Abstract

Detailed structural analysis has been carried out along a regional seismic profile extending to deep water, South of Mumbai High, Western Offshore Basin, India. Qualitative modelling has been attempted by critically evaluating different growth features like progradational wedges/fans and stratal disposition with respect to structural elements. Quantitative structural modelling has been carried out by using Move software to determine regional consistent values for depth to detachment of the fault systems and its implications on crustal extension have been determined in the present study. The analysis has helped out to develop a comprehensive structural model to understand the kinematics and tectonic evolution of the basin. Different extensional structural features such as Basement involved normal faults, Paleocene asymmetric rifts, extensional folding and related structures formed due to propagation of basement faults through variable mechanical stratigraphy of overlying sediments and complex hanging / foot wall deformation have been identified. Seaward Dipping reflectors (SDR) indicating volcanic flows deposited within the rifts bounded by listric faults have also been identified. The structural model proposed in the present study will help to asses the risk involved in hydrocarbon exploration. The quantitative understanding of depth of basal detachments of normal faults at different crustal levels will give insight into the extensional tectonics of western continental margin of India. The present study will aid in developing viable models for deep water exploration.