Chemical Effects on Chalk Weakning and Fracture Deformation

Steam injection is becoming increasingly used to enhance heavy oil production even in complex reservoirs<br>such as fractured carbonates. However, injecting steam into fractures has the potential to change reservoir<br>permeability because increasing the temperature causes the reservoir rock to expand potentially closing<br>fractures and condensed water may react with the reservoir rock; both processes may increase uncertainty<br>in predicting oil recovery from these reservoirs.