GeoEast-Lightning叠前深度偏移软件在准噶尔盆地南缘的应用

Application of GeoEast-Lightning prestack depth migration software in southern margin of Junggar Basin

在简要介绍GeoEast-Lightning叠前深度偏移软件的Kirchhoff叠前深度(Q)偏移、高斯射束叠前深度偏移、单程波波动方程叠前深度(Q)偏移方法的基础上,对比分析了不同叠前深度偏移方法在准噶尔盆地南缘呼图壁三维地震工区的应用效果,以期为类似工区地震资料处理提供借鉴。结果表明:①Kirchhoff叠前深度(Q)偏移技术在实际生产中普遍应用,但它对复杂构造的成像能力及成像精度有限;②高斯束深度偏移克服积分法偏移精度不高的问题,保留了积分法偏移高效、灵活的特点,相比波动方程偏移计算效率大大提高;③单程波深度(Q)偏移方法耗时短、效率高,适应大多数具有一定倾角的地层成像。

This paper briefly introduces Kirchhoff prestack depth(Q)migration,Gaussian beam prestack depth migration,and one-way wave equation prestack depth(Q)migration of GeoEast-Lightning prestack depth migration software.Then,the application effects of different prestack depth migration methods in the Hutubi 3D seismic area in the southern margin of Junggar Basin are compared and analyzed to provide references for seismic data processing in similar areas.The results are as follows.①Kirchhoff prestack depth(Q)migration technique is widely employed in practical production,whereas its imaging ability and accuracy for complex structures are limited.②The Gaussian beam depth migration overcomes the low accuracy of the integral migration method and retains the efficiency and flexibility of the integration method.Compared with wave equation migration,its computational efficiency is greatly improved.③The one-way wave equation prestack depth(Q)migration method is efficient with less time consumed and is suitable for imaging in most geological conditions with a certain dip angle.