RESEARCH

研究兴趣 | Research Interests

以“岩石圈与含油气盆地地震成像”作为研究方向,联合地震学、地质学与岩石物理学理论与方法,考虑地球介质的弹性非均匀性、各向异性和地震频带内的衰减性质,研究针对主动源和被动源地震波的新型成像和反演方法,提升对岩石圈、俯冲带、沉积盆地和油气储层的高分辨率探测以及油气资源开发和温室气体填埋的地震监测能力。
My team focuses on seismic imaging of the lithosphere and petroleum basin using the theories and approaches of seismology, geology and rock physics. Taking into account elastic heterogeneity and anisotropy of the Earth’s media as well as intrinsic attenuation within seismic frequency-band, we make efforts for developing advanced imaging and inversion techniques for active- and passive-source seismic data. The objectives include promoting the capability to characterize the lithosphere, subduction belts, sedimentary basin and petroleum reservoirs with high-resolution, and to monitor the production of petroleum and geothermal resources and the injection of CO2.

1) 地震体波模式分解及其意义 Seismic body-wave mode decomposition and its significance

  • Novel description of wave propagation in anisotropic media
  • P/S separation of multicomponent seismograms on free-surface or at ocean bottom
  • Elastic body-wave mode decomposition in isotropic and anisotropic media
  • Mode decomposition-based (least-squares) elastic reverse time migration (E-RTM/E-LSRTM)
  • Mode decomposition-based elastic wave-equation migration velocity analysis (E-WEMVA)
  • Mode decomposition-based elastic full waveform inversion (E-FWI)
  • Mode decomposition-based elastic reflection waveform/traveltime inversion (E-RWI/E-RTI)

2) 全方位局部角度域地震成像 Full-azimuth local angle-domain seismic imaging

  • Azimuth-preserved local angle-domain prestack time migration for 3D anisotropic media
  • Ray-theory-based angle-domain (Kirchhoff, Gaussian Beam) prestack depth migration and tomography
  • Wave-equation-based angle-domain prestack depth migration and tomography
  • Azimuthal anisotropy and fracture/stress characterization
  • Basin-scale velocity-model building using geologic and rock physics constraints

3) 地震波本征衰减 Intrinsic attenuation of seismic waves

  • Mechanism, rock physical model of seismic intrinsic attenuation
  • Seismic imaging and inversion in visco-acoustic, anelastic media
  • 4)被动源地震与岩石圈成像Passive-source seismic and imaging of lithosphere

    • Earthquake/microseismic source location and mechanism
    • Imaging of lithoshphere using regional and teleseismic signals

    国际合作 | International Partners

代表性研究成果 | Representative Contribution

针对现代的地震观测方式,摆脱传统声介质地震波成像理论的束缚,以弹性非均匀性与各向异性、体波模式解耦、矢量保真、全方位局部角度域成像以及纵横波速度多尺度反演重构为突破口,取得一系列促进岩性油气藏勘探的创新理论和方法技术成果。具体体现在以下四个方面:
1.标量各向异性波场传播理论:采用渐近极化投影思想,推导出适合标量各向异性地震波传播描述的伪纯模式波动方程,克服了经典拟声各向异性理论不适用于横波的缺陷,为多分量地震纵、横波成像/反演提供了优秀的传播引擎。
2.各向异性弹性波模式解耦与矢量成像:首次构建出非均匀各向异性介质弹性波模式解耦的混合域积分算子,采用低秩分解技术成功突破长期制约人们的计算瓶颈;进一步提出了适应各向异性介质的弹性波逆时偏移矢量成像条件,克服了一直困扰转换波成像的极性反转问题。
3.局部角度域方位保真叠前偏移成像:针对复杂小断层、天然裂缝与碳酸盐岩溶岩孔洞缝、断溶体等小尺度非均匀体原位高分辨率刻画、岩性与流体分布预测,提出了一系列面向宽方位三维地震、适应各向异性介质的角度域方位保真叠前偏移成像方法,向业界提供的技术模块在塔里木与四川盆地获得良好的示范效果。
4.以模式解耦为核心的弹性参数多尺度反演:基于P/S模式解耦实现反射波核函数的分解与筛选,压制正传和伴随波场非物理模式转换,建立全新的弹性反射走时与波形反演(E-RTI/E-RWI)方法,联合反射与透射P波、S波数据多尺度重构纵横波速度的低、中、高波数成分;同时提出模式解耦预条件的弹性全波形反演(E-FWI)方法,有效压制纵横波速度之间的trade-off效应,为弹性参数模型宽谱重建提出了新思路。
此外,也曾在广角单程波传播算子、双平方根单程波叠前深度偏移、起伏地表波动方程叠前深度偏移以及角度域振幅保真成像等方面做出了有新意的工作。