Strategy for optimizing geophysical deployment: Case study of an HVA drilling project in the Kong bedrock environment

This study aims to develop a strategy for optimizing the selection of geophysical sites for HVA drilling in the bedrock area of Kong. To achieve this objective, the methodology first consisted of extracting the fracture network from satellite image processing. Then, surveys and electrical drags were used to characterize the geometry of the fractured aquifers (the depths of the aquifer zones and the fracturing indices of the conductive anomalies). The conductive anomalies K, H, U, and V were identified by electrical drags and intersected the fractures determined by processing Landsat 7 ETM+ satellite images. In addition, the fracturing index ranges from 1.96 to 2.57. The corrected cumulative lengths of the fractures range from 362.92 m to 835.46 m. Interpretation of the borehole curves showed 4 to 5 aquifer zones in the subsoil. Finally, combining the fracturing index, the depth of the aquifer zones, and the length of the fractures resulted in the following drilling priority order: K (F1), U (F2), V (F3), and H (F4) (K > U > V > H).