东营凹陷断裂系统对油气藏分布的控制

CONTROL OF FAULT SYSTEMS ON OIL AND GAS DISTRIBUTION IN DONGPU DEPRESSION

李春光

Li Chunguang

东营凹陷的断裂十分发育.其中,基岩张性断裂控制凹陷边缘地层油气藏分布;盖层重力滑塌断裂控制凹陷陡坡滚动背斜油气藏分布;底辟拱张断裂控制凹陷内部和缓坡复杂断块油气藏分布.这些断裂控制了一系列伴生圈闭的大规模油气聚集,并在凹陷不同部位具有不同的含油气特点.

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.

10.11743/ogg19940109