测井技术2013，Vol.37Issue(2)：137-142,6.
倾斜各向异性地层随钻电磁波测井响应模拟
Numerical Simulation of Electromagnetic Logging Response While Drilling in Anisotropic Dipping Formation
摘要
Abstract
In order to realize real-time geosteering and accurate formation evaluation while drilling and to deeply research the characteristics of electromagnetic logging response while drilling in anisotropic dipping formation,a free oriented magnetic dipole is divided into horizontal and vertical sub-sources which are solved respectively on the basis of Hertz potential function.Gauss integral and Hankel transform integral are adopted in low angle and high angle respectively to compute the generalized integral with Bessel function,thereby realizing simulation of electromagnetic logging response while drilling in anisotropic dipping formation.Compared with the simulation results of EM1D,the algorithm is reliable.The effects of anisotropy ratio,frequency and deviation angle on electromagnetic logging response while drilling are then studied through simulation of the responses under different formation models.The results show that when the deviation angle is low,the apparent resistivity is nearly at the horizontal resistivity,as the deviation angle becomes larger,the apparent resistivity increases from the horizontal resistivity to the vertical resistivity,when both anisotropy ratio and deviation angle are relatively large,the apparent resistivity is far greater than the horizontal resistivity and even greater than the vertical resistivity.With higher deviation angle and frequency,the electromagnetic response is more affected by formation anisotropy and the phase difference resistivity is more sensitive than the attenuation resistivity.关键词
随钻电磁波测井/测井响应/倾斜地层/各向异性/赫兹矢量位函数Key words
electromagnetic logging-while-drilling/log response/dipping formation/anisotropy/Hertz potential function分类
天文与地球科学引用本文复制引用
范宜仁,胡云云,李虎,孙庆涛..倾斜各向异性地层随钻电磁波测井响应模拟[J].测井技术,2013,37(2):137-142,6.基金项目
国家自然科学基金项目(41174099)、国家重大科技专项(2011ZX05020-008)、中国石油天然气集团公司科学研究与技术开发项目(2011D-4101)、中国石油大学(山东)研究生创新工程资助项目(CX-1201)联合资助 （41174099）
