Discovery wells in low matrix permeability fractured reservoirs often flow well, however making further appraisal or development decisions is usually difficult. This is because of the heterogeneous nature of fractured reservoirs, which makes sweetspot prediction more of a challenge than in conventional reservoirs. Limited or poor quality data compounds the problem.

Faced with this situation, our experience suggests that evaluation of discovery well results should include assessment of the relationship between fracture orientation and the in-situ stress field. Fractures, which are critically oriented with regard to the in-situ stress field, are most likely to have a commercially attractive permeability (see Stress Criticality of Fractures). We can help you develop the correct well trajectory for maximising the chances of intersecting these permeable features in your next well.