【目的】随着深部资源勘探开发的重要性不断提高,对高精度地震勘探提出了新要求。针对具有强各向异性的含煤地层,传统基于各向同性的资料处理方法不再适用。【方法】提出一种基于水平横向各向同性介质(Transverse Isotropy Medium with ...【目的】随着深部资源勘探开发的重要性不断提高,对高精度地震勘探提出了新要求。针对具有强各向异性的含煤地层,传统基于各向同性的资料处理方法不再适用。【方法】提出一种基于水平横向各向同性介质(Transverse Isotropy Medium with Vertical Symmetry Axis,VTI)和方位各向异性介质(Transverse Isotropy with Horizontal Axis of Symmetry,HTI)联合处理的地震数据处理方法。首先,针对含煤地层沉积特征,分析VTI介质特点,采用高阶动校正处理,可以有效消除各向异性在大偏移距数据中引起的同相轴弯曲,保证共反射点远近道能达到同相,提高数据叠加成像质量。其次,针对构造裂隙发育特征,立足于HTI介质的方位各向异性分析,采用OVT域处理方法,通过建立方位各向异性参数场去除不同方位角差异对数据的影响。联合应用上述2种处理方法,通过制定合理的处理流程,优选关键参数,搭建一套实用的、适合目标地层的各向异性处理校正方法,解决含煤地层在复杂条件下的速度分析、叠加等问题,从而提高煤系地震数据的分辨率和解释精度。【结果和结论】实际应用结果表明,新方法获得的地震数据主频更高、频带更宽,在小构造特征识别和古地理环境刻画方面更具优势,为精细地质解释提供了有力支撑。同时也强调了对含煤地层进行各向异性处理的必要性,推动各向异性处理技术的在宽方位地震勘探中的应用。展开更多
This paper proposes a flux mapping method directly using the higher order harmonics (HOH) of the neutronics equation of the nominal core. The bi-orthogonality and completeness of the HOH set are studied. and they are ...This paper proposes a flux mapping method directly using the higher order harmonics (HOH) of the neutronics equation of the nominal core. The bi-orthogonality and completeness of the HOH set are studied. and they are the theoretical basis for the flux mapping method. Using the bi-orthogonality of HOH and the strict formula for eigenvalue estimation. the process and formulas for HOH calculation called as the source iteration method with source correction are derived. The analysis can predict any order of harmonics for 2-or 3-dimensional geometries.Preliminary verification of the capability for flux mapping is also given. and other applications of HOH for reactor operation analysis and failure diagnosis are underway.展开更多
文摘【目的】随着深部资源勘探开发的重要性不断提高,对高精度地震勘探提出了新要求。针对具有强各向异性的含煤地层,传统基于各向同性的资料处理方法不再适用。【方法】提出一种基于水平横向各向同性介质(Transverse Isotropy Medium with Vertical Symmetry Axis,VTI)和方位各向异性介质(Transverse Isotropy with Horizontal Axis of Symmetry,HTI)联合处理的地震数据处理方法。首先,针对含煤地层沉积特征,分析VTI介质特点,采用高阶动校正处理,可以有效消除各向异性在大偏移距数据中引起的同相轴弯曲,保证共反射点远近道能达到同相,提高数据叠加成像质量。其次,针对构造裂隙发育特征,立足于HTI介质的方位各向异性分析,采用OVT域处理方法,通过建立方位各向异性参数场去除不同方位角差异对数据的影响。联合应用上述2种处理方法,通过制定合理的处理流程,优选关键参数,搭建一套实用的、适合目标地层的各向异性处理校正方法,解决含煤地层在复杂条件下的速度分析、叠加等问题,从而提高煤系地震数据的分辨率和解释精度。【结果和结论】实际应用结果表明,新方法获得的地震数据主频更高、频带更宽,在小构造特征识别和古地理环境刻画方面更具优势,为精细地质解释提供了有力支撑。同时也强调了对含煤地层进行各向异性处理的必要性,推动各向异性处理技术的在宽方位地震勘探中的应用。
文摘This paper proposes a flux mapping method directly using the higher order harmonics (HOH) of the neutronics equation of the nominal core. The bi-orthogonality and completeness of the HOH set are studied. and they are the theoretical basis for the flux mapping method. Using the bi-orthogonality of HOH and the strict formula for eigenvalue estimation. the process and formulas for HOH calculation called as the source iteration method with source correction are derived. The analysis can predict any order of harmonics for 2-or 3-dimensional geometries.Preliminary verification of the capability for flux mapping is also given. and other applications of HOH for reactor operation analysis and failure diagnosis are underway.
