泥浆滤液侵入带的感应测井响应及环境影响  

Induction Log Response and Environment Impact of Filtrate-Invaded Zone

作　　者：陈启艳[1] 范晓敏[1] 王斌[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《新疆石油地质》2008年第1期61-64,共4页Xinjiang Petroleum Geology

摘　　要：由于地层非均质性和泥浆性能等综合影响,同一地层的侵入带半径常常是随深度变化的。通过建立二维轴对称非均匀介质中感应测井的分析模型,基于趋肤效应几何因子理论及电磁感应原理测量地层电阻率的测井方法,论述了侵入带前缘倾斜地层的正演计算理论和方法。并在侵入带前缘剖面不同倾角情况下,计算了环境因素(井眼、侵入带、层厚)对感应测井响应曲线的影响。结果表明,在相同地层条件下,深、中感应测井形状相似,幅度不同,中感应测井受侵入带影响更大。只改变井径、泥浆电阻率、侵入带电阻率、侵入带深度以及层厚,对测井响应影响不大,但改变侵入带形状却对测井响应影响非常大。这些认识为解释复杂侵入带环境对测井结果的一般影响和一些测井异常提供了理论依据,在测井解释工作中应合理考虑该影响。Because of the co-effect of formation heterogeneity and mud invasion, there exits varied radius of filtrate-invaded zone with depth. In this paper, the analytical model of mid-induction log in 2D axis symmetrical heterogeneous media is developed. Based on the skin effect geometrical factor theory and formation resistivity log method, the theory of the forward modeling of gradual change of filtrateinvaded zone front are discussed. The main features of induction log response in different angles of inclination area are described and the effect of environmental factors such as well bore, filtrate-invaded zone and layer thickness on inductologs is estimated. The results show that the deep- and mid-induction logs have similar shape but different amplitudes in the same stratum condition. The mid-induction log is more influenced by the filtrate-invaded zone. Few influences on the logging response occur in only change of well bore size, mud resistivity, filtrate-invaded zone resistivity along with its invaded depth or the layer thickness, except for changing shape of the invaded zone. The results not only provide a general explanation for the invaded environment, but also make a reasonable interpretation on some anomaly in induction log. This consideration will be helpful to get proper well log interpretation.

关 键 词：侵入带 趋肤效应 几何因子理论 感应测井 正演 

分 类 号：P631.81[天文地球—地质矿产勘探]