* During the Late Jurassic and Early Cretaceous, thermal subsidence of the basin center and relatively high sea level formed extensive carbonate platforms along the basin margin and sediment starvation of the basin center. Organic-rich, oil-prone marine sediments were deposited within low-oxygen environments of this sediment-starved basin. These rocks later became the primary source of oil and gas—some of which migrated to and is stored within porous zones of the carbonate platforms. | * During the Late Jurassic and Early Cretaceous, thermal subsidence of the basin center and relatively high sea level formed extensive carbonate platforms along the basin margin and sediment starvation of the basin center. Organic-rich, oil-prone marine sediments were deposited within low-oxygen environments of this sediment-starved basin. These rocks later became the primary source of oil and gas—some of which migrated to and is stored within porous zones of the carbonate platforms. |