CAJ | 학술논문

针对偶极横波远探测测量模式开展相关的实验研究，模拟研究了井中偶极声源激励下来自井旁地层界面的反射横波，分别测量了不同声源位置、不同声源振动方向和不同地层界面特性下的地层和井孔全波。实验结果表明：井中偶极声源除了激发出沿井传播的直达弯曲波之外，还会向地层中辐射SH和SV两种类型的横波。随着偶极声源振动方向与地层界面走向的夹角从0°增至90°，反射横波幅度逐渐减小，验证了偶极声源对于井旁反射体具有明显的方位指向特性，可以用来反演井旁反射体的走向。在固-液或固-气地层界面特性下，SH波在界面处会发生全反射，而SV波则会在界面处发生模式转换，SH反射横波更有利于进行远探测反射波成像，尤其对于井旁裂缝研究具有独特的优势。
침대우겁횡파원탐측측량모식개전상관적실험연구，모의연구료정중우겁성원격려하래자정방지층계면적반사횡파，분별측량료불동성원위치、불동성원진동방향화불동지층계면특성하적지층화정공전파。실험결과표명：정중우겁성원제료격발출연정전파적직체만곡파지외，환회향지층중복사SH화SV량충류형적횡파。수착우겁성원진동방향여지층계면주향적협각종0°증지90°，반사횡파폭도축점감소，험증료우겁성원대우정방반사체구유명현적방위지향특성，가이용래반연정방반사체적주향。재고-액혹고-기지층계면특성하，SH파재계면처회발생전반사，이SV파칙회재계면처발생모식전환，SH반사횡파경유리우진행원탐측반사파성상，우기대우정방렬봉연구구유독특적우세。
Through related experimental studies on dipole shear wave remote detection measurement-mode,we study shear wave reflection of a borehole dipole source excitation from near-borehole formation interface,and measure full waveform in-side and outside borehole under different source positions,different polarization directions and different formation interface characteristics. The experimental results show that a dipole source in a fluid-filled borehole excites direct flexural wave prop-agating along borehole and outside borehole,but also radiates two types of shear wave,which are SH-wave and SV-wave, respectively. Along with the dipole polarization direction from 0° to 90°,reflected shear wave amplitude gradually decreases, and verified that the dipole source for near-borehole reflector has obvious azimuthal directivity characteristics,which can be used for determining near-borehole geological structure strike. Under the solid-liquid or solid-gas formation interface charac-teristic,total reflection of SH-wave at the reflector interface will happen,and mode conversion occurs to SV wave,so SH-wave reflection helps to remote detection imaging,and has unique advantages for fractures.