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Global Geology 2016, 19(2) 95-101 DOI:
ISSN: 1673-9736 CN: 22-1371/P |
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��everse time migration based on normalized wavefield decomposition imaging condition |
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YU Jianglong, HAN Liguo, ZHOU Yan and ZHANG Yongsheng |
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1�� College of Geo- Exploration Science and Technology��Jilin University��Changchun 130026��China; 2�� Drilling Division��CNPC Offshore Engineering Corporation��Tianjin 300280��China |
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Abstract��
With the increasing complexity of prospecting objectives��reverse time migration (��TM) has attracted more and more attention due to its outstanding imaging quality�� ��TM is based on two- way wave equation�� so it can avoid the limits of angle in traditional one- way wave equation migration��image reverse branch�� prism waves and multi- reflected wave precisely and obtain accurate dynamic information�� However��the huge demands for storage and computation as well as low frequency noises restrict its wide application�� The normalized cross- correlation ima- ging conditions based on wave field decomposition are derived from traditional cross- correlation imaging condition�� and it can eliminate the low- frequency noises effectively and improve the imaging resolution�� The practical proce- dure includes separating source and receiver wave field into one- way components respectively��and conducting cross- correlation imaging condition to the post- separated wave field�� In this way��the resolution and precision of the imaging result will be promoted greatly�� |
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Keywords��
reverse time migration
low- frequency noises
imaging condition
wave field decomposition
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Received Revised Online: |
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