The Sabine Arch is a large (1 2,000 mi2 [31,000 km2]), low-amplitude anticline centered on the Texas-Louisiana border. A basement-cored feature that formed in the Jurassic, the arch has been interpreted as (1) a Jurassic horst that persisted throughout the Cretaceous as a topographic relict of rifting, (2) a dome caused by deep-seated Cretaceous plutonism, and (3) a fold caused by regional tectonism. Using regional maps and cross sections derived from approximately 800 well logs, we outlined the depositional history of the arch region, thus documenting arch movement history.

Unrecovered mobile oil is oil that is movable at reservoir conditions but is prevented from migrating to existing we1 l bores because of geologic complexities or heterogeneities. To assess the potential for incremental recovery of unrecovered mobile oil from reservoirs owned by The University of Texas System, the volumes of unrecovered mobile oil remaining in reservoirs on University Lands were quantified through integrated characterization of individual reservoirs.