泾河油田长8段垂直裂缝常规测井识别

Identification of Vertical Fracture Using Conventional Log Data in Chang8 Formation of Jinghe Oilfield

针对泾河油田长8段垂直裂缝大量发育的特点和常规测井识别垂直裂缝困难的现状,提出将传统的孔隙度和电阻率异常识别方法与小波变换相结合,以电阻率响应特征异常为主识别垂直裂缝发育段的方法。泾河油田长8段垂直裂缝主要在细砂岩中发育,具有较好的含油性特征;在岩性识别的基础上,以电阻率异常特征为主,结合泥质含量变化对孔隙度和电阻率异常的影响,可有效识别该油田的垂直裂缝发育段。

Wavelet transform can strengthen the exception features of porosity and resistivity and eliminate considerably the exceptions associated with lithology and random disturbance.Because the observed fractures of Chang8 formation in Jinghe oilfield are mainly vertical fractures,which are very difficult to be identified using conventional logging suite,a new method combined with wavelet transform and traditional logging interpretation methods is proposed in this paper.The conclusion indicates that:the vertical fractures in chang8 formation in Jinghe oilfield occur mainly in fine sandstone layers with the fine property of oiliness;Based on lithology identification,the vertical fractures in this oilfield can be identified effectively by analyzing the exception of resistivity,and combining with the effect of mud content on the exceptions of porosity and resistivity.