渤海古近系东营组三角洲相油田地质特征研究

Study on the Geological Characteristics of Delta Facies Oilfields in Paleogene Dongying Formation of Bohai Bay

施亚洲

SHI Yazhou

中海石油(中国)有限公司天津分公司, 天津塘沽 300452

Tianjin Branch of CNOOC Ltd., Tanggu Tianjin 300452, China

渤海古近系东营组三角洲相油田是渤海油田的主力含油层系。从构造、储层与沉积、流体和油藏等方面对渤海海域东营组三角洲相油田地质特征进行了研究, 按河流三角洲和辫状河三角洲相砂岩油藏两种沉积相类型分别对储层分布特征进行了描述。在此基础上探讨了此类油田的流体分布特点和油藏模式, 并认为渤海东营组三角洲相油田以中到大型为主, 储层岩性大都属于高孔高渗的疏松砂岩, 储层具有分布较稳定、油层厚和物性好等特点, 原油以普通稠油为主, 其次是中、低黏油。

Delta facies oilfields in Paleogene Dongying Formation of Bohai Bay are the main oil-bearing series. In this paper, the geological characteristics of delta facies oilfields of main Dongying Formation in Bohai Bay have been studied, focus mainly on structure, stratigraphy, sedimentation, fluid and reservoir characteristics. The reservoir description on the distribution characteristics of fluvial delta facies and braided river delta sandstone facies reservoirs have been conducted. Based on the study results, the fluid distribution characteristics and reservoir modes of such oilfields have been discussed. It is believed through study that most of the delta facies oilfields are large scale reservoirs, and the reservoir lithology is mainly unconsolidated sandstone, with high porosity and high permeability. The reservoirs are characterized by steady distribution, relative large thickness and good physical properties. The oils are mainly heavy oil, and secondly medium and low viscosity oils.

https://doi.org/10.3969/j.issn.1008-2336.2013.04.006