Continental shelf offshore San Pedro/Long Beach showing general location of the Wilmington Graben in red Small circles are earthquake epicenters Line of cross section for seismic Line 84 across Beta oil field southern portion of Wilmington Graben

Seismic cross section for Line 84 showing sedimentation southwest and northeast of the Palos Verdes fault through Beta oil field.

Typical log for the Beta oil field Depth (ft) 2000 4000 Typical log for the Beta oil field Production from zones A through F in the upper Miocene Delmontian 6000

Location of Beta 3D seismic survey data used by geophysical consultant Mark Legg of Legg Geophysical to evaluate the structure of Wilmington Graben

Stratigraphy of the San Pedro shelf Beta field production from Delmontian (Monterey Formation) Black areas represent missing section at unconformities

Time-slice from 3-D seismic volume at 1688 ms two-way-travel-time, at about the Mohnian/Delmontian boundary. Major structural features are identified including small domes that may form closures for structural traps. Fault picks are shown by X’s; stratigraphic horizon picks by small colored dots. Grid shows California State Plane Coordinate System, Zone VI, NAD27 with labels in feet.

Structure contour map of basement in the Wilmington Graben based on Beta 3D seismic survey Areas uplifted by two large basement blocks (light blues to oranges) in the northwest and southeast of the studied area Average depth to basement 10,000 ft Lines of seismic cross sections for lines 41, 181 and 556 shown

Structure contour map of the top Mohnian based on Beta 3D seismic survey Miocene and Pliocene sediments are folded into anticlines above basement peaks\ Average depth to Mohnian approximately 5600 ft Lines of seismic cross sections for lines 41, 181 and 556 shown

Seismic cross section for Line 556, northwest to southeast along the Wilmington Graben Basement in purple Mohnian –Delmontian boundary in blue

Seismic cross section for Line 181, southwest to northeast across southern end of Wilmington Graben

Seismic cross section for Line 41, southwest to northeast across northern end of Wilmington Graben Uplifted basement block to NE end of line

Potential CO2 Sequestration Targets for the Wilmington Graben Based on Legg, 2007