FIELD

TECTONICH

REGIONALS

LOCALSTRU

WELLLOCAT

TRAPTYPE

Ruston

N Louisiana Salt basin, between Monroe/Sabine uplifts, encompasses many salt supported structures generated by Louann Salt, which began moving in U. Jurassic. Ruston structure was formed by a salt swell/salt pillow. It is not a piercement structure.

Ruston field lies just south of the Unionville nose and east of the Terryville field anticline. A very slight dip reversal separates Ruston field from the Choudrant field structure to the southeast.

Salt-generated dome with approx. 200 ft (60 m) of closure at Cotton Valley (Jurassic) level and 50 ft (15 m) of closure at Hosston-James (Lower Cretaceous) level. The structure plunges to the SW, forming a significant nose.

Majority of zones are structurally trapped but several zones (Cotton Valley Davis, Cotton Valley "C," Cotton Valley "D" ss and various Hosston ss) are combination structural-stratigraphic traps.