测井曲线重构和频谱分析技术在塔里木盆地塔河油田卡拉沙依组储层预测中的应用

由于受不同地质情况的影响,常规测井曲线不能很好地解决特殊地质问题。针对塔河油田三区石炭系卡拉沙依组的储层地质特征,利用频谱分析技术对伽马、中子测井曲线进行处理。与常规测井曲线比较,地层的旋回特征在频谱分析曲线上更加明显。根据相同地层具有相似旋回性的原理,利用伽马、中子频谱分析曲线进行地层横向对比,使研究区卡拉沙依组砂泥段的砂组划分、对比达到了协调和统一;以声波曲线为本体,结合反映岩性的测井曲线(伽马、中子、自然电位等曲线),应用曲线重构技术构建储层特征曲线,为测井约束反演提供地质依据,使反演结果更接近于地质实际情况。利用反演资料进行储层预测的结果与测井解释有利储层段进行比较,吻合率和较吻合率分别为71.6%、11.3%。

Application of Spectrum Analysis and Reconstructive Logs Technique in the Reservoir Prediction in Kalashayi Formation of Tahe Oilfield, Tarim Basin

Normal logs cannot solve special geological problems for the influence of different geological factors.In view of reservoir quality in block 3 of Kalashayi Formation of Tahe oilfield, normal logs is transferred to spectrum analysis curves using spectrum analysis technique, and stratigraphic correlations are made using spectrum analysis curves to ensure the accuracy of correlations.Log constrained inversion is employed in predicting sand reservoirs in Kalashayi Formation based on the results of stratigraphic correlations and reconstructive logs,the application result shows it is of great value to reservoir prediction.