Application of Electrical Prospecting Technology in Extraction Process of In-situ Leaching in Uranium Deposit

doi:10.19657/j.geoscience.1000-8527.2018.04.21

Abstract

Abstract:

In-situ leaching for uranium is an advanced technology which extracts uranium by injecting leaching solution into the ore-bearing formation and pumping lixiviate out from the ore-bearing formation based on the water permeability of the sandstone orebed.Studying the distribution range of the leaching solution below well field will not only help to learn the coverage range of the orebody covered by leaching solution and mining rate, but also be significance to monitoring the underground water pollution. Electrical prospecting methods were carried out in the Uranium In-Situ Leaching(ISL) Test Base in Erlian Basin of Inner Mongolia in order to perform a monitoring test on the course of ISL for uranium. The monitoring tests consist of controlling source audio magneto telluric method (CSAMT) and time domain induced polarization method (TDIP).The test area was divided by an 18×18 survey grid with the both line-line and dot-dot space of 10 m apart. During the test, CSAMT was performed on 5 longitudinal and 4 transverse prospecting lines which crossed through the well unit and TDIP was conducted on the whole well field. A plane polarizability contour map of TDIP and a 2-dimensional apparent resistivity model were obtained after data processing and inversion. Combining the result with the geological information known in the test area, it is considered that the low resistivity anomaly region in the apparent resistivity profile below the pumping well unit is the reflection of the distribution state of the leaching solution underground during the in-situ leaching process, meanwhile,a massive low-polarizability anomaly region in the plane apparent polarizability contour map below the pumping well unit is caused by film polarization effect occurring within the ionic conduction system which consists of leaching solution and rock formation.

Key words: in-situ leaching, solution, electrical prospecting method, resistivity, polarizability, thin film polarization

CLC Number:

P631.3

HE Ke, ZHAO Yuancheng, LI Jianhua, WANG Gang, YE Gaofeng. Application of Electrical Prospecting Technology in Extraction Process of In-situ Leaching in Uranium Deposit[J]. Geoscience, 2018, 32(04): 850-862.

Figures/Tables 15

References 15

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序号	岩性	钻孔个数	视电阻率/(Ω·m)
1	泥岩	33	2.25~8.46
1	泥岩	33	7.63
2	粉砂岩	33	7.83~14.38
2	粉砂岩	33	12.50
3	细砂岩	37	12.78~18.69
3	细砂岩	37	16.72
4	中砂岩	35	17.69~27.81
4	中砂岩	35	22.81
5	粗砂岩	35	22.75~38.69
5	粗砂岩	35	28.62
6	砂质砾岩	34	28.62~44.52
6	砂质砾岩	34	33.25
7	砾岩	37	29.21~48.26
7	砾岩	37	37.52

序号	岩性	钻孔个数	视电阻率/(Ω·m)
1	泥岩	33	2.25~8.46
1	泥岩	33	7.63
2	粉砂岩	33	7.83~14.38
2	粉砂岩	33	12.50
3	细砂岩	37	12.78~18.69
3	细砂岩	37	16.72
4	中砂岩	35	17.69~27.81
4	中砂岩	35	22.81
5	粗砂岩	35	22.75~38.69
5	粗砂岩	35	28.62
6	砂质砾岩	34	28.62~44.52
6	砂质砾岩	34	33.25
7	砾岩	37	29.21~48.26
7	砾岩	37	37.52

地层			代号	主要岩性	电阻率/(Ω·m)
第四系			Q	黄土、黏土	3~30
				碱、盐、淤泥	0.2~5.0
				干砂、砾石	100~300
				湿砂	30~60
第三系			R	砂砾岩、泥岩、砾石以石英为主,次为火山碎屑岩	5~100
白垩系	上统		K₂	砂泥、砂砾岩互层	6~15
	下统	赛汗塔拉组	K₁bs	砂砾石、含砾砂岩夹泥岩夹煤层	6~35
		腾格尔组	K₁bt	泥岩、粉砂岩	2~12
		阿尔善组	K₁ba	上部为砂砾岩、含砾砂岩、夹泥岩,中部为泥岩、泥质砂岩,下部为巨厚的砂砾岩	5~58
侏罗系	上统		J₃	火山碎屑岩、火山熔岩	50~300
侏罗系	下统		J_1-2	砂岩、泥岩、炭质页岩	80~500

地层			代号	主要岩性	电阻率/(Ω·m)
第四系			Q	黄土、黏土	3~30
				碱、盐、淤泥	0.2~5.0
				干砂、砾石	100~300
				湿砂	30~60
第三系			R	砂砾岩、泥岩、砾石以石英为主,次为火山碎屑岩	5~100
白垩系	上统		K₂	砂泥、砂砾岩互层	6~15
	下统	赛汗塔拉组	K₁bs	砂砾石、含砾砂岩夹泥岩夹煤层	6~35
		腾格尔组	K₁bt	泥岩、粉砂岩	2~12
		阿尔善组	K₁ba	上部为砂砾岩、含砾砂岩、夹泥岩,中部为泥岩、泥质砂岩,下部为巨厚的砂砾岩	5~58
侏罗系	上统		J₃	火山碎屑岩、火山熔岩	50~300
侏罗系	下统		J_1-2	砂岩、泥岩、炭质页岩	80~500

岩石类型	块数	极化率
岩石类型	块数	变化范围	平均值
硅化岩	29	0.350~1.206	0.82
板岩	11	0.31~6.11	2.96
变质细砂岩	32	0.567~2.485	1.31
粗面岩	2	0.13~3.63	1.88
二长花岗岩	32	0.471~2.437	1.38
砂岩	12	0.39~6.18	1.52
绢云片岩	4	0.40~1.13	0.67
砾岩	1	0.36	0.36
玄武岩	10	1.11~3.85	2.09
石英斑岩	1	1.84	1.84
石英闪长岩	32	0.976~2.722	1.91
流纹岩	30	0.21~2.85	1.55
凝灰岩	23	0.12~3.47	1.00
英安岩	12	1.54~3.31	2.43
花岗岩	32	0.853~2.533	1.54
辉绿岩	10	3.21~5.02	4.39