Abstract

Cauvery Basin, a peri-cratonic rift basin, located at the eastern coast of India, with 8-9 km of sediment deposits, has a significant/proven hydrocarbon deposit in its Onland fields, producing not only from the conventional Cretaceous and Tertiary reservoirs but also from unconventional Fractured Basement reservoir. Apart from the Onland fields, numerous HC discoveries have been made in the shallow offshore areas like PY-1 and PY-3 fields, currently the efforts are focused towards exploration of these plays into further offshore areas of Deep and UltraDeepwater areas of Cauvery Basin. In this paper, a 2D Petroleum Systems Modeling (PSM) for the offshore extension of Ariyalur-Pondicherry sub basin is attempted to study its hydrocarbon generation, expulsion and the associated migration pathways. Temperature, Maturity and Boundary conditions of the model were calibrated from the 1D PSM generated for a well located in proximity to the profile. Scenario testing with opening and closing of faults were performed to determine their behavior. The simulated model was used for analyzing the maturity of the late Jurassic, Barremian, Mid-Aptian, Aptian, Albian and Turonian source rocks, the timing of expulsion along with migration pathways of the generated hydrocarbon.