本文關鍵詞： 頁巖 復電阻率 相位 總有機碳 黃鐵礦　出處：《長江大學》2015年碩士論文　論文類型：學位論文

【摘要】：近年來,隨著勘探和開發(fā)技術的不斷提高,頁巖氣等非常規(guī)能源資源逐漸進入人們的視野。頁巖氣作為非常規(guī)能源,其是保留在生油巖層中的天然氣,它既是常規(guī)天然氣的潛在替代能源,也是清潔環(huán)保能源,因此一場由頁巖氣引發(fā)的“革命”正在火熱的進行之中。目前對頁巖氣進行商業(yè)開發(fā)的國家主要有美國和加拿大,其中尤以美國成績突出。我國頁巖氣資源潛力巨大,南方海相富有機質頁巖儲集層為最主要富集區(qū)。據估計我國頁巖氣資源量與美國大致相當,但由于我國地域遼闊造成地表條件的復雜多樣性極大地限制了地震勘探技術在頁巖氣勘探中的運用。因此基于上述問題筆者從富有機質頁巖的巖石物理特性(復電阻率特性)出發(fā)進行相關研究分析,主要從①頁巖標本采集；②復電阻率測試分析；③激電機理研究；④勘探方法選擇等方面進行論述。作者在收集和分析相關研究資料的基礎上研制了一套適合頁巖復電阻率測試的實驗裝置,測量儀器采用進口的SI1260阻抗分析儀,對采集的富有機質頁巖樣品在常溫常壓下進行復電阻率掃頻測量。運用眾復電阻率電模型對測量數據進行反演分析研究。選擇的導電模型有：①單Cole-Cole;②雙Cole-Cole;③Cole-Cole乘Brown;④Dias模型。分別選用以上模型對大量實測復電阻率幅值以及相位參數進行聯合反演,其結果顯示雙Cole-Cole模型相對于其他模型具有較小擬合誤差,能夠較好地描述富有機質頁巖巖芯的復電阻率以及相位曲線,且能從反演結果中較準確地得到各頻譜參數。總有機碳含量(TOC)是評價頁巖儲層的重要參數之一。地質沉積理論研究表明,深水沉積環(huán)境下海相沉積物中控制黃鐵礦形成的基本因素是有機質含量,這種環(huán)境中有機碳和黃鐵礦存在一定相關性。通過分析大量巖樣的實測TOC含量、黃鐵礦含量,其分析結果也與上述地質沉積理論一致。并根據富有機質頁巖的TOC含量、黃鐵礦含量以及反演得到的極化率參數之間的對應關系推斷：富有機質頁巖中黃鐵礦的存在是引起其激發(fā)極化效應的重要因素。最后總結出我國南方海相富有機質頁巖儲層相對于圍巖具有低電阻率、高極化率的異常特征。以室內巖石物理分析為基礎,在巖芯采集區(qū)選擇頻譜激電法(CR)進行頁巖氣初探,得到的反演剖面與室內物性分析結果具有較好的一致性。最終筆者希望本文對時頻電磁勘探技術(TFEM)或頻譜激電法(CR)等電磁勘探技術作為地震勘探技術的重要輔助手段來預測頁巖氣“甜點區(qū)”以及頁巖氣復電阻率測井方法的實現都具有重要的指導與借鑒意義。
[Abstract]:In recent years, with the continuous improvement of exploration and development technology, unconventional energy resources, such as shale gas, have gradually come into people's view. As an unconventional energy, shale gas is natural gas retained in oil source rocks. It is both a potential alternative to conventional natural gas and a clean and environmentally friendly energy source, so a "revolution" caused by shale gas, which is being commercially exploited in the United States and Canada, is under way. Especially in the United States, the potential of shale gas resources in China is huge, and the marine organic rich shale reservoirs in the south are the most important rich areas. It is estimated that the amount of shale gas resources in China is about the same as that in the United States. However, the application of seismic exploration technology in shale gas exploration is greatly limited due to the complex diversity of surface conditions caused by the vast territory of China. Therefore, based on the above problems, the author proceeds from the rock physical characteristics of organic shale (complex). Electrical resistivity characteristics), This paper mainly discusses the selection of exploration methods from the measurement of complex resistivity of No. 1 shale specimen collection and the analysis of the electrical mechanism of the third rock. On the basis of collecting and analyzing the relevant research data, the author has developed a set of suitable for shale reelectricity. An experimental device for resistance testing, The measuring instrument adopts the imported SI1260 impedance analyzer, The complex resistivity sweep frequency measurement of the collected organic shale samples was carried out at room temperature and atmospheric pressure. The multiple complex resistivity electrical model was used to study the inversion analysis of the measured data. The selected conductive model is: 1 single Cole-Cole-Coleo 2 double Cole-Cole-Cole 3Cole-Cole multiplied Brownz4Dias model. A large number of measured complex resistivity amplitudes and phase parameters are inversed by the above models, respectively. The results show that the double Cole-Cole model has a smaller fitting error than other models, and can describe the complex resistivity and phase curves of organic shale cores. The total organic carbon content (TOC) is one of the important parameters in the evaluation of shale reservoir. The basic factor controlling pyrite formation in marine sediments in deep-water sedimentary environment is the content of organic matter. There is a certain correlation between organic carbon and pyrite in this environment. By analyzing the measured TOC content of a large number of rock samples, the content of pyrite is determined. The analytical results are also consistent with the above-mentioned geological and sedimentary theories, and based on the TOC content of organic shale, The relationship between pyrite content and polarizability parameters obtained by inversion inferred that the existence of pyrite in organic shale is an important factor causing its induced polarization effect. Finally, the rich marine mechanism in southern China is summarized. Shale reservoir has low resistivity relative to surrounding rock. On the basis of indoor rock physical analysis, the shale gas was studied by using the spectrum IP method (CRS) in the core acquisition area. The obtained inversion profiles are in good agreement with the results of indoor physical properties analysis. Finally, the author hopes that the electromagnetic exploration techniques such as time-frequency electromagnetic exploration technology (TFEMM) or spectral IP method (CR-R) can be used as an important assistant to seismic exploration technology. It is of great significance to predict the "desserts" of shale gas and the realization of shale gas complex resistivity logging.
【學位授予單位】：長江大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13;P631.3

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本文編號：1525290