利用测压数据确定油水界面的影响因素分析

Influencing factors of using pressure data to determine oil-water interface

为了利用测压数据准确计算渤海油田新近系明化镇组复杂油水系统下河流相储集层的油水界面,给出合理的油水界面确定方法,从测压数据选取、水线确定、油层测压点位置、原油密度4个方面开展影响因素定量分析,结果表明:数据点数及间隔对数据回归准确性存在影响;水线选取原则对油水界面影响较大,应予以重视;通过油层测压点位置及原油密度可以判断油水界面误差范围。综上所述,给出合理的油水界面确定方法及其应用的局限性提示,为提高油水界面的计算精度提供了可靠的评估依据。

To make use of pressure data to accurately calculate the oil-water interface of low fluvial facies reservoirs in the complex oil-water system of Minghuazhen formation,Neogene,Bohai Oilfield,and give a reasonable method to determine oil-water interface,the authors carried out the quantitative analysis of influencing factors from four aspects of pressure data selection,water line determination,reservoir pressure point position and crude oil density.The results showed that data points and intervals can affect the data regression accuracy.The selection principle of water line has a greater influence on the oil-water interface,which should pay attention to.The error range of the oil-water interface can be judged by the reservoir pressure measuring point position and crude oil density.To sum up,the authers gave the reasonable method of determining oil-water interface and the limitation of its application,it provides a reliable assessment basis for improving the calculation precision of oil-water interface.