Automated Workflow for the Detection of Vugs

TL;DR

This paper presents an automated computer vision-based model for detecting and characterizing vugs in formation micro imager logs, improving accuracy and efficiency over manual methods for reservoir analysis.

Contribution

It introduces a novel six-step vug detection methodology and statistical analysis framework, enhancing vug identification and characterization in geological formations.

Findings

Model accurately identifies vugs missed by experts

Provides detailed vug area distribution metrics

Improves efficiency over manual and semi-automated methods

Abstract

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.