Kirchhoff叠前时间偏移技术在唐河低凸起的应用
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摘要
唐河低凸起地层破碎,构造复杂,横向速度变化较大,信噪比低,叠后成像效果不佳,难以满足解释的需要。而Kirchhoff叠前时间偏移原理简单、实现容易、计算效率高、对观测系统适应性强,输出的共成像点道集非常适合倾角地层的速度分析,是解决复杂构造成像的有效手段。为了查清该区主要断裂展布、构造发育特征以及地层接触关系,对该区地震资料进行了叠前时间偏移处理。在实际应用中,通过精细的叠前预处理、建立合理的偏移速度场、优选偏移参数,大幅度提高了低凸起的成像精度,为该区的勘探和开发提供了高品质的地震资料,取得了明显的地质效果。
The Tanghe low uplift is stave, the structure is complex, the lateral velocity change is big, the signal-to -noise ratio is low, after stack imaging effect is not good, which can't satisfy the interpretation need, But for Kirchhoff pre-stack migration, the principle is simple, easy to realize, calculating efficiency is high, compatible to observation system, the output image gather is very suitable for inclined angle layer velocity analysis, and it is the effective measure for complex structure image formation. In order to investigate the regional fault distribution, the structure growth characteristic as well as the stratum contact relations, we carried on pre-stack migration to regional seismic data. In the practical application, we carried on fine pre-stack pre treatment, established reasonable displacement velocity field, optimized displacement parameter, which greatly increased the low uplift image formation precision, and has provided the high quality seismic data for this area exploration and the development and has made the obvious geological progress.
The Tanghe low uplift is stave, the structure is complex, the lateral velocity change is big, the signal-to -noise ratio is low, after stack imaging effect is not good, which can't satisfy the interpretation need, But for Kirchhoff pre-stack migration, the principle is simple, easy to realize, calculating efficiency is high, compatible to observation system, the output image gather is very suitable for inclined angle layer velocity analysis, and it is the effective measure for complex structure image formation. In order to investigate the regional fault distribution, the structure growth characteristic as well as the stratum contact relations, we carried on pre-stack migration to regional seismic data. In the practical application, we carried on fine pre-stack pre treatment, established reasonable displacement velocity field, optimized displacement parameter, which greatly increased the low uplift image formation precision, and has provided the high quality seismic data for this area exploration and the development and has made the obvious geological progress.
引文
[1]刘定进,印兴耀.傅里叶有限差分法保幅叠前深度偏移方法[J].地球物理学报,2007,50(1):268-276.
[2]张继国,刘连升.复杂区初至层析反演静校正[J].石油地球物理勘探,2006,41(4):383-385,395.
[3]杨文采,李幼铭.应用地震层析成像[M].北京;地质出版社,1993:11-46.
[4]渥.伊尔马兹.地震资料分析——地震资料处理、反演和解释[M].北京:石油工业出版社,2006:10-120
[5]曹延军.叠前时间偏移技术及应用[J].断块油气田,2004,11(5):21-22.
[2]张继国,刘连升.复杂区初至层析反演静校正[J].石油地球物理勘探,2006,41(4):383-385,395.
[3]杨文采,李幼铭.应用地震层析成像[M].北京;地质出版社,1993:11-46.
[4]渥.伊尔马兹.地震资料分析——地震资料处理、反演和解释[M].北京:石油工业出版社,2006:10-120
[5]曹延军.叠前时间偏移技术及应用[J].断块油气田,2004,11(5):21-22.
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