ANALYSIS OF CONDUCTIVE LAYERS ON ROCK ELECTRICAL CONDUCTIVITY USING THE FINITE ELEMENT METHOD

• Main Author: Oktaviani, Rini
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/84559
• Institution: Institut Teknologi Bandung

High electrical conductivity zones pose challenges in interpreting hydrocarbon zones. Several factors contribute to the occurrence of these high conductivity zones, one of which is the presence of conductive minerals such as iron oxides. In this study, rock modeling was performed considering the presence of magnetite in the form of cracks and hematite in a spherical shape. The conductivity of the rock was calculated using the finite element method (FEM). The sample used in this study was 100³ voxels in size. Before calculating the conductivity of the model, FEM conductivity results were compared with several simple models, such as a chessboard model, cubic inclusions, and models with 1 and 2 cracks. The comparison results between FEM conductivity and analytical formulations showed that FEM successfully estimated conductivity with good accuracy, indicated by an error value of < 5%. The conductivity results in the geometric model were influenced by the crack fraction and crack connectivity. Meanwhile, in the model with spherical grains, the rock conductivity was more influenced by hematite conductivity when the rock porosity was low. This is because rocks with low porosity have less space for fluid storage.