深部金属矿地震数据处理关键技术研究——以内蒙古查干花钼矿区为例

doi:10.11720/wtyht.2022.1453

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Abstract

Deep metal deposits tend to be associated with heterogeneous geological bodies on different scales.Moreover,their orefields mostly lie in areas with complex geological structures,developed faults,and intense lithological changes and have complex surface conditions and structures.As a result,the seismic data of metal deposits frequently originate from complex and variable seismic wave fields suffering the mutual inference of multiple types of waves.Therefore,the seismic data have extremely low signal-to-noise ratios,which severely restricts the seismic interpretation of metal deposits and the prediction of concealed orebodies. With the 2D seismic data of the Chaganhua molybdenum orefield in Inner Mongolia as a case study,this study explored the key techniques for the seismic data processing of deep metal deposits.Specifically,this study analyzed the characteristic of seismic data of the Chaganhua molybdenum deposit and summarized the difficulties with seismic data processing of the metal deposit.Based on these,this study developed a set of processes for the data processing of the Chaganhua molybdenum orefield.The actual processing results agree well with the known orebody distribution in the geological borehole section.To be specific,zones with thick ore bodies generated strong reflected energy,while thinner ore bodies exhibited low-amplitude reflected waves.The results of this study can provide strong support for inferring geological structures and delineating concealed orebodies in the study area.

Key words： deep metal deposits seismic data processing key technology Chaganhua molybdenum orefield

Received: 27 August 2021 Published: 03 January 2023

ZTFLH:

P631.4

Corresponding Authors: WANG Xiao-Jiang E-mail: yhangyu_cgs@163.com;wxiaojiang@mail.cgs.gov.cn

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	Articles by authors
	Hang-Yu YUE
	Xiao-Jiang WANG
	Lei WANG
	Xiao-Qiang CHEN
	Chun-Xiang JIANG
	Pei LI
	Bao-Wei ZHANG

Cite this article:

Hang-Yu YUE,Xiao-Jiang WANG,Lei WANG, et al. Key techniques for seismic data processing of deep metal deposits:A case study of the Chaganhua molybdenum orefield in Inner Mongolia[J]. Geophysical and Geochemical Exploration, 2022, 46(6): 1315-1326.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1453 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I6/1315

The location of 2D seismic line in Chaganhua molybdenum deposit

The original records of different position on the survey line in Chaganhua molybdenum mining area

Seismic data processing flow of Chaganhua molybdenum ore area

Comparison of single-shot record before (a) and after (b) statics of the Chaganhua molybdenum orefield

Comparison of stack section before (a) and after (b) statics of the Chaganhua molybdenum orefield

Comparison of single-shot record before (a) and after (b) true-amplitude recovery of the Chaganhua molybdenum orefield

Comparison of stack section before (a) and after (b) true-amplitude recovery of the Chaganhua molybdenum orefield

Comparison of single-shot record before (a) and after (b) noise attenuation of the Chaganhua molybdenum orefield

Comparison of stack section before (a) and after (b) noise attenuation of the Chaganhua molybdenum orefield

Comparison of single-shot record before (a) and after (b) deconvolution of the Chaganhua molybdenum orefield

Comparison of stack section before (a) and after (b) deconvolution of the Chaganhua molybdenum orefield

Spectrum comparison before (a) and after (b) deconvolution of the Chaganhua molybdenum orefield

Seismic high-precision velocity analysis of the Chaganhua molybdenum orefield
a—controlled gathers;b—stack interval;c—velocity spectrum

Section comparison before (a) and after (b) migration imaging of the Chaganhua molybdenum orefield

Magnified display of seismic section of metallic ore(a) and geological section of known ore body(b) in the Chaganhua molybdenum orefield

The result section of seismic data processing in the Chaganhua molybdenum orefield

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