Abstract

This study presents a comprehensive seismicdriven 3D Mechanical Earth Model (3D-MEM) developed for the structurally complex Mandapeta Play in Mandapeta Field of the KGPG, Basin, characterized by faulted reservoirs and geomechanical heterogeneity. Traditional 1D-MEMs, while useful, are limited in addressing lateral variations in stress and elastic properties. To overcome these limitations, a 3DMEM framework was constructed and calibrated using seismic inversion, petrophysical modeling, and well-based mechanical data. A detailed 3D geological model was built using seismic interpretation and formation tops. Elastic and strength parameters—such as Young’s modulus, Poisson’s ratio, UCS, friction angle, and pore pressure—were derived from pre-stack seismic inversion and calibrated with 1D well log data. Dynamic elastic parameters were converted to static values using lab (triaxial) tests and field calibration from 1D-MEMs. Seismic inversion was performed in multiple time windows, yielding high-resolution P- and Simpedance volumes and a calibrated density model. The final seismic-derived elastic volumes showed good correlation with measured log data, indicating high inversion reliability. Finite Element simulation was employed to compute the magnitude and orientation of the three principal stresses, resulting in a spatially heterogeneous insitu stress and pore pressure field. The validated 3D-MEM accurately predicted observed wellbore events and enabled the generation of continuous 3D volumes of Pore pressure, Fracture pressure, and Mud weight windows. This model provides a critical tool for Geo-mechanical risk screening, Wellbore stability assessment, Mud weight optimization, Fracture design and Stimulation planning. The study significantly enhances well planning, safety, and cost-efficiency in the exploration and development of hydrocarbon resources in geologically complex area.