Proceedings [EAGE Publications BV Second EAGE/SPE/AAPG Shale Gas Workshop in the Middle East - Dubai, United Arab Emirates (2014.09.21-2014.09.24)] Second EAGE/SPE/AAPG Shale Gas Workshop in the Middle East - Fracture Modes in the Silurian Qusaiba Shale Play, Northwest Saudi Arabia and their Geomechanical Implications