The geological conditions of the complex fault block reservoir in the Paleogene of Jidong Oilfield

Nanpu Sag

northern Huanghua Depression

Bohai Bay Basin are complex. There are many faults

small fault blocks

the main reservoir is deeply buried

and it is shielded by the widely developed volcanic rocks. Therefore

the quality of seismic data is poor

the stratigraphic correlation and fine structural interpretation are difficult

the basin area is small

the source is close

the deposition rate is fast

and the sand body superposition relationship is complex. In order to effectively identify the distribution and connectivity of inter-well sand bodies and finely characterize the structural morphology

fine description and research on the complexity geological conditions in Jidong Oilfield have continuously carried out in recent years. Six key technologies have been gradually formed

including small layer division and fine correlation of complex fault block reservoirs

low-order fault identification

comprehensive characterization of delta reservoirs

formation and main controlling factors of dominant permeability channels in the process of water injection development

three-dimensional geological modeling of complex fault block reservoirs

and quantitative characterization and distribution of remaining oil

which are applied to five typical blocks

including two types of reservoir genesis of fan delta and braided river delta

and two types of physical properties of medium permeability and low permeability. In the development stages of medium water cut and high water cut

normal water injection development and overall fracturing water injection development are the theoretical basis for the rational development of complex fault block reservoirs in Jidong Oilfield.