Cooperative inversion of seismic reflection and gravity data: An object-based approach

摘要

Reflection seismic is extensively used in hydrocarbons prospection due to the much higher resolution of seismic data compared to other geophysics methods. However, seismic reflection is often distorted by complex salt bodies and other geological structures and its vertical resolution is often of the order of dozens of meters. An alternative to improve the vertical resolution is to combine seismic imaging with gravity data, because it offers an additional source of information for the position of salt domes. To address the problem of distortion of seismic data due to complex salt bodies and lower resolution of gravity anomaly data, we developed a 2D cooperative inversion of migrated post-stack seismic reflection and gravity data for complex geological structures. The method incorporates a technique to decrease the number of variables and our cooperative inversion is solved by optimization of the gravity inverse problem, thus reducing computing time. Our cooperative inversion is efficiently demonstrated using a synthetic model calculated from the Benchmark BP 2004 that represents an offshore sedimentary basin containing salt bodies and small hydrocarbons reservoirs. The results demonstrate the potential of our cooperative inversion approach to reconstruct salt bodies compared to single domain inversions. (C) 2019 Elsevier B.V. All rights reserved.