用计算机视觉自动识别岩心图像中的溶洞,提升储层评估效率。
Automated Workflow for the Detection of Vugs
- 六步流程自动提取溶洞特征,结合自适应阈值与轮廓分析。
- 相比人工标注,模型识别出更多漏检溶洞,准确率显著提升。
- 适合地质工程师、油藏研究人员快速分析溶洞分布特征。
图像测井对获取地下地层的高质量地质信息至关重要。在形成微成像测井中,溶洞是储层评价的关键地质特征。本文提出一种自动化溶洞检测模型,利用先进的计算机视觉技术,简化溶洞识别流程。传统人工与半自动方法受限于主观偏差、劳动强度高及参数调优灵活性差。本方法引入溶洞特征的统计分析,通过逻辑文件提取与归一化预处理,确保数据标准化。六步溶洞识别流程包括:top-k 模式提取、自适应阈值、轮廓识别、聚合、高级滤波及可选的低溶洞区滤波。模型展现出良好适应性,成功识别出专家人工标记遗漏的溶洞。通过与专家标注对比验证,模型准确性得到证实。引入溶洞面积的计数、均值与标准差等详细指标,展示其优于人工的方法。溶洞面积分布图有助于理解储层中溶洞类型。该研究聚焦于溶洞的识别与表征,从而深化对储层的理解。
原文摘要 · Abstract (English)
Image logs are crucial in capturing high-quality geological information about subsurface formations. Among the various geological features that can be gleaned from Formation Micro Imager log, vugs are essential for reservoir evaluation. This paper introduces an automated Vug Detection Model, leveraging advanced computer vision techniques to streamline the vug identification process. Manual and semiautomated methods are limited by individual bias, labour-intensity and inflexibility in parameter finetuning. Our methodology also introduces statistical analysis on vug characteristics. Pre-processing steps, including logical file extraction and normalization, ensured standardized and usable data. The sixstep vug identification methodology encompasses top-k mode extraction, adaptive thresholding, contour identification, aggregation, advanced filtering, and optional filtering for low vuggy regions. The model's adaptability is evidenced by its ability to identify vugs missed by manual picking undertaken by experts. Results demonstrate the model's accuracy through validation against expert picks. Detailed metrics, such as count, mean, and standard deviation of vug areas within zones, were introduced, showcasing the model's capabilities compared to manual picking. The vug area distribution plot enhances understanding of vug types in the reservoir. This research focuses on the identification and characterization of vugs that in turn aids in the better understanding of reservoirs.
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