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在水平井中,井眼轨迹与顶界面地层之间的距离将直接影响测井响应、测井资料解释结果以及油藏开发效果。在碎屑岩水平井中,常规资料由于受到来自井筒环境和仪器偏心的影响,很难对油层进行有效评价。在储层较薄的碎屑岩水平井解释中引入避水高度的计算,一定程度上排除了测井曲线受井眼环境影响对测井解释的干扰;在储层较薄的碎屑岩储层,水平井资料受地层界面影响较大,在没有合适校正方法时,应尽量选用能反映储层自身信息的测井资料。根据各种资料受地层界面的影响情况,建议选择探测深度较浅的测井资料进行评价,如:自然伽马(自然电位)、井径、中感应及八侧向、补偿中子。以塔河油田S1H井为例,利用测井资料对水平井井眼轨迹进行分析,并对其在水平井测井资料认识和避水高度计算等应用上进行探讨。
In horizontal wells, the distance between wellbore trajectories and the top interface formation will have a direct impact on well logging response, log interpretation and reservoir development. In clastic horizontal wells, conventional data are difficult to evaluate effectively due to the influence of wellbore environment and instrument eccentricity. The introduction of the calculation of water-avoidance height into the interpretation of horizontal well of clastic rocks with relatively thin reservoirs excludes the interference of well logging curves to log interpretation to a certain extent. In the case of thin clastic reservoir The horizontal well data is greatly influenced by the formation interface. When there is no suitable method for correction, the logging data that can reflect the reservoir’s own information should be used as far as possible. According to the influence of various data affected by the formation interface, it is suggested to select logging data with shallow depth of investigation for evaluation, such as natural gamma ray (GEP), well diameter, middle induction and eight lateral compensation neutrons. Taking the S1H well in Tahe Oilfield as an example, this paper analyzes wellbore trajectories of horizontal wells by using well logging data, and discusses its application in horizontal well logging data understanding and calculation of water avoidance altitude.