时间推移测井在油水识别中的应用

钻井液侵入地层会导致储层测井视电阻率的变化,从而影响油气水识别的准确性。试图通过数值模拟等方法恢复原状地层电阻率的反演技术目前还不十分成熟。时间推移测井技术作为一种油藏动态监测手段已经广泛应用于油气田的生产开发中,但其极少在勘探阶段中的应用。从钻井液侵入地层机理研究入手,在了解其侵入的影响因素基础上,总结地层电阻率侵入剖面特征;并充分考虑现场实施的可操作性。提出了一种利用不同时间段的测井视电阻率的变化规律来进行油水识别的方法,规避了电阻率反演的不可控性;并在探井的地层流体性质识别中取了良好的应用效果。

Application of Time-lapse Logging to Oil-water Recognition

Because of drilling fluid intrude into formation, apparent resistivity logging be changed, which would influence oil-water recognition. And so far, resistivity inversion is not a reliable method to get real resistivity of undisturbed formation. As a method of reservoir dynamic monitoring, time-lapse logging has been applied in the development and production process of oil and gas field. But, it rarely applied in the exploration period. The paper starting with the study on the mechanism of the mud-invading formation, and based on the understanding of the invading factors, makes a conclusion of the characteristics of the formation resistivity invasion profile; fully considering the operability at the working site, puts forward a method to discriminate oil and water according to the variation regularity of the apparent resistivity from logging in different time periods. This method avoids the uncontrollability of the resistivity conversion, and obtained good application performances in discriminating the formation fluid properties in exploratory wells.formation, and based on the understanding of the invading factors, makes a conclusion of the characteristics of the formation resistivity invasion profile; fully considering the operability at the working site, puts forward a method to discriminate oil and water according to the variation regularity of the apparent resistivity from logging in different time periods. This method avoids the uncontrollability of the resistivity conversion, and obtained good application performances in discriminating the formation fluid properties in exploratory wells.