The Pennsylvania-based producer will leave Louisiana where profiting from tight-gas fields has proven difficult and focus on its legacy assets in the Marcellus Shale. The first of three major unconventional developments in Saudi Arabia has been given the green light. The project will underpin the country's goal to become a top gas exporter by 2030. Understanding petrophysical properties well enough to make drilling decisions, particularly for tight gas can be a challenge. A new computer system aims to help analyze the extensive data involved.