马厂地区高精度地震采集观测系统方案设计
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摘要
2005年中原油田在东濮凹陷马厂地区开展了高精度三维地震勘探,观测系统方案的论证和选择是本次高精度地震的一个重要环节。利用正演模型技术分析了中原油田的主要观测系统类型,通过模拟数据对比,获得了通过增加空间采样密度来改善成像效果的认识。在马厂高精度地震采集观测系统设计过程中,通过对两套加密采样观测系统方案进行对比分析,确定了该地区观测系统。聚焦分析表明,马厂新观测系统振幅精度高、横向照明均匀,有利于最终结果的岩性识别。通过马厂高精度地震勘探的部署实施,最终地震成像质量得到显著改善,获得了很好的效果,同时也证明了观测系统设计的正确性。
In 2005,Zhongyuan Oilfield Company carried out high-precision 3D seismic exploration in Machang area of Dongpu sag,in which the design and demonstration of geometry scheme is a key step.The main geometries utilized in the sag in the past are first analyzed by using forward modeling techniques.By comparison of simulated data,the knowledge that imaging effects can be improved with increasing spatial sampling density is cognized.The acquisition geometry is determined by analyzing the two geometries with higher spatial sampling during the survey design of high-precision seismic exploration in the area.Focal analysis shows that the designed geometry has good property in amplitude accuracy and in horizontal illumination,which is favorable for lithology recognition in final seismic data.With the practice of high-precision seismic exploration in the area,imaging quality is significantly improved and very good results are achieved,which also proves the correctness of the geometry design.
In 2005,Zhongyuan Oilfield Company carried out high-precision 3D seismic exploration in Machang area of Dongpu sag,in which the design and demonstration of geometry scheme is a key step.The main geometries utilized in the sag in the past are first analyzed by using forward modeling techniques.By comparison of simulated data,the knowledge that imaging effects can be improved with increasing spatial sampling density is cognized.The acquisition geometry is determined by analyzing the two geometries with higher spatial sampling during the survey design of high-precision seismic exploration in the area.Focal analysis shows that the designed geometry has good property in amplitude accuracy and in horizontal illumination,which is favorable for lithology recognition in final seismic data.With the practice of high-precision seismic exploration in the area,imaging quality is significantly improved and very good results are achieved,which also proves the correctness of the geometry design.
引文
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[2]Biondo L.Biondi.3-D Seismic Imaging.Stanford University,2003:167～182.
[3]Vermeer.3-D Symmetric Sampling.Geophysics,1998,63(5):1629～1647.
[4]Canning A,Gardner G.Regularizing3-D data sets with DMO.Geophysics,1996,61(6):1103～1114.
[5]蔡其新,何佩军,秦广胜,等.有限差分数值模拟的最小频散算法及其应用[J].石油地球物理勘探,2003,38(3):247～251.
[6]赵改善.快速射线追踪算法[J].石油地球物理勘探,1991,26(2):145～151.
[7]Berkhout A J,et al.Comprehensive assessment of seismic acquisition geometries by focal beams.Geophysics,2001,66(3):911～931.
[8]Volker A W,et al.Analysis and optimization of3-D seismic acquisition geometries by focal beams,SEG2000Expanded Abstracts.
[9]狄邦让,王长春,顾培成,等.三维观测系统优化设计的双聚焦方法[J].石油地球物理勘探,2003,38(5):463～469.
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