哈萨克斯坦滨里海盆地盐下成像技术应用研究
|
摘要
哈萨克斯坦滨里海盆地盐下地震勘探存在盐丘屏蔽、干扰波发育、反射波能量弱、先验资料缺乏以及因速度异常引起的构造假象等问题。通过合理组织处理流程,有效压制了面波干扰、规则干扰、强能量干扰和随机噪声干扰;采用由粗到细的思路,先利用谱分析方法建立宏观速度场,再利用射线层析成像方法提高速度分析精度,建立了较为准确的速度模型;利用频率-空间域有限差分叠前深度偏移解决了盐下及盐丘侧翼的成像问题。上述特色处理技术的应用,使得哈萨克斯坦滨里海盆地盐下及盐丘侧翼反射清楚,有效消除了由速度异常造成的构造假象。
There exist some problems in subsalt seismic exploration of Caspian seashore basin,such as salt doom screening,interference wave development,weak energy of reflected wave,shortage of pri- or data and pseudo-structures caused by velocity anomaly,etc.Ai- ming at these problems,we have designed the processing workflow to effectively suppress the surface wave interference,regular inter- ference,high energy interference,and other random noise interfer ence.The treatment clue was from thick to thin.Firstly,the spec- tral analysis method was used to establish macroscopic velocity field.Then,the ray tomography method was used to enhance the accuracy of velocity analysis and to establish a more accurate veloci- ty model.Finally,the finite difference pre-stack depth migration method in f-k domain was adopted to solve the imaging problem of subsalt and salt dome flank.The data processing result demon- strates that using the above treatment scheme can clearly image the subsalt and salt dome flank and effectively remove the structure ar tifacts caused by the velocity anomaly.
There exist some problems in subsalt seismic exploration of Caspian seashore basin,such as salt doom screening,interference wave development,weak energy of reflected wave,shortage of pri- or data and pseudo-structures caused by velocity anomaly,etc.Ai- ming at these problems,we have designed the processing workflow to effectively suppress the surface wave interference,regular inter- ference,high energy interference,and other random noise interfer ence.The treatment clue was from thick to thin.Firstly,the spec- tral analysis method was used to establish macroscopic velocity field.Then,the ray tomography method was used to enhance the accuracy of velocity analysis and to establish a more accurate veloci- ty model.Finally,the finite difference pre-stack depth migration method in f-k domain was adopted to solve the imaging problem of subsalt and salt dome flank.The data processing result demon- strates that using the above treatment scheme can clearly image the subsalt and salt dome flank and effectively remove the structure ar tifacts caused by the velocity anomaly.
引文
1李卫忠．张明震，王成礼．等．压制面波的波场分离方法[J]．石油地球物理勘探．1998．33(5)：679～690
2蔡希玲．声波和强能量干扰的分频自适应检测与压制方法[J]．石油地球物理勘探．1999，34(4)：373～380
3吕景贵．刘振彪．管叶君，等．压制叠前相干噪音的速度变换域滤波方法[J]．石油物探．2001．40(4)：94～99
4吕景贵．基于速度的波场变换叠前噪音压制处理技术方法研究[D]．北京：中国地质大学．2000
5王成礼．尚新民．基于参变量的波场变换方法与应用[J]．石油地球物理勘探，1995．30(1)：75～85
6王成礼．k-x与τ-x波场变换及其初步应用[J]．石油地球物理勘探．1994．29(1)：37～47
7金胜汶，曹景忠．马在田，等．可分裂的三维陡倾角深度偏移算法[J]．地球物理学报．1996，39(4)：544～549
8刘超颖．大倾角有限差分深度偏移[J]．石油地球物理勘探．1992．27(8)：695～705
9刘洪．袁江华．陈景波．大步长波场深度延拓的理论[J]．地球物理学报，2006．49(6)：1779～1793
10刘洪．王秀闽．曾锐，等．单程波算子积分解的象征表示[J]．地球物理学进展．2007．22(2)：463～471
11程玖兵，王华忠，马在田．频率-空间域有限差分法叠前深度偏移[J]．地球物理学报，2001，44(3)：389～395
2蔡希玲．声波和强能量干扰的分频自适应检测与压制方法[J]．石油地球物理勘探．1999，34(4)：373～380
3吕景贵．刘振彪．管叶君，等．压制叠前相干噪音的速度变换域滤波方法[J]．石油物探．2001．40(4)：94～99
4吕景贵．基于速度的波场变换叠前噪音压制处理技术方法研究[D]．北京：中国地质大学．2000
5王成礼．尚新民．基于参变量的波场变换方法与应用[J]．石油地球物理勘探，1995．30(1)：75～85
6王成礼．k-x与τ-x波场变换及其初步应用[J]．石油地球物理勘探．1994．29(1)：37～47
7金胜汶，曹景忠．马在田，等．可分裂的三维陡倾角深度偏移算法[J]．地球物理学报．1996，39(4)：544～549
8刘超颖．大倾角有限差分深度偏移[J]．石油地球物理勘探．1992．27(8)：695～705
9刘洪．袁江华．陈景波．大步长波场深度延拓的理论[J]．地球物理学报，2006．49(6)：1779～1793
10刘洪．王秀闽．曾锐，等．单程波算子积分解的象征表示[J]．地球物理学进展．2007．22(2)：463～471
11程玖兵，王华忠，马在田．频率-空间域有限差分法叠前深度偏移[J]．地球物理学报，2001，44(3)：389～395
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心