对准噶尔盆地腹部地区地震成像的地震速度影响分析
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摘要
在准噶尔盆地腹部夏盐3井区存在时间域与构造域高低幅度差异大的问题。基于存在的问题,前期研究对该地区进行三维叠后重新处理和利用三维速度建模变速构造成图,为夏盐5井的钻探提供了决策依据。钻探后发现,夏盐5井构造高点并不存在,造成这些现象的原因是该地区构造复杂、地震速度横向变化大,常规叠后时间偏移不能使反射波正确归位,需要使用三维叠前深度偏移技术才能实现复杂目标区的高精度成像。研究指出速度建模是关键,并给出了相应的速度建模对策。解决了该地区构造深度与地震双程时间不一致的矛盾。为随后钻探的井提供了地质依据。
There existed a problem of big difference from high extent to low extent on time domain and tectonic domain in Well Xianyan 3. Based this problem, after the pre-research was carried on 3D poststack processing and a three-dimensional velocity model was used to build a variable velocity structure map, by which bases was provided for drilling the Well Xianyan 3 . After drilling, it was found that structural height of Well Xianyan 3 was not existed. The reason was that the structure was complicated, lateral change of seismic velocity was big and conventional poststack time migration could not make the reflective wave correctly migrate. It is pointed out that velocity stack is the key and a responding velocity modeling measure is provided, by which the disagreement of structural depth and dual seismic time in the area is solved,basis is provided for consequent well drilling.
There existed a problem of big difference from high extent to low extent on time domain and tectonic domain in Well Xianyan 3. Based this problem, after the pre-research was carried on 3D poststack processing and a three-dimensional velocity model was used to build a variable velocity structure map, by which bases was provided for drilling the Well Xianyan 3 . After drilling, it was found that structural height of Well Xianyan 3 was not existed. The reason was that the structure was complicated, lateral change of seismic velocity was big and conventional poststack time migration could not make the reflective wave correctly migrate. It is pointed out that velocity stack is the key and a responding velocity modeling measure is provided, by which the disagreement of structural depth and dual seismic time in the area is solved,basis is provided for consequent well drilling.
引文
[1]李振春,张军华.地震数据处理方法[M].东营:中国石油大学出版社,2004.1~2.
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[4]马在田.论反射地震偏移成像[J].勘探地球物理进展,2002,25(3):1~5.
[5]秦亚玲,郭朝斌,侯春丽,等.三维叠前深度偏移处理技巧与应用[J].江汉石油学院学报,2002,24(2):38~39.
[6]王锡文,秦广胜,陈君,等.叠前克希霍夫成像技术及其应用[J].江汉石油学院学报,2004,26(增刊):52~53.
[7]罗省贤,李录明.三维叠前深度偏移速度模型建立方法[J].石油物探,1999,38(4):1~6.
[2]邵雨,李学义,孔智勇,等.模型速度建场方法的应用研究[J].石油地球物理勘探,2003,38(6):675~679.
[3]易远元,袁三一.叠前深度偏移技术在李埠地区的应用[J].石油天然气学报,2006,28(3):66~68.
[4]马在田.论反射地震偏移成像[J].勘探地球物理进展,2002,25(3):1~5.
[5]秦亚玲,郭朝斌,侯春丽,等.三维叠前深度偏移处理技巧与应用[J].江汉石油学院学报,2002,24(2):38~39.
[6]王锡文,秦广胜,陈君,等.叠前克希霍夫成像技术及其应用[J].江汉石油学院学报,2004,26(增刊):52~53.
[7]罗省贤,李录明.三维叠前深度偏移速度模型建立方法[J].石油物探,1999,38(4):1~6.
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