According to the concept of petroleum accumulation systems and the basic principles of analytical hierarchy process

the Tertiary in Huanghua depression can be divided into four petroleum accumulation systems and sixteen subsystems.Quantitative evaluation method of petroleum accumulation system has preliminarily been established.22 geological factors in respect of source rocks

carrier rocks and traps have been selected

including organic carbon content

type of organic matter

maturity

thickness of source rock

areal coefficient of hydrocarbon delivery and intensity of hydrocarbon generation

fault

reservoir

unconformity

as well as their spacial combination.Quantitative evaluations of the elements and maturity of petroleum accumulation systems and subsystems in Huanghua depression show that the three elements

i.e.source rocks

carrier rocks and traps of the 4 systems are remarkably different

of which the Qibei system in the central part of the depression has the best development conditions

followed by the Qinan system in the same area

while the system in the south is relatively poor and the system in the north is the poorest.The maturities of the Qibei and Qinan systems in the central part of the depression are high

while those in the south and in the north are low.