一幅图像仍然胜过千言万语:使用电子图像、ct扫描和重新审视的方法进行异质性分析

S. Finlay, A. Abu El Fotoh, C. Maeso
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引用次数: 0

摘要

碳酸盐岩储层通常表现出多种非均质性,这使得ERD注水开发变得复杂。碳酸盐岩储层中常见的非均质性之一是成岩作用的发生,不同程度的胶结作用和溶蚀作用可导致复杂的孔喉系统,具有不同比例的原生和次生孔隙。孔喉系统的可变性会导致渗透率的巨大变化,因此对注水开发的成功与否有重大影响。因此,对储层中观察到的孔隙度类型进行表征和量化,可以显著提高渗透率预测、储层表征和储层性能。通过传统的电阻率和中子密度测井来评估孔隙度的经典方法通常缺乏垂直和方位分辨率,无法解决内部岩石结构变异性的复杂性,因此准确的渗透率预测以及与生产数据的协调仍然是难以实现的。在这个案例研究中,我们提出了一种重新审视的方法,利用钻孔图像和整个岩心ct扫描来表征和量化非均质储层的孔隙度类型。该研究的优势在于采用了多口取心井的迭代方法,采用了先进的数据采集技术,提高了向未取心井传播的信心。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An Image Is Still Worth a Thousand Words: Heterogeneity Analysis Using Electrical Images, CT-Scans and a Revisited Methodology
Summary Carbonate reservoirs commonly exhibit a variety of heterogeneities that can complicate ERD waterflood developments. One such heterogeneity that is commonly observed in carbonate reservoirs is the occurrence of diagenesis where varying degrees of cementation and dissolution can result in complex pore throat systems with varying proportions of primary and secondary porosities. The variability in pore throat systems can result in large variations in permeability and therefore have significant impact on the success of a waterflood development. Therefore characterizing the type of porosity and quantifying the types of porosity observed in the reservoir can lead to significant improvements in permeability prediction, reservoir characterisation and reservoir performance. Classical methods of porosity evaluation through traditional resistivity and neutron-density logs usually lack the vertical and azimuthal resolution to address such complexities in the internal rock fabric variability, and therefore accurate permeability predictions and reconciliation with production data remain elusive. In this case study we present the application of a revisited methodology for the characterisation and quantification of porosity types in heterogeneous reservoirs using borehole images, and whole core CT-Scans. The strength of the study is the iterative approach across multiple cored wells with advanced data acquisition, improving the confidence of propagation to uncored wells.
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