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首页> 外文会议>Society of Petroleum Engineers Annual Technical Conference >New Analytical Method to Calculate Matrix-and Fluid-Corrected Total Porosity in Organic Shale
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New Analytical Method to Calculate Matrix-and Fluid-Corrected Total Porosity in Organic Shale

机译：新的分析方法计算有机页岩中的矩阵和流体校正总孔隙度

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Estimation of total porosity from neutron and density porosity logs in organic shale(source rock)is challenging because these logs are substantially affected by fluid and matrix-composition effects. Conventional interpretation of neutron and density porosity logs often includes corrections for shale concentration in which the main objective is to improve the calculation of non-shale porosity in hydrocarbon-bearing zones.Neutron and density porosity readings across shale zones are typically averaged using the root-mean-square(RMS)method. We introduce a new and simple analytical expression for total porosity that effectively separates both matrix and fluid effects on neutron and density porosity logs.The expression stems from a new nonlinear mixing law for neutron migration length that is coupled with the linear density mixing law to calculate total porosity and fluid density.The method is applied in two sequential steps:first,separate corrections for only matrix effects are implemented to enhance the neutron-density crossover for qualitative inter-pretation of fluid type.Next,the coupled equation is used to estimate fluid density and actual porosity devoid of matrix and fluid effects.Calculated porosity and fluid density can be further used to calculate water saturation from density logs.One remarkable feature of this method is the ease with which it can be applied to obtain accurate and reliable results.Application of the method only requires knowledge of single-component nuclear properties and mineral volumetric concentrations.Nuclear properties can be obtained from a set of charts for multiple fluid types and minerals provided in this paper,while mineral concentrations can be calculated based on available triple combo logs or gamma-ray spectroscopy logs. Two synthetic and four field examples(two conventional and two shale-gas reservoirs)are used to test the method.Firstly,we describe an application in a conventional siliciclastic sedimentary sequence where only shale concentration calculated from gamma-ray logs is required to improve the estimation of porosity in shaly sections.Second,we document several applications in which gamma-ray spectroscopy logs are used together with a reliable hypothesis for clay type to define mineral properties.Results compare well to NMR and core measurements,and the new method outperforms the conventional RMS procedure, especially in the cases of gas-bearing,low-porosity organic shale.The new analytical method can be readily implemented on an Excel spreadsheet and requires minimal adjustments for its implementation.
机译：有机页岩（源岩）中中子和密度孔隙率的总孔隙率的估计是具有挑战性的，因为这些日志基本上受流体和基质组成效应的影响。中子和密度孔隙率的常规解释通常包括页岩浓度的校正，其中主要目的是改善含烃地区的非页岩孔隙率的计算。通常使用root平均跨越页岩区的含烃地区的非页岩孔隙率的计算。平均方形（RMS）方法。我们引入了一种新的和简单的分析表达，用于总孔隙率，有效地将矩阵和流体效应分离在中子和密度孔隙率原影上。表达源于与线性密度混合规律偶联的中子迁移长度的新的非线性混合规律源自用于计算总孔隙率和流体密度。该方法以两个顺序步骤应用：首先，实现仅用于矩阵效应的单独校正以增强流体类型的定性防伪中的中子密度交叉.Next，耦合方程用于估计流体密度和实际孔隙率缺乏基质和流体效应。可以进一步使用孔隙率和流体密度来计算来自密度的饱和度。该方法的显着特征是可以应用其获得准确可靠的结果的容易性。该方法的应用只需要了解单组分核属性和矿物体积浓度终点。可以从本文提供的多种流体类型和矿物的一组图表中获得尼核属性，而矿物浓度可以基于可用的三个组合日志或伽马射线光谱测量来计算。使用两个合成和四个现场示例（两个常规和两个页岩气储层）用于测试该方法。首先，我们描述了一种以常规的硅淤积沉积序列施用，其中仅需要从伽马射线测量计算的页岩浓度来改善纹理孔隙率估计。第二种应用，我们记录了几种应用，其中伽皮射线光谱测量与粘土类型可靠的假设一起使用以定义矿物特性。结果比较NMR和核心测量，并且新方法比较常规RMS程序，尤其是在含气的情况下，低孔隙度有机页岩。在Excel电子表格上可以容易地实施新的分析方法，需要对其实施进行最小的调整。

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