摘要
大斜度井和水平井的测井解释和地层评价的方法和模型主要是针对直井,与实际情况有很大的偏差。在随钻电磁波测井中,层厚和井斜的影响从来都是联系在一起的。通过傅里叶-汉克尔变换法得到斜井中的电磁波电阻率测井响应,模拟分析了不同井斜条件下层厚对电磁波测井响应的影响结果表明,随钻电磁波电阻率受围岩影响:曲线探测深度越大,围岩影响越严重。深相位电阻率在大斜度井低阻围岩情况下,层厚校正模板中校正电阻率值不再随层厚增加单调递减;当层厚较小时,视电阻率在大斜度井中的校正值小于直井中的校正值;随着层厚的增大,大斜度井中的校正值大于直井中的校正值。这些结论可以有效指导大斜度井环境下随钻电磁波电阻率测井资料的解释。
The method and model used in the logging interpretation and formation evaluation of highly-deviated and horizontal wells are mainly based on vertical wells, which is not applicable to the actual conditions. The effect of bed thickness and well deviation is always connected with electromagnetic wave while drilling resistivity logging. The instrument response was obtained through fast Fourier-Hankel transform （FFHT） algorithm, and the influence of bed thickness was also analyzed with different borehole angles. The results show that the shoulder effect on electromagnetic wave while-drilling logging curves is different： the deeper the investigation goes, the more serious the shoulder effect is. The corrected deep phase resistivity does not monotonously decrease with the increase of bed thickness in highly deviated wells with low resistivity shoulder. The corrected resistivity is less in highly-deviated wells than in vertical wells when the bed thickness is small, and with the increase of bed thickness, the corrected resistivity will be larger in highly-deviated wells than in vertical wells. These conclusions can be used to guide the interpretation of electromagnetic wave while-drilling resistivity logging in highly-deviated wells.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第4期75-80,共6页
Journal of Southwest Petroleum University(Science & Technology Edition)
关键词
大斜度井
随钻电磁波电阻率
层厚校正
仪器响应
极化角
highly-deviated well
electromagnetic wave logging resistivity while drilling
correction of bed thickness
in-strument response
polarization horn
