An offshore seismic survey in 1954 showed a continuous anticlinal structure extending from the presently developed area of the Wilmington oil field in Long Beach Harbor to an undetermined distance toward the southeast. Seventy miles of line were shot with "L" spreads during 9 operating days.

A number of normal faults transverse to the axis of the anticline were found in a pattern similar to that in the developed portion of the field. Information from 8 core holes drilled in 1962 verified the structural interpretation of the 1954 seismic survey. Only minor modifications of structural trend, depths and extent of productive zones, and location of major faults were required to make the seismic map conform with the core hole information. All stratigraphic units in the developed portion of the field are present in the undeveloped area under Long Beach Harbor. At least 5 zones (Ranger, Upper Terminal, Lower Terminal, Union Pacific, and Ford) are expected to yield commercial production. Based on current information, it is estimated that the undeveloped, easterly extensive of the ilmington field will produce 1.1 to 1.5 billion barrels of oil during the next 40 years under a pressure maintenance operation.

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