Abstract

Identification of the sealing characteristics of faults is crucial in making decisions at hydrocarbon exploration, appraisal and development stages. Keeping in view the importance of fault seal and seal integrity, two main faults of Jambusar field, Cambay basin, compartmentalising the field in different blocks, were evaluated by conventional fault seal and geomechanical analyses. The faults analysed show sealing behaviour based on observable high average shale gouge ratio values (>25%). Fault reactivation study by geomechanical modelling method suggests that fault membrane seal and top seal are stable under the present stress regime and an additional pore pressure of >100ksc may be required to reactivate the faults. The information about seal integrity of the faults could be very helpful in devising exploration and development strategy in Jambusr field.