| Abstract Submission No. | ABS-2.4-0018 |
| Title of Abstract | Integrated AVA analysis and Seismic Inversion methods for fluid identification |
| Authors | Shashwat Raj Mishra* |
| Organisation | IIT ISM Dhanbad |
| Address | Indian Institute of Technology (Indian School of Mines) Dhanbad Dhanbad, Jharkhand, India Pincode: 826004 E-mail: 23mc0084@iitism.ac.in |
| Country | India |
| Presentation | Poster |
| Abstract | Accurate and efficient characterization of hydrocarbon reservoirs is essential for responsible resource management and sustainable development. Conventional post-stack inverted volumes alone often lacks detailed lithological and fluid-fill information necessary for robust reservoir delineation. Prior studies of the Mississauga sands highlight the need for multi-attribute analysis. This study presents a comprehensive and integrated workflow that combines AVA analysis from 3D PSTM angle gathers, deterministic post-stack band-limited impedance inversion and pre-stack simultaneous inversion using simulated annealing to identify gas bearing sands in Mississauga Formation in the Scotian Basin. The Simulated annealing algorithm iteratively perturbs P- and S-impedance models to minimize the misfit between synthetic and observed data, with constraints provided by low-frequency impedance models derived from logs. The derived elastic parameters are then used to calculate the Vp/Vs ratio, lambda-mu, which are highly sensitive parametres to fluid content providing clear distinction between gas-filled and wet sands. This integrated approach improves fluid indicators and, when combined with multi-attribute analysis, enhances understanding of lateral and vertical fluid distribution enabling more accurate fluid maps and reduced exploration uncertainty, which benefits seismic exploration and interpretation. |
| Keywords | AVA, Post-Stack Inversion, Pre-Stack Inversion, Simulated Annealing, Fluid Identification |