测井地层自动划分的边缘检测最优分割方法

Edge Detection Optimum Partitioning Method for Automatic Division of Log Strata

目前常用的测井地层自动划分方法是最优分割法。该方法对测井曲线形态及突变点信息利用不充分,影响了分层的地质可靠性,而且计算量大、效率低。为了克服这些问题,提出一种将边缘检测与最优分割相结合的测井地层自动划分方法。该方法先通过边缘检测发现和筛选曲线突变点,而后在突变点集合中进行最优分割,大大提高了计算速度;同时,灵活设计边缘检测指标,优化准则不仅使层间离差平方和最大,也使各分界点两侧曲线形态差异尽量大,提高了分层可靠性。通过济阳坳陷1口井中生界地层划分的实例,说明该方法具有良好的应用效果。

Log strata automatic division method as an optimum partitioning one available now is still insufficient to utilize well log patterns and distinguished point information, along with big amount of calculated data and low efficiency, affecting its own reliability. This paper presents a new method for log strata automatic division of optimum partitioning integrated with edge detection. Using this method to find and select log distinguished point and then make an optimum partitioning at the aggregate points could greatly improve the velocity of calculation; meanwhile, the flexibly designing edge detection index means not only to get the maximum interlayer deviation quadratic sum, but also to differentiate the logs style at both sides of dividing point, thus improving the reliability of log strata division, The case of Mesozoic strata division in Jiyang depression shows that this method has a good applied effectiveness.