THE CADDO PINE ISLAND FIELD

The Caddo Pine Island Field is located approximately twenty (20) miles northwest of Shreveport, in Caddo Parish, Louisiana. The Caddo Pine Island Field was discovered in 1905 and since then, there have been over sixteen thousand (16,000) wells drilled by various operators. The entire Caddo Pine Island Field covers over eighty thousand (80,000) surface acres with the primary productive zone being the Annona Chalk formation encountered at approximately 1,500 feet. The initial discovery wells were completed in the Nacatoch Formation at approximately 1,100 feet.

The first wells of the Caddo Pine Island Field produced primarily gas and supplied to the towns of Shreveport, Louisiana and Texarkana, Texas. This production came from the Nacatoch Formation. By 1908, the annual oil production in the Caddo Pine Island Field had increased to 500,000 barrels. By 1910, the Caddo Pine Island Field was established as a major oil field producing in excess of 30,000 BOPD. Some completions in the Annona Chalk formation produced greater than 5,000 BOPD initially. The Caddo Pine Island Field has proven to be northern Louisiana’s greatest oil field, producing in excess of 400,000,000 barrels of oil.

Geology

The Caddo Pine Island Field is located on a graben-faulted dome on the north flank of the Sabine Uplift in north-west Louisiana. Primary uplift of the dome occurred at the end of the Lower Cretaceous Period and was followed by erosion. Numerous episodes of uplift and erosion resulted in several thousand feet of sediment being eroded off the crest of the structure. The crest of the Lower Cretaceous structure is located in Sections 14 and 22, of Township 21 North, Range 15 West. The major accumulation of the oil in the Annona Chalk formation is found on the southern, up thrown side of the garben system. Oil and gas accumulations have also been identified in the Nacatoch Formation, which can be found in most positive structural closures in the Caddo Pine Island Field area.

At the end of the Lower Cretaceous Period, a general emergence of an area embracing northern Louisiana, southern Arkansas and adjacent portions of northeast Texas, took place. This entire area was subjected to long, cultural, continued periods of erosion. During the period following the Lower Cretaceous Period several sharp, localised domal uplifts, arising from the deep-seated salt movements, took place in northwest Louisiana. Caddo Pine Island Field is one of the areas in which these uplifts occurred and erosional truncation over the uplift was significantly more complete in the surrounding area. Due to these geological features, the structural and stratigraphic traps were created and the formations previously mentioned became reservoirs for millions of barrels of oil.