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双复杂条件下非倾斜叠加精确束偏移方法及应用I——声波方程

DOI: 10.6038/cjg20150124, PP. 267-276

Keywords: 双复杂,倾角信息,非倾斜叠加,束偏移,波动方程偏移

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Abstract:

近年来,油气勘探的重心正转向具有复杂地表和复杂地质体的双复杂区域.本文发展了一种精确的双复杂条件下基于地表倾角信息的非倾斜叠加束偏移方法,相对于传统束成像方法无需进行三方面处理:(1)高程静校正;(2)相位校正;(3)束中心与接收点之间关于速度和束出射角的近似替换,因而具有更高的成像精度.通过加拿大逆掩断层模型、中原油田断层模型及实际资料的偏移试算,并与传统束偏移及波动方程偏移成像结果对比可知:本文非近似束偏移方法在近地表、高陡倾等构造处的成像精度、反射界面成像振幅等方面优于传统的偏移方法,以此验证了本文非倾斜叠加精确束偏移方法的正确性、优越性及适应性.

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