基于四分量偶极横波远探测的井周构造走向快速反演方法研究  

Research on a fast inversion method for structural strike around a borehole based on four-component dipole shear wave reflection imaging

作　　者：李盛清 苏远大[1,2,3] 唐晓明[1,2,3] LI ShengQing;SU YuanDa;TANG XiaoMing(School of Geosciences,China University of petroleum,Qingdao 266580,China;Key Laboratory of Deep Oil and Gas,China University of petroleum,Qingdao 266580,China;China Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,青岛266580 [2]中国石油大学(华东)深层油气重点实验室,青岛266580 [3]青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室,青岛266071

出　　处：《地球物理学报》2020年第6期2478-2487,共10页Chinese Journal of Geophysics

基　　金：国家自然科学基金(41804124,41821002);国家重点研发计划(2019YFC0605504);山东省自然基金(ZR2019BD039);山东省博士后创新项目(201901011);中国博士后科学基金(2019T120615,2018M632745);中石油重大科技项目(ZD2019-183-004);中国科学院战略性先导科技专项(XDA14020304,XDA14020302)联合资助.

摘　　要：偶极声源的辐射特性及仪器的四分量正交采集系统使得偶极横波远探测可在一维井筒中对井外构造进行方位探测.基于反射横波幅度随声源偏振方向呈余弦平方变化这一特征,本文提出一种利用函数拟合快速反演井周构造走向的方法.根据这一规律,该方法仅用4个方位剖面数据即可准确反演井周构造走向,同时得到井周构造的离井距离和倾角.数值模拟和物理实验模拟均验证了幅度随方位的变化以及反演方法的可行性.根据这一方法做的现场实例也进一步证明了该方法的适用性.本文工作为利用四分量偶极数据进行井周构造的反射横波成像提供了实用而有效的处理方法.The directional radiation characteristics of the dipole source and four component acquisition of the tool allow dipole shear wave reflection imaging to determine the orientation of geological structures from the 1 D borehole.Based on the amplitude variation of the reflected shear waves with the source,we propose an efficient method for determining the strike of geological structures around the borehole.This method uses the reflection images of only four azimuths to determine the strike of structure,the distance from the borehole and dip of structure can be obtained by this method with only four azimuth profile data,The azimuthal variation characteristics of the reflection waves and the validity of the processing method are verified by both the theoretical modeling and laboratory experiment results.Examples of field data processing further confirm the application validity of the method.This paper provides a practical and effective processing method for determining the geological structures around the borehole using four-component dipole shear wave reflection imaging.

关 键 词：正交偶极四分量 横波远探测 方位探测 反射体走向 

分 类 号：P631[天文地球—地质矿产勘探]