辽河外围盆地张强地区连片叠前时间偏移处理
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摘要
张强工区属辽河外围盆地,受地表条件的影响和地下地质构造的限制,资料处理受到了极大地困扰,虽然野外施工采取了很多有针对性的措施,但部分实测资料信噪比仍然较低,对资料处理造成了一定影响。笔者根据实测资料特点,针对叠前时间偏移处理要求,对叠前数据进行净化处理,建立准确的三维速度场,选择合适的偏移参数,经试验得到了一套合理的处理流程。叠前时间偏移结果表明,剖面的断点、断层清楚,绕射波归位准确;与老资料比较,信噪比和分辨率大大地提高,深层成像效果明显改善,较好地反映构造形态和地层结构,满足后续解释和反演的需求。
Zhangqiang area,which belongs to Liaohe peripheral basins,is restricted by the influence of the surface conditions and underground geological structure,and hence data-processing has met with great difficulties.Lots of targeted measures have been taken in field acquisition,but part of the original data signal-to-noise ratio remains low,causing a certain impact on data processing.According to the characteristics of the original data for PSTM,the prestack data purification was conducted,and the accurate three-dimensional velocity field and the appropriate parameters were established to obtain a reasonable process flow.PSTM results show that the profile's breakpoint and fault are clear,and the homing of the diffracted wave was accurate.A comparison with the old data shows that the signal-to-noise ratio,resolution and deep imaging are improved significantly and can better reflect the structural form and stratigraphic architecture and meet the demand of the subsequent interpretation and inversion.
Zhangqiang area,which belongs to Liaohe peripheral basins,is restricted by the influence of the surface conditions and underground geological structure,and hence data-processing has met with great difficulties.Lots of targeted measures have been taken in field acquisition,but part of the original data signal-to-noise ratio remains low,causing a certain impact on data processing.According to the characteristics of the original data for PSTM,the prestack data purification was conducted,and the accurate three-dimensional velocity field and the appropriate parameters were established to obtain a reasonable process flow.PSTM results show that the profile's breakpoint and fault are clear,and the homing of the diffracted wave was accurate.A comparison with the old data shows that the signal-to-noise ratio,resolution and deep imaging are improved significantly and can better reflect the structural form and stratigraphic architecture and meet the demand of the subsequent interpretation and inversion.
引文
[1]赵政彰.地震资料叠前时间偏移处理技术研讨会文集[M].北京:石油工业出版社,2005.
[2]王克斌,曹孟起,张玮,等.连片叠前偏移处理技术与应用实践[M].北京:石油工业出版社,2008.
[3]王锡文,秦广胜,刘向东,等.叠前偏移技术在中原复杂断块区的应用[J].地球物理学进展,2005,20(4):1092-1098
[4]王西文,刘全新,吕焕通,等.相对保幅的地震资料连片处理方法研究[J].石油物探,2006,45(2):105-120.
[5]裴江云,张丽艳,王丽娜,等.松辽盆地深层地震资料叠前时间偏移连片处理技术研究[J].地球物理学报,2011,54(2):294-303.
[2]王克斌,曹孟起,张玮,等.连片叠前偏移处理技术与应用实践[M].北京:石油工业出版社,2008.
[3]王锡文,秦广胜,刘向东,等.叠前偏移技术在中原复杂断块区的应用[J].地球物理学进展,2005,20(4):1092-1098
[4]王西文,刘全新,吕焕通,等.相对保幅的地震资料连片处理方法研究[J].石油物探,2006,45(2):105-120.
[5]裴江云,张丽艳,王丽娜,等.松辽盆地深层地震资料叠前时间偏移连片处理技术研究[J].地球物理学报,2011,54(2):294-303.
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