This study characterized and modeled outcropping strata equivalent to the upper jurassic arab-d carbonate reservoir in central saudi arabia. Carbonate reservoir. a significant proportion of the world's oil reserves are found in carbonate reservoirs. many of these are located in the middle east, libya, russia, kazakhstan, and north america. some very large oil fields have carbonate reservoirs, including the largest conventional oil field in the world, the ghawar field of saudi arabia. The re-emerging shallow-water carbonate factory: oolites and neritic lime muds most jurassic ramps were dominated by oolitic and neritic lime-mud production, with minor contribution of skeletal carbonates. ¹saudi aramco, dhahran, saudi arabia. abstract . the jurassic contains the world-class source rocks (callovian to early kimmeridgian) and exceptional high-quality carbonates reservoirs. the grainy carbonates of the arab a, b, c, and d (late kimmeridgian to early tithonian) sequences are among the best jurassic carbonates reservoirs.