Abstract:

Dongying Depression is a dustpan-shape fault basin with 1200 well developed normal faults in it. The tension fractures of the baserock resulted from tensile and shear movements usually form hydrocarbon enriched zones of buried-hills and stratigraphic overlap traps on steep slopes of the depression, but form large hydrocarbon-bearing drape fault-noze structures inside the depression. Gravity slump faults formed in the Tertiary usually reach the source rocks. The associated rollover anticlines and fault terrances are easy to form oil and gas enriched zones. faults resulted from diapirs are mainly situated in the depression, cut the structures into pieces and make hydrocarbon pools more complicated. The distribuion of 3 kinds of different genetic fault systems have controlled the distribution of oil and gas pools, and resulted in 3 different hydrocarbon-bearing sequences.Different fault systems within the sequences have determined hydrocarbon types, the number of the sequences and the quality of crude oil.