Abstract

Ravva is a mature oil and gas field in K-G Basin, discovered in 1987 and brought into production in 1993. Ravva field is being developed under waterflood, which has undergone various drilling phases and has achieved a recovery factor of 50% over a span of 24 years. The Middle Miocene (MM) sands form the key reservoir has been thoroughly exploited. These MM sands were deposited in shoreface to deltaic settings and are represented by thick connected sands. MM sands are later eroded by a major unconformity LLMSB (Lower Late Miocene Sequence Boundary) following which a deep sea environment was followed during which some canyon cuts and slope channel complexes are deciphered. LLM sands are deposited during this time encased within thick LLM shale sequence and ranges in thickness between 3-15m, charging of these sands are through faults and sealing of reservoir (both top and lateral seal) are through shale boundaries. All the development/infill wells drilled till date have been optimized for exploiting MM sands, however some have encountered hydrocarbons at shallower LLM stratigraphic levels.