Development of a rule based model to predict CO2 storage stability in geological sites using logical analysis of data

• Main Authors: Estrada, Aeron, Luychinco, Wynne Caira, Ouyang, Janesa Kaylin, Yu, Jyllian Reine
• Format: text
• Language: English
• Published: Animo Repository 2023
• Subjects: Carbon sequestration; Chemical Engineering; Engineering
• Online Access: https://animorepository.dlsu.edu.ph/etdb_chemeng/28; https://animorepository.dlsu.edu.ph/context/etdb_chemeng/article/1025/viewcontent/Development_of_a_Rule_Based_Model_to_Predict_CO2_Storage_Stabilit_copy.pdf
• Institution: De La Salle University

Given the increasing amount of CO2 in the air, carbon sequestration underground in geological formations has become a necessity. The geological storage sites need to be secure to prevent the CO2 stored from leaking out and entering the atmosphere further contributing to the increase of greenhouse gases. However, site testing is expensive, inefficient and also poses a risk to human health. As such, Machine Learning (ML) techniques were utilized to analyze the data and transform the data into a model with the given information. In this study, the ML technique used was the Logical Analysis of Data (LAD), wherein the security of a storage site was evaluated using a set of significant attributes. Only selected quantitative attributes were considered: Depth, pressure, temperature, CO2%, CO2 density, reservoir thickness, seal thickness, and fault. LAD was used to determine the essential storage attributes, and Waikato Environment for Knowledge Analysis (WEKA) an entropy-based algorithm, determined the important attribute ranges. The LAD method was applied to three different sets of rule models, which were the single rule, multiple rules, and K-fold method. Using a dataset of 76 samples with 30 used for training and 46 for validation, the best performing model was the single rule model which resulted in 0% false positive and 46.81% not classified during training, and 0% false positives and 44.83% not classified during validation. The important attribute in determining storage security was pressure with a range of 15.92 MPa – 30.94 MPa, which further verified theory and past studies.