CAJ | 학술논문

针对不整合界面下的逆冲断层进行反射地震勘探的可行性问题，进行了一项波动方程正演模拟数值试验。勘探的地质目标包括断层的断面形态，以及附近几个厚度仅仅为几米的地质透镜体。根据掌握的地质资料建立地震参数模型，用波动方程正演模拟技术模仿地震勘探观测系统的施工方式，滚动放炮合成了38炮地震数据，然后按照生产资料处理流程对这些数据进行处理，最后得到地震波速度模型剖面、地震数据叠加剖面以及偏移剖面等图像成果。试验结果表明，如果采用较高频率的震源信号，反射勘探地震成像方法可以有效地揭示不整合面下隐伏逆冲断层的空间展布形态，辨识地质透镜体存在。研究表明，选用主频为150 Hz 的高频率震源信号，可以使勘探达到最佳的分辨效果。
침대불정합계면하적역충단층진행반사지진감탐적가행성문제，진행료일항파동방정정연모의수치시험。감탐적지질목표포괄단층적단면형태，이급부근궤개후도부부위궤미적지질투경체。근거장악적지질자료건입지진삼수모형，용파동방정정연모의기술모방지진감탐관측계통적시공방식，곤동방포합성료38포지진수거，연후안조생산자료처리류정대저사수거진행처리，최후득도지진파속도모형부면、지진수거첩가부면이급편이부면등도상성과。시험결과표명，여과채용교고빈솔적진원신호，반사감탐지진성상방법가이유효지게시불정합면하은복역충단층적공간전포형태，변식지질투경체존재。연구표명，선용주빈위150 Hz 적고빈솔진원신호，가이사감탐체도최가적분변효과。
A numerical experiment using seismic wave equation forward modeling was carried out to test the feasibility of re-flection seismic exploration of a thrust underlying an unconformity.The geological targets for the exploration include the fault and a few geological lenses as thin as only a few meters.Using the geological information available,a seismic model was built. Seismic wave equation forward modeling was then performed to mimic the approach of seismic acquisition.In total 38 shot gath-ers of seismic data were synthesized.Then data processing yielded a seismic velocity profiles,a CDP stack profile and a migra-tion profile.The experiment results show that,if high frequency source signals are used,seismic reflection exploration can ef-fectively reveal the thrust fault and the geological lenses.Our experiments show that using source signals with dominant fre-quency at 150Hz can achieve the best resolution.