陈堡油田过套管电阻率测井分析技术

Resistivity Through Casing in Chenbao Oilfield

陈堡油田已经注水开发多年,油层水淹比较严重。从2009年起,采用俄罗斯ECOS–31–7型过套管电阻率测井技术测量了部分生产井。通过对比这两类测井曲线发现,过套管电阻率和裸眼电阻率曲线之间变化趋势基本一致,但是二者存在幅度差,并且水淹越严重,幅度差越明显。通过对陈堡油田ECOS测井资料的处理解释,提出了利用电阻率相对变化率这个参数来评价油层水淹的程度,结合各小层相应的生产数据,并根据过套管电阻率相对变化率有效地划分了油层水淹的级别。最后,分析了ECOS–31–7型过套管电阻率仪器在陈堡油田评价水淹层和剩余油的适应性。

Casing hole formation resistivity logging has been paid more and more attention to in recent years, and ECOS technology of Russia have been applied in some oilfields of China, and Chenbao Region, Jiangsu Oilfield, is one of those. Insofar at present, the critical task is to locate the residual oil zones and to evaluate the flooding grade of oil-bearing formation. Through comparison between ECOS-resistivity and conventional resistivity, we discover that the two kinds of resistivity have roughly similar trend. However, there are relatively obvious amplitude differences between them, and usually, the latter is larger than the former. The law is the more serious flooding, the larger amplitude difference. So this paper provides a novel method, which is the relative resistivity change rate （I~）, to evaluate the flooding grade. Through two cases, this method is proved available. Finally, we conclude that the ECOS technology is suitable for Chenbao Oilfield.