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首页> 外文会议>SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition >Examining Heterogeneity based on the Computerized Tomography Imaging
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Examining Heterogeneity based on the Computerized Tomography Imaging

机译：基于计算机断层扫描成像检查异质性

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Core analyses are carried out on the selected rock samples with the aim of establishing the basis of the building a data base to provide direct and quantitative measurements and interpretations about the reservoir characteristics. During a careful sample selection process, besides available conventional data such as porosity and permeability it is also important to understand the degree of heterogeneity that exists within the core samples. Computerized Tomography (CT) scanning technique, in this respect, has efficiently been used due to its non-destructive cross sectional imaging capability. CT scanning images obtained by medical type CT scanners are reconstructed on a 512x512 grid of pixels, with a typical resolution of 50 to 300?m depending on the sample size. Since the CT numbers are based on the density within rock samples, the heterogeneity analysis based on the CT numbers reflects the lithology of the samples being examined. Therefore, understanding the statistics of the CT images can significantly contribute towards an accurate classification and improved sample selection of the rock samples into different level of heterogeneities/homogeneities, which in turn significantly contributes towards the success of specialized studies, e.g. SCAL tests, Enhanced Oil Recovery and Acid Treatment. To examine the level of heterogeneity of rock samples on the basis of CT numbers, this study focuses on the application of statistical parameters, including Coefficient of Variation (CV) and Heterogeneity Index (HI) as well as histogram. The results indicated that only visual examination of CT images are not adequate but more thorough examination, such as statistical methods are required and have been proven to be an effective approach.
机译：核心分析是在所选择的岩石样本上进行，目的是建立建设数据库的基础，以提供关于储层特征的直接和定量测量和解释。在仔细的样本选择过程中，除了可用的常规数据之外，诸如孔隙度和渗透率之类的传统数据，了解核心样品内存在的异质性程度也很重要。在这方面，计算机断层扫描（CT）扫描技术由于其非破坏性横截面成像能力而有效地使用。 CT扫描通过医疗型CT扫描仪获得的图像在像素512x512网格上重建，典型分辨率为50至300Ωm，取决于样本大小。由于CT编号基于岩石样本内的密度，因此基于CT号的异质性分析反映了所检查样品的岩性。因此，理解CT图像的统计可以显着促进准确的分类和改进的岩石样品的样本选择成不同水平的异质性/均匀性，这反过来显着促进了专业研究的成功，例如，批次试验，增强的采油和酸治疗。为了在CT号的基础上检查岩石样本的异质性水平，本研究侧重于统计参数的应用，包括变异系数（CV）和异质性指数（HI）以及直方图。结果表明，只有CT图像的视觉检查不足，但更彻底的检查，例如需要统计方法，并已被证明是一种有效的方法。

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