Ruston
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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.
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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.
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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.
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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.
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