倾斜层理地层随钻电磁波测井响应特征

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英文篇名：Logging while drilling electromagnetic wave responses in inclined bedding formation 作者：范宜仁 ; 胡旭飞 ; 邓少贵 ; 袁习勇 ; 李海涛 英文作者：FAN Yiren;HU Xufei;DENG Shaogui;YUAN Xiyong;LI Haitao;School of Geosciences, China University of Petroleum;Key Laboratory of Deep Oil & Gas Geology and Exploration, Ministry of Education, China University of Petroleum;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology;CNPC Key Laboratory for Well Logging, China University of Petroleum;China University of Petroleum-Beijing at Karamay; 关键词：随钻电磁波测井 ; VTI介质 ; TTI介质 ; 各向异性角 ; 各向异性方位 ; 并矢格林函数 英文关键词：electromagnetic wave logging while drilling;;VTI medium;;TTI medium;;anisotropic dip;;anisotropic azimuth;;Dyadic Green's function 中文刊名：SKYK 英文刊名：Petroleum Exploration and Development 机构：中国石油大学(华东)地球科学与技术学院;深层油气地质与勘探教育部重点实验室;海洋国家实验室海洋矿产资源评价与探测功能实验室;中国石油大学CNPC测井重点实验室;中国石油大学(北京)克拉玛依校区石油学院; 出版日期：2019-04-01 11:13 出版单位：石油勘探与开发 年：2019 期：v.46;No.271 基金：国家自然科学基金项目(41474100,41574118) 语种：中文; 页：SKYK201904006 页数：9 CN：04 ISSN：11-2360/TE 分类号：59-67

摘要

为实时反演、快速重构地层真电阻率,消除常规随钻电磁波测井正演基于含垂直对称轴的横向各向同性(VTI)地层模型仅考虑水平和垂直方向电阻率的局限性,基于并矢格林函数给出一套含倾斜对称轴的横向各向同性(TTI)地层的随钻电磁波测井正演计算方法。采用各向异性角和各向异性方位来表征TTI地层的各向异性特性,通过数值算例验证了算法的正确性,分析了不同介质情况下的半空间电磁波反射和透射特征,指出使用新算法的必要性。数值模拟结果还表明,TTI地层中,存在临界井斜角和临界各向异性角,在这两个临界角的两侧,随钻电磁波测井响应随井斜角与各向异性角的变化规律相反;此外,在界面处的"犄角"不仅与井斜、电阻率对比度等因素有关,还与各向异性角和各向异性方位有关。图13表3参15
        For real-time inversion and fast reconstruction of formation true resistivity, the forward modeling of electromagnetic wave logging while drilling is usually based on the transversely isotropic formation model with vertical symmetry axis(VTI medium), but it only considers the horizontal and vertical resistivity. It has certain limitation during practical application. This paper presents a forward calculation method of electromagnetic wave logging while drilling in transversely isotropic(TTI) strata with inclined symmetry axis based on the Dyadic Green's function. Anisotropic angle and azimuth are used to characterize TTI formation. The proposed algorithm is verified by numerical examples, the half-space electromagnetic wave reflection and transmission characteristics with different media are analyzed,and the necessity to use the new algorithm is pointed out. Numerical simulation also shows that there exist a critical borehole dip and critical anisotropic angle in TTI formation. Electromagnetic wave logging while drilling responses follows opposite rule before and after these two critical angles. Besides, the "horns" at the interface are not only related to well deviation, resistivity contrast, but also related to anisotropic angle and anisotropic azimuth.

引文

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