Oil-gas generating-reserving models for sandy gravel bodies in the north zone of the dongying depression

摘要

There are several types of sandy gravel bodies in the Sha-III and the Upper Sha-IV Member of the north zone of the Dongying depression and they formed widely distributed lithologic oil-gas pools. In this paper five pool-forming models are put forward through analyzing of sandy gravel bodies: up-dip thinning out- type pool-forming, sandy gravel dome-type pool-forming, fault cutting-barrier-type pool forming, thin- bedded mudstone closed cover-type pool forming, and sandstone lens-type pool forming.