Abstract

The well complications in the form of extreme mud loss in exploratory wells AT of Tripura Fold Belt and KS of Krishna Godavari Basin were subjected to detailed G&G analysis. Resistivity image log of well AT revealed the presence of two thrust faults and a severe break out zone which was not evident in the corresponding 2D seismic section due to poor sub surface image in the structure. Severe mud loss had encountered in Lower Bhuban Formation in well AT and which was analysed in resistivity image log and corroborates with the identified break out zone. Similarly in well KS the seismic sections were revisited post drilling and it was observed that the extreme mud loss sections were in proximity of zone of fault intersection. In the area where two faults would intersect, difference between two horizontal stresses would be maximum and more likely to induce break out.