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水平井技术在给油气田开发带来巨大效益的同时,也给测井等工程技术带来了新的难题。水平井随钻测井和直井电缆测井具有较大差别,不同的测井响应特征对已比较成熟的电缆测井解释方法提出了挑战。在比较了水平井中随钻测井和电缆测井感应电阻率曲线之间的区别后,得出以下结论:两者在储层内部相差较小;在界面处及其附近的响应特征受地层界面表面电荷、钻井液侵入深度大小及井眼与地层夹角大小的影响较大。在测井解释中以电阻率资料为主时,应结合其他测井资料综合分析井眼轨迹与地层界面之间的关系和夹角大小,从而正确地划分储层界面。
Horizontal well technology brings enormous benefits to the development of oil and gas fields, but also brings new challenges to engineering technologies such as logging. Horizontal well logging while drilling and vertical well logging have great differences. Different logging response characteristics have challenged the mature methods of cable logging interpretation. After comparing the difference between the logging resistivity curves of logging-while-drilling and cable logging in horizontal wells, the following conclusions are drawn: the difference between the two is small within the reservoir; the response characteristics at and near the interface are affected by the formation interface Surface charge, depth of invasion of drilling fluid and the influence of the angle between borehole and formation are significant. When resistivity data is the main component of well logging interpretation, the relationship between wellbore trajectory and formation interface and the included angle should be analyzed in combination with other well logging data to correctly classify the reservoir interface.