井中方位纵波远探测: 理论、实验与现场应用  

Azimuthal reflected P-wave imaging: theory, experiment and field application

作　　者：苏远大[1,2,3] 饶博 孔令文 李盛清 谭宝海 庄春喜[1,2,3] 唐晓明[1,2,3] SU YuanDa;RAO Bo;KONG LingWen;LI ShengQing;TAN BaoHai;ZHUANG ChunXi;TANG XiaoMing(School of Geosciences,China University of Petroleum(East China),Qingdao 266580,China;National Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China;Laboratory for Marine Mineral Resources,Laoshan Laboratory,Qingdao 266071,China;Wuxi Research Institute of Petroleum Geology,Sinopec Petroleum Exploration and Production Research Institute,Wuxi 214126,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]深层油气全国重点实验室(中国石油大学(华东)),青岛266580 [3]崂山实验室海洋矿产资源评价与探测技术功能实验室,青岛266071 [4]中国石化石油勘探开发研究院无锡石油地质研究所,无锡214126

出　　处：《地球物理学报》2024年第2期630-640,共11页Chinese Journal of Geophysics

基　　金：国家自然科学基金(42074137,U21B2064,41821002,42174145);崂山国家实验室科技创新项目(LSKJ202203400);山东省自然科学基金(ZR201911120382);中国石油重大科技项目(ZD2019-183-004);中国石油大学(华东)研究生创新基金项目;中央高校基本科研业务费专项资金(23CX04016A)联合资助.

摘　　要：能够测量井外数十米地质构造距离和方位的远探测声波测井正成为一种重要的地球物理应用技术.1:1地层条件下井外含反射界面的远探测测量和分析为此技术提供了物理验证.本文首先利用虚源和柱面波展开理论推导了充液井孔中单极反射纵波方位接收声场的解析形式,通过模拟证明了单井的声波辐射和接收与双井之间的辐射和接收的等效性,在此基础上提出利用两口模型井来实现方位纵波远探测实验,即在测量井中放置多方位反射纵波接收声系,在另一口副井中放置单极子声源向测量井定向辐射纵波以等效来自井外地质体的反射波,依托实验室的模型井群进行井中方位纵波远探测实验研究.实验测量结果表明井中接收反射纵波的幅度和到时对井外反射体(定向辐射波)具有较好的方位灵敏度,可由此来实现井外地质异常体的精准定位.在理论与实验指导下自主设计研制了方位纵波远探测仪器样机并开展了现场井测试成功获得高信噪比的方位反射信号,充分验证了方位纵波远探测技术的准确性和有效性.Azimuthal acoustic reflection imaging logging,which can measure the distance and azimuth of geological bodies within a range of tens of meters beside the borehole,is becoming an important technology for geophysical applications.Measurements and analysis for single-well acoustic reflection imaging in the model with 1:1 reflection interface outside the borehole provide physical validation of this technique.In this paper,the analytical solution for the response wavefield of monopole P-wave in the fluid-filled borehole is deduced first by using the virtual source analogy combined with the cylindrical wave expansion method.The simulation proves that the radiation wave from the nearby borehole is equivalent to the reflected wave from the reflector outside the borehole.On this basis,the experimental idea of using two model wells to achieve the verification experiment of single-well azimuthal reflected P-wave imaging is proposed.That is,a multi-directional receiving acoustic system is placed in the measurement hole,and a monopole source is placed in the other nearby borehole to radiate P-waves to the measurement hole in order to equate the reflected P-waves from the interface outside the borehole.And the experiment about azimuthal reflected P-wave imaging logging was carried out relying on the laboratory model well group.The experimental measurement results show that the amplitude and arrival time of the azimuthal reflected P-wave are sensitive to the azimuth of the reflector outside the borehole(directional radiation wave),based on which the precise positioning of geological anomalies outside the borehole can be realized.Under the guidance of theoretical simulation and experiment,the prototype of azimuthal acoustic reflection imaging logging tool was designed and developed independently and field tests were conducted to successfully obtain azimuthal reflected P-wave with high signal-to-noise ratio,which fully verified the reliability and effectiveness of the azimuthal acoustic reflection imaging logging technology in me

关 键 词：单极纵波远探测 平行双井模型 实验测量 测井仪器 方位接收响应 

分 类 号：P631[天文地球—地质矿产勘探]