Astronomy and Astrophysics Seminars

Accurate and efficient viscoelastic modelling of Deccan flood basalt

by Mr. Ajay Malkoti (CSIR-National Geophysical Research Institute, Hyderabad)

Friday, January 18, 2019 from to (Asia/Kolkata)
at A269
Description
The Deccan volcanic province in western India, which is covered with flood basalt, has recently captured academic and commercial interest for the possible occurrence of hydrocarbon-bearing sediments underneath it and the possibility of CO2 sequestration in thick basaltic flows. Such complex structure cannot be imaged properly using conventional seismic algorithms. More advanced methods, which are based on full-field numerical simulations, are generally limited in physical description, numerical accuracy, and have high computational cost. I will present my work on the development of a highly accurate and efficient numerical scheme with minimal numerical artefacts, for seismic wave propagation in realistic media. First, the efficiency of the scheme is improved by an order in magnitude using a new vectorized-derivative operator formulation. The derivative operator was used to simulate wave propagation in elastic media and then extended to the viscoelastic case. Second, to mitigate numerical artefacts, an accurate and fast implicit derivative operator (10th order) is also proposed for the simulation. Finally, a real-field application of this technique is demonstrated using the Killari borehole data (located within Deccan volcanic province).