稠油油藏定向井双侧向测井校正方法研究

Study of Correction to Dual Laterolog of Directional Well in Heavy Oil Reservoir

定向井由于井斜角的变化,双侧向测井数据受围岩及层厚、井眼、泥浆等环境因素影响较大,直接影响测井解释结果的准确性,在进行定向井测井解释前,需对测井曲线作校正处理。根据定向井测井特点,选择其邻近直井的标准层对定向井双侧向曲线进行校正。选择多组定向井和直井,利用最小曲率法对定向井作深度校正,选取标准层(泥岩层及致密层);由选取的标准层数据,建立定向井双侧向电阻率校正图版,对定向井双侧向电阻率进行校正处理;进行定向井校正实例分析,并对校正效果进行检验。该方法在新疆FC油田某区齐古组的定向井双侧向测井校正中得到了较好的应用效果,校正后定向井的测井解释结果更符合研究区块的储层参数特征。

Due to the change of directional well^s angle, environmental factors, such as layer thickness, shoulder bed, borehole, mud and so on, have great influence on dual laterolog, and this may lead inaccurate result of well log interpretation. The dual laterolog curves must be corrected before well log interpretation. Based on the characteristics of directional well, marker beds of its adjacent vertical wells can be used to correct its dual laterolog. Firstly, choosed are multi-group directional wells whose depths are corrected by minimum curvature method and vertical wells to select marker beds which includes mudstone formation and compact layer. Then, established are the correction charts with the data of marker beds and correct dual laterolog. Finally, given is the test of the result. This paper takes Qigu formation of Fengcheng oilfield as a study example. The result of well log interpretation after correcting dual laterolog is similar to the real situation of the study area.