沃尔什函数薄层评价技术在乌南油田中的应用

青海乌南油田普遍发育厚度仅为几十cm的薄储层，这些薄储层和泥岩夹层形成了砂泥岩互层。乌南油田老测井资料多为分辨率较低的常规测井资料，评价薄层困难，为此，提出了沃尔什函数薄层评价技术。介绍了沃尔什函数在测井曲线薄层分析中应用的理论依据，并利用沃尔什函数薄层评价技术对乌南油田7口井的测井资料进行了处理，处理后的测井曲线与高分辨率测井中的微电位曲线有较好的匹配关系，分辨率得到了提高。最终结果与实际地质情况较吻合。

The application of thin bed evaluation by walsh function in Wunan oilfield

Many thin reservoirs are only several centimeters in Wunan oil field at Qinghai, these thin reservoirs and thin shale is alternative. Because there is only conventional logging data, which has a low resolution, it is difficult to evaluate thin bed in old wells of Wunan oilfield. Since interbed can be supposed laminated uniformity and formation parameters are often expressed by step function. The result to solve FredHolm first type integral equation is preponderant with Walsh function, which has a simple arithmetics highspeed calculation and a high accuracy. Thin bed evaluation by Walsh function is applied to evaluate seven wells in Wunan oil field. The result of evaluation shows the feasibility.