Abstract

The basement of Cauvery Basin had been affected by a two phase deformation during Pre Cambrian leading to development of E-W oriented shear zones. Based on morphotectonics, field data, image analysis and collateral data, a modeland map of the shear zone affected basement has been attempted. These zones had been interpreted to occur as individual bands of 250m to 400m thick, continuous from the basin boundary to offshore causing intense fracturing near basement top. Further episodes of tectonism during Phanerozoic affecting the basement had caused further fracturing of it. GIS based superposition of the high density areas of interpreted Post Pre-Cambrian fracturing on the interpreted shear zones produce zones of maximum fracture porosity. These fractured areas found associated with geomorphic highs that are considered to be manifestations of isolated basement highs and also occurring over or in proximity to source pods can be defined as promising areas of basement exploration. The E- W and NW-SE faults may have probably played a significant role in charging the basement reservoirs