Figure 4. Structure map and schematic cross-section of pressure-enhanced trap, Gibson Field and Humphreys fields, Terrebonne Parish, Louisiana. Pressure parallels stratigraphy. Downthrown-block trap, with production from Sub-Hollywood sands. At Gibson, seal is overpressured shale mass in upthrown block; at Humphreys, seal is shale mass in upthrown block to Lake Hatch fault.