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大斜度井/水平井中,随钻电磁波电阻率测井与双侧向测井由于测量原理不同,引起的测井响应特征有着较大差别。首先依据积分方程法模拟了随钻电磁波电阻率测井在大斜度井/水平井中的测井响应特征,采用三维有限元素法模拟了双侧向测井在大斜度井/水平井中的测井响应特征,然后对比分析了二者在水平地层中的测井响应差异和产生的原因。结果表明,水平井中随钻电磁波电阻率测井和双侧向测井响应差异的主要影响因素有:不同井斜角、地层各向异性、地层界面以及泥浆侵入等。随着相对井斜角的增大,随钻电磁波电阻率测井在地层界面处的测井响应异常大,而双侧向测井在地层界面附近受围岩影响逐渐变得平滑;随着相对井斜角的增加,各向异性的影响逐渐增大,但各向异性对双侧向测井的影响程度要小于对随钻电磁波电阻率的影响。这些差异如不能正确认识将导致水平井解释过程中出现偏差。最后根据实际资料,分析如何这些差异进行水平井测井解释。
In high deviatoric well / horizontal well, the electromagnetic response of logging while drilling and the double lateral logging have different logging response characteristics due to different measurement principles. Firstly, according to the integral equation method, the logging response characteristics of electromagnetic wave resistivity logging while drilling in high deviated well / horizontal well are simulated. The three-dimensional finite element method is used to simulate the measurement of double lateral well in high deviated well / horizontal well Well response characteristics, and then comparative analysis of the logging response in the horizontal formation differences and causes. The results show that the main influencing factors of the difference between the electromagnetic wave resistivity logging while drilling and the response of the double lateral logging in horizontal well are: different well inclination, formation anisotropy, formation interface and mud invasion. With the increase of relative well inclination angle, the logging response of the electromagnetic wave resistivity logging while drilling is abnormally large at the interface of the formation, while the bilateral lateral logging is gradually affected by the surrounding rock in the vicinity of the formation interface. As the relative The effect of anisotropy on the increase of well inclination angle and anisotropy gradually increases, but the influence of anisotropy on the double lateral logging is less than that on the resistivity of the electromagnetic wave while drilling. These differences, if not correctly understood, will lead to deviations in the interpretation of horizontal wells. Finally, according to the actual data, analyze how these differences are interpreted by horizontal well logging.