The oil and gas Po have different origins

The oil and gas Po have different origins, in fact most of the deposits in the Plio-Pleistocene reservoirs, consisting of methane gas, like that of Ravenna (discovered in 1952 with 30 producing wells that extract natural gas with 99.5% traces of nitrogen and higher hydrocarbons, the depth of extraction is between 1250 and 1960 meters and the trap is a structural joint, particularly a synsedimentary anticline with a covering of clay of the same age) or to Serigne (discovered in 1954 11 wells that extract natural gas 99.2% pure with traces of higher hydrocarbons and nitrogen and the depth of extraction is of 1305 meters, the type of stratigraphic trap is the erosion of the cover of the Messinian) is deemed to have an origin biogenetic .  
The clay of these sequences are in fact formed by alternating layers of clay and sandy soils that contain organic matter with a predominantly terrestrial plant and then, under conditions of rapid accumulation occurs resulting in the formation of gas levels

in the drainage of clay and gas levels sandy. So biogenic gas could be formed in large quantities and form a reservoir space.
Another source is the gas with a higher oil content of the order of 3-10%, the latter fact comes from the kerogen of great depth (see petroleum), and in many cases the oil is able to migrate through the fracture zones Pliocene and Quaternary reaching the reservoir, then mixed with the gas diagenetic of recent origin.  
This type of situation is found in Cavone deposit (discovered in 1973 near Modena, produces oil at 24.3 API, the depth of extraction is about 3000 meters, the trap is made of a structural anticline) or in Malossa (discovered in 1973 always produces 79.08% pure methane with higher hydrocarbons, and condensed to 53 API, and due to the fracturing of the cover gas is also filtered in the above sequences. 
The depth of extraction is 5830 meters, and the trap is structural, in particular a faulted anticline that has been tettonizzata at the end of the Miocene). Alongside a section of the field of Gela, from Pieri 1969. Under the oil platform in the Perla field, off the coast of Gela, the old photographic documentation, ENI.



Great importance of Villafortuna

Of great importance is the giant Villafortuna, (near Novara, discovered in 1984 and produces oil at 34 API, from a depth between 4600 and 6200 meters), which happens to be the largest oilfield in continental Europe and produces 61,000 barrels per day (1 barrel is 158.76 liters).Even in the Northern Apennines was resumed exploration with the identification of some deposits, small, but interesting in structural traps located in the outer elements of the chain, which are located in the Marche and in the eastern Adriatic Sea. Even in this case the oil has different origins: a first group of gas fields has fields with reservoir lithology sandy Pliocene, while a second group, containing oil and gas, but has sandy Miocene reservoir lithology with sup. and Lower Pliocene. (Deposits and Busseto Cortemaggiore). A third group of deposits, containing oil and gas, Jurassic carbonate reservoir has cretaceci Cretaceous or Eocene (Marche fields of Santa Maria beach, St. George's sea bream, Dora