单井水淹层测井解释系统厚度划分方法研究

Research on thickness classification of log interpretation system of water flooded zone in individual well

由于厚度划分工作逻辑繁琐、复杂,测井曲线识别难度大,国内大部分油田的厚度划分工作仍然以人工为主,人工划分厚度速度慢、工作量大、效率低。为了提高解释效率,在研究小波分析理论的基础上,探索出了一套利用一维小波连续变换的方法实现计算机自动划分厚度。利用该方法可以对大庆长垣喇萨杏油田表外厚度、砂岩厚度、有效厚度进行计算机自动划分。通过对3口取心井和30多口调整井的厚度划分对比表明,该方法一次划分厚度层数划准率超过了80%,具有良好的应用前景。

Because of the complex of thickness classification and the difficulty in identifying logging curve, present domestic oilfields mostly adopt manual operation. However, manual classification has many disadvantages, such as slow speed, heavy workload and low efficiency. In order to enhance the efficiency of interpretation based on the wavelet analysis method, this paper has presented a series of methods using one dimensional wavelet continuous transformation to realize the thickness classification automatically by computer, with which the useless reservoir thickness, sandstone thickness and effective thickness of Lasaxing oilfield in Daqing placanticline can be classified automatically by computer. Through the comparison of thickness classification for three coring wells and over thirty adjustment wells, the classification accuracy of thickness zones exceeds 80% with favorable application future.