积结构的特点.由于硼酸盐矿物的沉积发生多在沉积后期,通常与凝灰岩、粘土、灰岩等互层沉积,因此形成的硼矿层具有低密度、低电阻率的特征.针对硼矿层的这种特征,采用综合地球物理技术进行探测.在西藏雄巴地区,首先进行了1:5万高精度重力勘探,获得了研究区的布格重力异常,通过对重力资料的处理分析,获取了研究区的断裂构造发育和重力异常变化,推断了地下地层岩性空间变化特点并圈定出火山沉积型硼矿的发育有利区;在此基础上对有利区域进行了1:5000音频大地电磁测深,获得了研究区地下地层电性结构特征.通过对研究区电法数据的震电拟合及重力和大地电磁资料联合反演并与研究区地质资料相结合,进一步分析了该区地层构造、断裂体系、沉积单元与火山沉积型硼矿的形成关系,并对该区火山沉积型硼矿的分布进行了预测,最终钻探验证结果与预测结果基本一致.
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| 关 键 词： | 火山沉积型硼矿 二元结构 综合地球物理探测 震电拟合 重电联合反演 钻探验证 |
| 收稿时间： | 2016-06-02 |
Exploration of volcanosedimentary boron deposit by geophysical methods——application in the Ngari area,Tibet |
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| SONG Li-Rong,YU Chang-Qing,ZHENG Mian-Ping,CHEN Wen-Xi,WANG Yong-Zhi,HE Jun-Jie,LI Gui-Hua,QIAN Peng.Exploration of volcanosedimentary boron deposit by geophysical methods——application in the Ngari area,Tibet[J].Chinese Journal of Geophysics,2017,60(4):1584-1594. |
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| Authors: | SONG Li-Rong YU Chang-Qing ZHENG Mian-Ping CHEN Wen-Xi WANG Yong-Zhi HE Jun-Jie LI Gui-Hua QIAN Peng |
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| Abstract: | Volcanosedimentary boron deposits are formed in specific volcano and lake facies deposition environment in Neogene period, and the characteristic of the boron bearing stratum is the containing boron lacustrine sedimentary rocks and tuff and andesite volcanic rocks interbedded cyclically and composed binary sedimentary structure. As the borate mineral deposition occurred in the late deposition period, usually associated with tuff and clay and limestone, so the formed boron deposits had the characteristics of low density, low electrical resistivity. According to the characteristic of the boron deposits, we employ comprehensive geophysical technology in the exploration. We firstly conducted the 1∶50000 high-precision gravity survey in the Xiongba area, Tibet, and obtain the Bouguer gravity anomalies. Through the processing and analysis of the gravity data, we got access to the fault structures development and gravity anomaly changes in the study area, deduced the spatial variation characteristics of underground lithology and delineated the favorable mining area of volcanosedimentary boron deposits; based on that, the 1∶5000 audio magnetotelluric sounding is carried out on the favorable area and the electrical structure characteristics of the underground strata in the study area are obtained. Combining the seismic-electric fitting of the electrical data, the joint inversion of gravity and electricity data and the geological data in the study area, we further analyzed stratum structure, fracture system and the distribution of sedimentary rocks and their relation to the volcanosedimentary boron deposits. Then we predicted the distribution of the volcanosedimentary boron deposits, the drilling test results are basically consistent with the predicted results. |
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| Keywords: | Volcanosedimentary boron deposits Binary sedimentary structure Comprehensive geophysical exploration Seismic-electric fitting technology Joint inversion of gravity and electricity data Drilling verification |
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