大阵列3D-VSP技术在大庆油田的应用
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摘要
大庆油田徐家围子火成岩气藏的成因与分布异常复杂,导致深层地震反射连续追踪困难,储层内幕难以识别。采用大阵列3D-VSP联合勘探可在井周围目标区形成高分辨率成像资料,获取更为直接的储层信息,因此具有独特优势。本文介绍了大庆徐深21-1井160级3D-VSP勘探技术应用实例:采集方面主要是针对目标体的观测系统优化设计和采集参数选择;数据处理中主要采用快速高精度3D-VSP初至拾取、矢量波场分离、各向异性参数反演、基于射线追踪的VSPCDP转换和叠后偏移成像等特色技术;最后对处理成果进行了深入分析和综合研究,结果显示大阵列3D-VSP资料在该区储层精细解释中具有良好应用效果。
Deep seismic events are hard to be tracked and the inner structures of reservoir are hard to be identified in XJWZ of Daqing Oil Field because the formation of volcanic gas reservoir and its spatial distribution are very complicated.With large-array 3D-VSP seismic,high precision images and some direct reservoir parameters can be acquired around the observation well.This paper shows a case study of 160-level 3D-VSP survey in Well XS21-1 of Daqing Oil Field.An objective oriented geometry and survey parameter optimization were introduced in data acquisition aspect.For data processing,we adopted a series of distinctive techniques including high precision auto-picking of 3D-VSP first breaks,vector wavefield separation,anisotropy parameter inversion,ray tracing-based VSPCDP mapping and migration.Finally,processing results were analyzed and interpreted.Results indicate that large-array 3D-VSP can be used for reservoir subtle interpretation effectively.
Deep seismic events are hard to be tracked and the inner structures of reservoir are hard to be identified in XJWZ of Daqing Oil Field because the formation of volcanic gas reservoir and its spatial distribution are very complicated.With large-array 3D-VSP seismic,high precision images and some direct reservoir parameters can be acquired around the observation well.This paper shows a case study of 160-level 3D-VSP survey in Well XS21-1 of Daqing Oil Field.An objective oriented geometry and survey parameter optimization were introduced in data acquisition aspect.For data processing,we adopted a series of distinctive techniques including high precision auto-picking of 3D-VSP first breaks,vector wavefield separation,anisotropy parameter inversion,ray tracing-based VSPCDP mapping and migration.Finally,processing results were analyzed and interpreted.Results indicate that large-array 3D-VSP can be used for reservoir subtle interpretation effectively.
引文
[1]Paulsson B et al.High resolution 3D seismic i magingusing 3C data from large downhole seismic arrays∥EAGE 66th Conference&Exhibition,2004
[2]Mishin V Aet al.Practice of 3D VSP data migration∥EAGE 69th Conference&Exhibition,2007
[3]Li Yan-peng et al.Refined P-wave i maging using largearray 3D VSP data∥EAGE71st Conference&Exhibi-tion,2009
[4]高少武,贺振华,赵波等.时间域单频干扰波消除方法的改进.石油地球物理勘探,2008,43(3):270~274Gao Shao-wu,He Zhen-hua,Zhao Bo et al.Improvementof method eli minating single-frequency interference wavein ti me domain.OGP,2008,43(3):270~274
[5]Thomsen L.Weak elastic anisotropy.Geophysics,1986,51(10):1954~1966
[6]Chen Gen-meng et al.Rapid VSP-CDP mapping of 3DVSP data.Geophysics,2000,65(5):1631~1640
[2]Mishin V Aet al.Practice of 3D VSP data migration∥EAGE 69th Conference&Exhibition,2007
[3]Li Yan-peng et al.Refined P-wave i maging using largearray 3D VSP data∥EAGE71st Conference&Exhibi-tion,2009
[4]高少武,贺振华,赵波等.时间域单频干扰波消除方法的改进.石油地球物理勘探,2008,43(3):270~274Gao Shao-wu,He Zhen-hua,Zhao Bo et al.Improvementof method eli minating single-frequency interference wavein ti me domain.OGP,2008,43(3):270~274
[5]Thomsen L.Weak elastic anisotropy.Geophysics,1986,51(10):1954~1966
[6]Chen Gen-meng et al.Rapid VSP-CDP mapping of 3DVSP data.Geophysics,2000,65(5):1631~1640
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