Joint PP-PS Inversion with Registration Optimisation to Improve Geological Knowledge of a Deep-Water Field West Africa

Summary Inversion has become the standard procedure to quantify elastic properties using seismic. PP seismic is commonly used for this purpose, but in areas where PP seismic is affected by gas pockets or mud volcanoes, the reflectivity can be compromised for reservoir characterization. PP-PS inversion can step in to improve the determination of elastic properties when PP seismic inversion alone is challenging. However, the biggest challenge of this multi-component inversion lies in the registration between PP and PS information. This abstract illustrates the application of PP-PS elastic inversion using an improved technique that includes an innovative correction of travel time to rectify for residual time registration. This case study from a deep-water field in West Africa was carried out on acquired ocean-bottom nodes (OBN) dataset. The seismic preconditioning, PP inversion, registration approach and the implementation of the advanced PP-PS inversion helped in the better characterisation of elastic properties of the reservoir.