Wow, such good English in Gazprom, I impressed. This world is really changing
So, when we talk about Gazprom reservoirs first of all you must check production history, because recovery may be underestimated/overestimated. And all stimulation methods require sufficient reserves to prove them.
Carbonate reservoirs are always naturally fractured so they are subject of geomechanics, i.e. the most of fractures initially produced now are closed. That is why recovery from carbonate reservoirs is always lower then sandstones one.
There are two possible ways for stimulation:
1. Cheap and simple – massive acidizing with formation of wormholes and fractures.
2. Expensive and time consuming – hydraulic fracturing with large propped fracture.