sentences:  Bureau and Saudi Aramco researchers conducted a high-resolution LIDAR survey of Middle Jurassic outcrops of the Tuwaiq Mountain limestone along the Tuwaiq Mountain Escarpment near the city of Riyadh, Saudi Arabia.This study was a first step towards building a quantitative 3-D geologic model for use as an analog to the lower Arab-D reservoir.Outcrop analogs like this one are critical to understanding reservoir performance on the flow-unit scale (1 to ).