面向薄互储层的叠前宽频保幅处理技术
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摘要
我国陆上薄互储层有效储层砂岩厚度一般小于5 m,砂体规模小,储层地震响应特征不明显,地震有效识别该类储层难度较大。地震资料处理中通常采用提高分辨率处理,实现对薄储层的识别,过分提高分辨率又破坏地震资料保真度。针对这一问题,采用叠前地震资料宽频保幅处理技术,在保幅处理的基础上充分应用分频处理技术有效提高地震资料高频段的信噪比,并针对高分辨处理的特殊要求,采用两步法反褶积、空变Q补偿等来拓宽地震资料有效频带。该项技术目前在大庆长垣扶余油层取得较为理想的应用效果,目的层有效频带拓宽(10—15)Hz。
The effective thickness of the Chinese onshore thin interbed reservoir is generally less than 5 meters,the size of the sand body is small.Reservoir seismic response characteristics is not obviously,and very difficult to effectively identify such reservoir.Therefore,high resolution process is commonly adopted in seismic data processing to identify this thin interbed reservoir,but the problem is that excessively increasing resolution will destroy the amplitude of seismic data.On the basis of preserved amplitude processing,this technology of the frequency spliting processing method is adopted to improve the high-band frequency signal-to-noise ratio of seismic data,and for the special requirements of high-resolution processing,the two-step deconvolution method,spatially variable Q inverse compensation is used to broaden the seismic data effective frequency band.This technology has gotten effective application in thin interbed layer of Daqing oil field,and the effective frequency band of target layer has broaden the(10—15) Hz.
The effective thickness of the Chinese onshore thin interbed reservoir is generally less than 5 meters,the size of the sand body is small.Reservoir seismic response characteristics is not obviously,and very difficult to effectively identify such reservoir.Therefore,high resolution process is commonly adopted in seismic data processing to identify this thin interbed reservoir,but the problem is that excessively increasing resolution will destroy the amplitude of seismic data.On the basis of preserved amplitude processing,this technology of the frequency spliting processing method is adopted to improve the high-band frequency signal-to-noise ratio of seismic data,and for the special requirements of high-resolution processing,the two-step deconvolution method,spatially variable Q inverse compensation is used to broaden the seismic data effective frequency band.This technology has gotten effective application in thin interbed layer of Daqing oil field,and the effective frequency band of target layer has broaden the(10—15) Hz.
引文
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2王西文,赵邦六,等.地震资料相对保真处理方法研究,石油物探.2009;48(4):319—331
3王建民,王元波,等.高分辨率三维地震勘探技术及其应用.大庆石油地质与开发,2009;28(5):282—287
4宋常洲,张旭明.地震资料高分辨率处理技术应用.石油地球物理勘探,2009;44(增刊1):44—48
5高军,凌云,等.相对保持储层信息的地震数据处理及其地球物理与地质监控.石油物探,2010;49(5):451—459
6 Canning A,Gardner G H F.Reducing 3—D acquisition footprint for3—D DMO and 3—D prestack migration.Geophysics,1998;4:1177—1183
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