静校正技术在改善地震弱反射叠加质量中的应用

The Application of Static Correction Technique in Improving the Stack Quality of Weak Reflection of Seism

摘要: 研究区块位于塔里木盆地塔中隆起带桑塔木地区，地表条件复杂，地貌变化频繁，地形总体平坦，但局部差异较大，有效砂岩储层厚度较薄，平面分布差异大，非均质性强，导致静校正问题突出。层析静校正技术和分层地表一致性静校正技术能够改善速度谱质量，提高弱反射信号强度和叠加剖面同向轴连续性。该技术在研究区的应用结果表明，成果数据体沿层切片展现了沉积体的整体连续性，且井震结合标定符合度较高，改善了地震弱反射叠加剖面的品质，提高了成像质量，为该区的地震地质解释提供了正确依据。

Abstract: The research area was located in Santamu Area of Tazhong Uplift Belt of Tarim Basin, where the surface conditions were complex, the landscape changed frequently, the terrain was generally flat with large local differences. The thickness of the effective sandstone reservoir was thinner; the plane distribution was very different with strong heterogeneity; these induced obviously problems in static correction. Tomographic static correction technology and stratified surface consistency static correction technology could improve the quality of velocity spectrum, weak reflection signal intensity and co-axial continuity of stack profile. The application results of the technology in the study area illustrate that the obtained data body shows the overall continuity of the sediment, and the logging-seismic calibration has higher conformity, which improves the quality of the seismic weak reflection stack profile and the imaging quality. It also provides the correct basis for the seismic and geological interpretation of the area.