固定剥离面静校正技术在山前带模型试验中的应用研究
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摘要
分析了山前带地区近地表地震地质条件的特点,探讨了影响山前带地区构造不确定的因素,在此基础上提出了固定剥离面静校正处理技术。设计了一个典型的山前带二维速度模型,基于其数值模拟数据,对固定剥离面静校正技术的剥离量、剥离深度、充填速度进行了分析,并讨论了应用该技术的必要性。将该静校正技术应用于正演模拟数据的深度偏移处理中,并与常规静校正技术得到的深度偏移剖面进行了对比分析,结果表明,该技术能有效地提高近地表静校正精度、速度分析精度和构造落实的可靠性。
The characteristics of near surface seismic geologic conditions at piedmont zone were analyzed,and the factors causing the uncertainty of structures imaging in piedmont zone were probed.On the basis,fixed stripping-surface statics technique was proposed,a typical 2-D velocity model of piedmont zone was designed.Then,based on numerical simulation data,the overburden amount,stripping depth,filling velocity and the necessity for applying fixed stripped-surface statics was analyzed.The proposed statics technique was used in depth migration,and the result was compared to the depth migration profile after conventional statics technique.The results showed that the proposed technique can effectively improve the accuracy of near surface statics,the accuracy of velocity analysis,and the reliability of structure imaged.
The characteristics of near surface seismic geologic conditions at piedmont zone were analyzed,and the factors causing the uncertainty of structures imaging in piedmont zone were probed.On the basis,fixed stripping-surface statics technique was proposed,a typical 2-D velocity model of piedmont zone was designed.Then,based on numerical simulation data,the overburden amount,stripping depth,filling velocity and the necessity for applying fixed stripped-surface statics was analyzed.The proposed statics technique was used in depth migration,and the result was compared to the depth migration profile after conventional statics technique.The results showed that the proposed technique can effectively improve the accuracy of near surface statics,the accuracy of velocity analysis,and the reliability of structure imaged.
引文
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12王建民,王丽娜,裴江云,等.波场延拓速度分析[J].地球物理学进展,2004,19(2):420-423
2郑鸿明,杨晓海,崔琴,等.基准面校正的理论研究及误差分析[J].新疆地质,2005,23(1):79-81
3林伯香,孙晶梅,徐颖.不同周期的地形起伏分量对叠加速度的影响[J].石油物探,2004,43(2):130-134
4徐凌,崔兴福,齐莉,等.复杂近地表层析反演与波场延拓联合基准面校正[J].石油物探,2007,46(3):226- 230
5徐常练,许云,乌达巴拉.浅层速度横向变化对深层速度分析的影响[J].石油地球物理勘探,1999,34(4): 457-464
6邬达理.多井VSP资料在复杂地表区静校正处理中的应用[J].石油物探,2008,47(5):483-487
7戴晓云,刘在枢,金玉洁.复杂构造区叠加速度分析[J].石油地球物理勘探,2007,42(1):66-69
8熊翥.复杂地区地震数据处理思路[M].北京:石油工业出版社,2002.10-26
9孙开峰,管路平,韩革华,等.密点速度分析方法在新疆亚肯北部地区速度分析中的应用[J].石油物探,2005, 44(5):468-470
10刘治凡,毛海波,邵雨,等.复杂地表区基准面和静校正方法的选择[J].石油物探,2003,42(2):240-247
11林伯香,孙晶梅,刘起弘,等.关于浮动基准面概念的讨论[J].石油物探,2005,44(1):94-97
12王建民,王丽娜,裴江云,等.波场延拓速度分析[J].地球物理学进展,2004,19(2):420-423
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