初至波表层模型层析反演静校正在吐哈盆地的应用
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摘要
吐哈盆地地震勘探工作多是在山地、山前带、沙漠、沟壑纵深区等低降速带变化大的复杂地区进行,静校正问题成为制约勘探成效的瓶颈问题。在研究各种新技术、新方法在吐哈盆地的实际应用效果时发现,基于初至波表层模型的层析反演静校正方法在实际地震资料处理中能较好地解决这一问题。该方法主要通过拾取地震初至波的到达时,依据初至信息或其他约束信息,建立初始模型、正演与实际初至时间相匹配的静校正模型,提高了静校正计算的精度,具有良好的实际应用效果。
Since seismic exploration of Tuha Basin is mainly carried out in mountainous region, foothill belt, desert, and gully region, where the variation of low velocity layer is rapid, static correction has become a bottleneck restricting the effect of exploration. By analyzing the effect of applying new techniques and methods to Tuha Basin, tomographic inversion and static correction of the first break in surface model are found to be more effective to solve the problem during processing real seismic data. By picking up arrival time of the first seismic break, the new approach establishes an initial model and a static correction model of which the forward initial time matches the practical initial time. Thus the precision of static correction calculation is high. The new approach is found to be of better application effect.
Since seismic exploration of Tuha Basin is mainly carried out in mountainous region, foothill belt, desert, and gully region, where the variation of low velocity layer is rapid, static correction has become a bottleneck restricting the effect of exploration. By analyzing the effect of applying new techniques and methods to Tuha Basin, tomographic inversion and static correction of the first break in surface model are found to be more effective to solve the problem during processing real seismic data. By picking up arrival time of the first seismic break, the new approach establishes an initial model and a static correction model of which the forward initial time matches the practical initial time. Thus the precision of static correction calculation is high. The new approach is found to be of better application effect.
引文
郭见乐、文雪康、刘连升,层析静校正技术在中国西部地区的应用,CPS/SEG北京2004国际地球物理会议暨展览论文。1
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[3]李录明,罗省贤,赵波.初至波表层模型层析反演[J].石油地球物理勘探,2000,35(5):559～564
[4]林伯香,孙晶梅,刘清林.层析成像低速带速度反演和静校正方法[J].石油物探,2002,41(2):136～140
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[1]李章明,刘贤功,王顺国,等.正交迭代静校正方法[J].石油地球物理勘探,1997,32(1):124～129
[2]王彦春,余钦范,李峰,等.交互迭代静校正[J].石油物探,1998,37(2):63～70
[3]李录明,罗省贤,赵波.初至波表层模型层析反演[J].石油地球物理勘探,2000,35(5):559～564
[4]林伯香,孙晶梅,刘清林.层析成像低速带速度反演和静校正方法[J].石油物探,2002,41(2):136～140
[5]杨文军,段云卿,姜伟才,等.层析反演静校正.物探与化探,2005,29(1):41～43
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