石油与天然气地质 ›› 2016, Vol. 37 ›› Issue (4): 584-590,597.doi: 10.11743/ogg20160416

• 油气开发 • 上一篇    下一篇

利用静压数据探讨渤海海域常压油藏砂体连通性

钱赓, 张建民, 刘传奇, 张岚, 杨海风, 穆鹏飞, 李兴丽   

  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

摘要: 基于同一个油藏压力系统的一致性,常压条件下地层压力与海拔理论上的线性关系是目前判断同一层序地层格架下砂体连通关系的重要依据。受储层高渗与流体非均质性的影响,判断砂体连通性的线性规律存在局限。通过数学归纳分析,发现常压油藏砂体连通关系的新方法,即建立压力系数与海拔的反比例函数关系。根据反比例函数的相交性、单调性、有界性与对称性,探讨反比例函数性质与油藏压力系统的关系,进一步判断砂体的连通性。针对渤海海域7个油田、50余个开发井已证实连通关系的常压油藏,验证压力系数-海拔反比例函数性质与砂体连通性的关系并证实:①函数图像连续且相交重合、单调性与渐近线一致且对称轴唯一是判断同一层序地层格架下砂体相连通的关键依据;②压力系数对分析砂体的连通关系比地层压力的线性关系更为敏感、可靠;③函数曲率受储层渗透性和流体性质等影响,规避了线性规律的局限。

关键词: 压力系数, 反比例函数, 流体非均质性, 渗透性, 常压油藏, 渤海海域

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.

Key words: pressure coefficient, inverse proportional function, fluid heterogeneity, permeability, normal pressure reservoir, Bohai Sea

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