• 油气开发 •

### 利用静压数据探讨渤海海域常压油藏砂体连通性

1. 中海石油(中国)有限公司 天津分公司, 天津 300450
• 收稿日期:2015-10-21 修回日期:2016-03-23 出版日期:2016-08-08 发布日期:2016-09-06
• 作者简介:钱赓(1986-),男,硕士、工程师,油气田勘探与开发地质。E-mail:qiangeng@outlook.com。
• 基金资助:
国家科技重大专项（2011ZX05023-006-002）。

### A study on sand bodies connectivity in normal pressure reservoirs of the Bohai Sea with hydrostatic pressure data

Qian Geng, Zhang Jianmin, Liu Chuanqi, Zhan Lan, Yang Haifeng, Mu Pengfei, Li Xingli

1. CNOOC Tianjin Company, Tianjin 300450, China
• Received:2015-10-21 Revised:2016-03-23 Online:2016-08-08 Published:2016-09-06

Abstract: Based on the consistency of pressure system within the same reservoir,the theoretical linear relationship between formation pressure and depth is currently used as an important criterion to determine the connectivity of sand bodies within the same sequence stratigraphic framework under normal pressure.However,the linear rule for determining sandbodies connectivity has its limitations due to the influences of high permeability and fluid heterogeneity of reservoir.A new method for connectivity analysis of sand bodies is proposed based on mathematical induction,established the inverse proportional function between pressure coefficient and depth of reservoir.The properties of inverse proportional function such as intersection,monotonicity,boundedness and symmetries provide us a way to explore the relationship between inverse proportional function and reservoir pressure system,and to further determine the connectivity of two or more sand bodies.With hydrostatic pressure data from more than 50 normal pressure reservoirs out of 7 oilfields in Bohai Sea whose connectivity have been confirmed by wells,we verified the relationship between the connectivity of sand bodies and the properties of inverse proportional function of pressure coefficient and depth.The following conclusions were made.① The function image being continuous and overlapping,monotonicity and asymptote being consistent,and symmetry axis being unique are the critical criteria for determining the connectivity of sand bodies within the same sequence stratigraphic framework;② The pressure coefficient is more sensitive and reliable than the linear function;③ The curvature of inverse proportional function is affected by reservoir permeability and fluid properties,thus overcomes the limitations of linear rule.