Figure 2. Structural elements of the Sirt Basin, showing oil and gas fields, areas of study, and location of wells with total depths exceeding 12,000 ft in the areas of study. The approximate size of the Sirt Basin areas of study are Ajdabiya trough, 8,500 km2; Maradah graben, 10,000 km2; and South Zallah trough–Tumayam trough, 25,000 km2.