水平井阵列感应测井MIT的正反演研究

发布时间：2018-02-02 04:33

本文关键词： 阵列感应水平井电阻率正反演　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,由于勘探、开发形势的需要,水平井、大斜度井的数量与日俱增。水平井钻井成本大幅降低,甚至接近直井,其产量是直井的3至8倍。相对于直井,水平井增大了储集层面积,增强分散储层的横向连接能力,井眼轨迹能够穿过更多的垂直裂缝,极大地发挥出储层的潜力,弥补垂直井的不足,提高原油的采收率,能比垂直井获取更高的产能。水平井综合设计是由钻井、地质、测井、采油、油藏工程和成本核算员协同工作,共同完成。测井的目的是引导井眼轨迹沿地质模型确定的储集层方向钻进和进行储集层油气评价。对于水平井和大斜度井,地层电各向异性明显,其阵列感应测井响应是全三维数值计算问题,测井响应计算方法和依据测井读数的解释方法不再适用。本论文以MIT阵列感应仪器为研究对象,首先完成正反演研究,其次分析MIT的现场应用,取得成果如下(1)通过对MIT正演的研究得出水平井的阵列感应测井响应特性取决于层厚、电导率对比度、子阵列间距、仪器距层界面距离等多种因素。通过分析涡流和磁场虚部空间分布特性揭示了阵列感应在斜井和水平井中的响应机理。(2)在对水平井反演研究,合理选择地质模型与仪器观测模型参数,借助有限元计算双侧向、双感应响应值,建立测井响应信息库,从而快速预测双感应测井响应及反演模型参数。(3)在实际的现场应用中MIT阵列感应有比常规电阻率仪器更准确、更直观的解释结果,具有较强的划分薄层及反映层内的非均质性能力,能直观合理地描述地层侵入特征和地层真电阻率。
[Abstract]:In recent years, due to the need of exploration and development situation, the number of horizontal wells and large deviated wells is increasing day by day. The drilling cost of horizontal wells is greatly reduced, even close to that of vertical wells, and its output is 3 to 8 times as high as that of vertical wells. Horizontal well increases reservoir area, strengthens horizontal connection ability of dispersed reservoir, and well trajectory can pass through more vertical fractures, greatly exert reservoir potential and make up for the deficiency of vertical well. Improved oil recovery can achieve higher productivity than vertical wells. The integrated design of horizontal wells is coordinated by drilling, geology, logging, oil recovery, reservoir engineering and cost accounting. The purpose of logging is to guide borehole trajectory to be drilled along the direction of reservoir determined by geological model and to evaluate reservoir oil and gas. For horizontal wells and high inclination wells, the formation electric anisotropy is obvious. The array induction logging response is a full three-dimensional numerical calculation problem, and the logging response calculation method and the interpretation method based on logging readings are no longer applicable. This paper takes the MIT array induction instrument as the research object. First, the forward and inverse modeling research is completed, and then the field application of MIT is analyzed. The results are as follows: 1) through the study of MIT forward modeling, it is concluded that the response characteristics of horizontal well array induction logging depend on the formation thickness. Conductivity contrast, subarray spacing. By analyzing the spatial distribution of eddy current and magnetic field virtual part, the response mechanism of array induction in inclined well and horizontal well is revealed. Reasonable selection of geological model and instrument observation model parameters, with the help of finite element calculation of dual lateral and double induction response value, the logging response information database is established. Therefore, the fast prediction of dual induction logging response and inversion model parameters. 3) in practical field applications, MIT array induction is more accurate and more intuitive than conventional resistivity instruments. It has a strong ability of dividing thin layers and reflecting the heterogeneity of the layers, and can describe the formation invasion characteristics and the true resistivity directly and reasonably.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.81;TE243

【参考文献】