The Delta Field produces from the only identified petroleum system in the Niger Delta region, the Agbada Formation where it is targeted from structural traps.
12.
The Niger Delta Nembe Creek Oil field was discovered in 1973 and produces from middle Miocene deltaic sandstone-shale in an anticline structural trap at a depth of.
13.
Oil and gas exploration is usually concentrated very close to these faults in the downthrown block because these are considered as structural traps preventing oil and gas from escaping.
14.
Petroleum geologists broadly classify traps into three categories that are based on their geological characteristics : the structural trap, the stratigraphic trap and the far less common hydrodynamic trap.
15.
The Grondin Oil Field was discovered in water depths offshore, in 1971 and produces from the Batanga sandstones of Maastrichtian age forming an anticline salt structural trap which is about deep.
16.
Both of these porous units are richly oil-bearing elsewhere in the Los Angeles Basin as well, anywhere that oil can collect due to a combination of stratigraphic and structural traps.
17.
Consequently, precipitation of salt during the first Mesozoic rift episode resulted in partial isolation of crustal extension from extension and creation of structural traps of the overlying sedimentary column during subsequent rift episodes recognized in the Jeanne d'Arc Basin.
18.
Oil in the field is found in both structural traps such as anticlinal folds, in which oil migrates upwards and is trapped beneath an impermeable layer, and stratigraphic traps, where oil is trapped within a rock unit due to changes within the rock itself.
19.
Even with the impermeable caps and structural traps, there are enough breaks in the structure for significant natural tar seeps to occur; indeed the entire region is riddled with natural seeps, and tar was used by the native Chumash peoples as a sealant for their watercraft.
