Madanam field in Cauvery basin in the east coast of India, has fractured gneissic basement. As exploration focus moved to unconventional reservoirs, the gneissic basement of Madanam was seen as a potential reservoir. However, ambiguity existed about the fluid flow through the basement. For example, in Madanam field, one well (well A) flowed whereas another well (well B) located 8.5 km away had minor flow from the basement reservoir that lasted 2 days. The main purpose of this study was to find possible reasons for this anomalous behavior. This study was conducted by integrating sonic and image measurements with a geomechanics workflow to identify critically stressed open fractures. Further, this work aims to provide a fit-for-purpose solution to optimize and prioritize testing zone selection in near real time.
Padra Field, located in the eastern margin of south Cambay Basin, India is known for oil and gas production from unconventional fractured basaltic Deccan Trap. Earlier studies of Padra Trap showed moderately weathered basalt as the reservoir rock. However a thorough study integrating core and high resolution image log for characterizing the volcanic reservoir was yet to be ventured. Fracture modeling on PETREL™ platform was attempted using point data from wells and the resultant model was found to be in agreement with production data from wells. Difficulties faced during fracture coding based on FMI™ data owing to highly scattered fracture dip azimuths necessitated the present study to integrate FMI™ with core data.
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