發(fā)布時間：2018-02-24 03:22

  本文關(guān)鍵詞： CSAMT 地?zé)峥碧?全區(qū)視電阻率 近場效應(yīng) 近場校正　出處：《吉林大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：地?zé)豳Y源是新型的綠色能源，其勘探開采越來越受到國家和社會的重視。長白山地區(qū)地?zé)豳Y源儲量豐富，長白山地區(qū)的天池火山群和龍崗火山群是我國著名的現(xiàn)代火山活動區(qū)，深部巖漿房為該區(qū)地?zé)崽锾峁┝藷嵩茨芰�，溫泉出露點(diǎn)1000多處，具有巨大的開發(fā)潛力。 可控源音頻大地電磁法是通過觀測人工場源在大地中激發(fā)的電磁場響應(yīng)的一種電磁測深方法。近年來，CSAMT在深部地?zé)峥碧街械玫搅藦V泛應(yīng)用。論文研究了可控源音頻大地電磁法的國內(nèi)外研究現(xiàn)狀和可控源音頻大地電磁法的基礎(chǔ)理論；然后給出了一種把卡尼亞視電阻率換算為全區(qū)電阻率的便利方法，采用電場正演迭代擬合卡尼亞視電阻率來進(jìn)行近場改正。通過建立二、三層電性斷面模型，對比分析說明在遠(yuǎn)區(qū)該方法求得的全區(qū)視電阻率等于卡尼亞電阻率，，在近區(qū)和過渡區(qū)則明顯改善了卡尼亞視電阻率的畸變。實(shí)測CSAMT資料中，對比了基于全區(qū)視電阻率的一維反演圖、基于卡尼亞視電阻率的一維反演圖、用OCCAM法進(jìn)行的視電阻率一維反演圖，以及由卡尼亞視電阻率直接進(jìn)行帶源反演所得一維反演圖，說明了該方法的可行性。 論文以可控源音頻大地電磁法在松江河某區(qū)地?zé)峥辈橹械膽?yīng)用為例，搜集了研究區(qū)的地質(zhì)及地球物理資料。以研究區(qū)地質(zhì)資料為基礎(chǔ)、重磁及水文資料為依據(jù)，并結(jié)合以往周邊工作資料，分析探討研究區(qū)電性反演剖面的電性異常特點(diǎn)，并據(jù)此初步劃分地層、確定斷裂構(gòu)造傾向并確定有利井位。通過CSAMT法在該研究區(qū)地?zé)峥辈橹械难芯繎?yīng)用，取得了如下成果和認(rèn)識： 1、該方法求得的全區(qū)視電阻率在遠(yuǎn)區(qū)等價于卡尼亞視電阻率；在近區(qū)和過渡區(qū)，改正卡尼亞視電阻率畸變效果非常明顯。 2、運(yùn)用全區(qū)視電阻率反演能夠直觀地反映介質(zhì)電阻率的垂向變化特征，增大了CSAMT探測的深度。 3、該正演方法簡便，運(yùn)算速度較快。在實(shí)際工作中，該方法具有較大的應(yīng)用價值。 4、在研究區(qū)的工作，主要取得以下成果： a.研究區(qū)從地表到地下2000米，可分為四個構(gòu)造層。 b.確定了研究區(qū)主要有兩組斷裂，分別為北東東向和近南北向。 c.根據(jù)斷裂和含水地層的配置關(guān)系，確定了兩個有利井位。
[Abstract]:Geothermal resources are a new type of green energy, and their exploration and exploitation are paid more and more attention by the state and society. The Changbai Mountain area is rich in geothermal resources, and the Tianchi volcanic Group and Longgang Volcano Group in Changbai Mountain area are famous modern volcanic active areas in China. The deep magma house provides the heat source energy for the geothermal field in this area, and the hot spring has more than 1000 dew points, which has great development potential. The controllable source audio magnetotelluric method is a kind of electromagnetic sounding method for observing the electromagnetic field response excited by artificial field source in the earth. In recent years, CSAMT has been widely used in deep geothermal exploration. The controllable source is studied in this paper. The present situation of audio magnetotelluric method at home and abroad and the basic theory of controllable source audio magnetotelluric method; Then a convenient method of converting Kania apparent resistivity into the whole area resistivity is given, and the electric field forward iteration fitting Kania apparent resistivity is used to carry out near field correction. The contrast analysis shows that the apparent resistivity obtained by this method in the far region is equal to that of Kania resistivity, while the distortion of Kania apparent resistivity is obviously improved in the near and transitional regions. The one-dimensional inversion map based on the whole area apparent resistivity, the one dimensional inversion map based on the Kania apparent resistivity, the one dimensional inversion map of the apparent resistivity using OCCAM method, and the one dimensional inversion map obtained by the direct band source inversion from Kania apparent resistivity are compared. The feasibility of the method is illustrated. Taking the application of controllable source audio frequency magnetotelluric method in the geothermal exploration of a certain area of Songjiang River as an example, the geological and geophysical data of the study area are collected, which are based on the geological data of the study area, gravity, magnetic and hydrological data. Based on the previous peripheral working data, the characteristics of electrical anomaly in the electric inversion section of the study area are analyzed and discussed, and the strata are preliminarily divided according to the characteristics. The research and application of CSAMT method in geothermal exploration of the study area have obtained the following results and understanding:. 1. The whole apparent resistivity obtained by this method is equivalent to Kania apparent resistivity in the far region, and the correction effect of Kania apparent resistivity distortion is very obvious in the near region and transition region. 2. Using the whole area apparent resistivity inversion can directly reflect the vertical variation characteristics of the resistivity of the medium and increase the depth of CSAMT detection. 3. The forward modeling method is simple and fast, and has great application value in practice. 4. The main achievements of the work in the study area are as follows:. A. The study area can be divided into four tectonic layers from surface to underground for 2000 meters. B. it is determined that there are two groups of faults in the study area, which are east-west and north-south respectively. According to the relationship between fault and water bearing formation, two favorable wells are determined.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P631.325

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