We will present a value chain management model for liberalized natural gas markets. The model describes the integrated planning problem of a natural gas producer including production, transportation, storage and contract management. The decision horizon is normally between 18 months and three years. The capacities of the production fields and the transportation pipeline system limits the gas volumes delivered in the downstream markets. Demand is represented by contracts and spot markets. Contract volumes as well as spot prices are uncertain. The model is implemented as a mixed integer multistage stochastic model. Scenario trees are generated by moment matching. Preliminary results from pilot tests on Statoil's operations on the Norwegian continental shelf will be presented.