甘肅北山新場地段花崗巖體展布及內(nèi)部結(jié)構(gòu)電磁法探測
發(fā)布時間：2019-06-02 03:22
【摘要】：我國開展高放廢物地質(zhì)處置研究有20多年的歷史,在處置庫地質(zhì)選址中,已經(jīng)把甘肅北山新場地段的花崗巖體作為重點選址區(qū)域加以研究,業(yè)已取得了許多重要的地質(zhì)研究成果。為了對該區(qū)深部巖體進行安全性和穩(wěn)定性評價,進一步探明巖體的結(jié)構(gòu)和控制巖體的構(gòu)造是今后地球物理勘查的主要目的。本文結(jié)合核工業(yè)地質(zhì)局高放廢物地質(zhì)處置研究開發(fā)項目,以甘肅北山新場地段花崗巖為研究對象,開展以大地電磁測深為主的深部地球物理勘查工作,為預(yù)選區(qū)場址特性評價提供科學(xué)依據(jù)。在野外數(shù)據(jù)采集中選用混場源高頻電磁法和大地電磁法兩種測量方式,獲得了大量的大地電磁測深實測資料,在對實測數(shù)據(jù)進行預(yù)處理的基礎(chǔ)上,采用一維OCCAM算法進行反演計算,獲得了研究區(qū)各條測線的電阻率反演剖面。結(jié)合剖面附近的鉆孔資料和地質(zhì)條件對每條電阻率剖面進行推斷解釋。分析表明,電阻率異常較好地反映了發(fā)育于巖體內(nèi)部或巖體邊界處斷裂構(gòu)造的分布情況和產(chǎn)狀特征,據(jù)此確定了新場地段兩個主要目標巖體(新場巖體和芨芨槽巖體)的空間展布形態(tài),并對巖體的完整性進行了評價。研究結(jié)果表明,由于大多數(shù)分布于新場地段花崗巖體內(nèi)部的構(gòu)造破碎帶向下切割深度小于300m,說明對深部巖體的破壞性較小,巖體的完整性較好�？紤]到在野外數(shù)據(jù)采集過程中,常常受到各種干擾因素的影響,加上紀錄時間長短的限制,造成了數(shù)據(jù)的分散、跳躍或突變,為了消除干擾,在數(shù)據(jù)處理過程中,對濾波去噪方法和應(yīng)用效果進行了研究。引入中值濾波去噪方法,嘗試對MT電磁測深剖面上多個受干擾較嚴重測點上的實測數(shù)據(jù)進行去噪濾波,為了取得最佳的處理效果,分別選取多個濾波窗口,進行對比試驗,結(jié)果表明,二維窗口[4×4]更能有效地阻止“飛點”異常,并且對大的電性變化不會產(chǎn)生平滑,可作為電磁測深數(shù)據(jù)降噪的最佳窗口,為后續(xù)數(shù)據(jù)處理奠定了理論基礎(chǔ)。
[Abstract]:The research on geological disposal of high-level radioactive waste in China has been carried out for more than 20 years. In the geological location of disposal reservoir, the granite body in Xinchang area of Beishan, Gansu Province has been studied as the key site selection area. Many important geological research achievements have been made. In order to evaluate the safety and stability of the deep rock mass in this area, it is the main purpose of geophysical exploration in the future to further find out the structure of the rock mass and control the structure of the rock mass. In this paper, based on the research and development project of high level radioactive waste geological disposal in the Bureau of Nuclear Industry Geology, taking granite in Xinchang area of Beishan, Gansu Province as the research object, the deep geophysical exploration based on magnetotelluric bathymetric survey is carried out. It provides a scientific basis for the evaluation of site characteristics in pre-selected areas. In the field data acquisition, mixed field source high frequency electromagnetic method and magnetotelluric method are selected to obtain a large number of measured magnetotelluric bathymetric data, and on the basis of preprocessing the measured data, The one-dimensional OCCAM algorithm is used for inversion calculation, and the resistivity inversion profiles of each measuring line in the study area are obtained. Based on the drilling data and geological conditions near the section, each resistivity profile is inferred and interpreted. The analysis shows that the electrical resistance anomaly reflects the distribution and occurrence characteristics of fault structures developed in the rock mass or at the boundary of the rock mass. Based on this, the spatial distribution patterns of two main target rock masses (Xinchang rock mass and Achnatherum splendens trough rock mass) in Xinchang area are determined, and the integrity of rock mass is evaluated. The results show that because most of the structural fracture zones distributed in Xinchang area are cut down by less than 300m, the damage to deep rock mass is less and the integrity of rock mass is better. Considering that in the process of field data acquisition, it is often affected by various interference factors, coupled with the limitation of recording time, resulting in the dispersion, jump or mutation of the data. In order to eliminate the interference, in the process of data processing, The filtering denoising method and its application effect are studied. The median filter denoising method is introduced to Denoise the measured data at several seriously disturbed measuring points on the MT electromagnetic bathymetric profile. in order to obtain the best processing effect, several filtering windows are selected and the comparative experiments are carried out. The results show that the two-dimensional window [4 脳 4] can effectively prevent the "flying point" anomaly and will not smooth the large electrical change. It can be used as the best window for noise reduction of electromagnetic bathymetric data, which lays a theoretical foundation for subsequent data processing.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P631.325;TL942.1
本文編號：2490795
[Abstract]:The research on geological disposal of high-level radioactive waste in China has been carried out for more than 20 years. In the geological location of disposal reservoir, the granite body in Xinchang area of Beishan, Gansu Province has been studied as the key site selection area. Many important geological research achievements have been made. In order to evaluate the safety and stability of the deep rock mass in this area, it is the main purpose of geophysical exploration in the future to further find out the structure of the rock mass and control the structure of the rock mass. In this paper, based on the research and development project of high level radioactive waste geological disposal in the Bureau of Nuclear Industry Geology, taking granite in Xinchang area of Beishan, Gansu Province as the research object, the deep geophysical exploration based on magnetotelluric bathymetric survey is carried out. It provides a scientific basis for the evaluation of site characteristics in pre-selected areas. In the field data acquisition, mixed field source high frequency electromagnetic method and magnetotelluric method are selected to obtain a large number of measured magnetotelluric bathymetric data, and on the basis of preprocessing the measured data, The one-dimensional OCCAM algorithm is used for inversion calculation, and the resistivity inversion profiles of each measuring line in the study area are obtained. Based on the drilling data and geological conditions near the section, each resistivity profile is inferred and interpreted. The analysis shows that the electrical resistance anomaly reflects the distribution and occurrence characteristics of fault structures developed in the rock mass or at the boundary of the rock mass. Based on this, the spatial distribution patterns of two main target rock masses (Xinchang rock mass and Achnatherum splendens trough rock mass) in Xinchang area are determined, and the integrity of rock mass is evaluated. The results show that because most of the structural fracture zones distributed in Xinchang area are cut down by less than 300m, the damage to deep rock mass is less and the integrity of rock mass is better. Considering that in the process of field data acquisition, it is often affected by various interference factors, coupled with the limitation of recording time, resulting in the dispersion, jump or mutation of the data. In order to eliminate the interference, in the process of data processing, The filtering denoising method and its application effect are studied. The median filter denoising method is introduced to Denoise the measured data at several seriously disturbed measuring points on the MT electromagnetic bathymetric profile. in order to obtain the best processing effect, several filtering windows are selected and the comparative experiments are carried out. The results show that the two-dimensional window [4 脳 4] can effectively prevent the "flying point" anomaly and will not smooth the large electrical change. It can be used as the best window for noise reduction of electromagnetic bathymetric data, which lays a theoretical foundation for subsequent data processing.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P631.325;TL942.1
【參考文獻】
相關(guān)期刊論文 前1條
1 劉林清;遙感技術(shù)在高放廢物處置庫場址預(yù)選中的應(yīng)用[J];遙感技術(shù)與應(yīng)用;1994年02期
，本文編號：2490795
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