南方富有机质页岩复电阻率测试分析与激电机理研究

发布时间：2018-02-22 20:56

本文关键词： 页岩复电阻率相位总有机碳黄铁矿　出处：《长江大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,随着勘探和开发技术的不断提高,页岩气等非常规能源资源逐渐进入人们的视野。页岩气作为非常规能源,其是保留在生油岩层中的天然气,它既是常规天然气的潜在替代能源,也是清洁环保能源,因此一场由页岩气引发的“革命”正在火热的进行之中。目前对页岩气进行商业开发的国家主要有美国和加拿大,其中尤以美国成绩突出。我国页岩气资源潜力巨大,南方海相富有机质页岩储集层为最主要富集区。据估计我国页岩气资源量与美国大致相当,但由于我国地域辽阔造成地表条件的复杂多样性极大地限制了地震勘探技术在页岩气勘探中的运用。因此基于上述问题笔者从富有机质页岩的岩石物理特性(复电阻率特性)出发进行相关研究分析,主要从①页岩标本采集；②复电阻率测试分析；③激电机理研究；④勘探方法选择等方面进行论述。作者在收集和分析相关研究资料的基础上研制了一套适合页岩复电阻率测试的实验装置,测量仪器采用进口的SI1260阻抗分析仪,对采集的富有机质页岩样品在常温常压下进行复电阻率扫频测量。运用众复电阻率电模型对测量数据进行反演分析研究。选择的导电模型有：①单Cole-Cole;②双Cole-Cole;③Cole-Cole乘Brown;④Dias模型。分别选用以上模型对大量实测复电阻率幅值以及相位参数进行联合反演,其结果显示双Cole-Cole模型相对于其他模型具有较小拟合误差,能够较好地描述富有机质页岩岩芯的复电阻率以及相位曲线,且能从反演结果中较准确地得到各频谱参数。总有机碳含量(TOC)是评价页岩储层的重要参数之一。地质沉积理论研究表明,深水沉积环境下海相沉积物中控制黄铁矿形成的基本因素是有机质含量,这种环境中有机碳和黄铁矿存在一定相关性。通过分析大量岩样的实测TOC含量、黄铁矿含量,其分析结果也与上述地质沉积理论一致。并根据富有机质页岩的TOC含量、黄铁矿含量以及反演得到的极化率参数之间的对应关系推断：富有机质页岩中黄铁矿的存在是引起其激发极化效应的重要因素。最后总结出我国南方海相富有机质页岩储层相对于围岩具有低电阻率、高极化率的异常特征。以室内岩石物理分析为基础,在岩芯采集区选择频谱激电法(CR)进行页岩气初探,得到的反演剖面与室内物性分析结果具有较好的一致性。最终笔者希望本文对时频电磁勘探技术(TFEM)或频谱激电法(CR)等电磁勘探技术作为地震勘探技术的重要辅助手段来预测页岩气“甜点区”以及页岩气复电阻率测井方法的实现都具有重要的指导与借鉴意义。
[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.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.3

【参考文献】