针对冀东南堡4号中浅层河道砂体识别的提高分辨率处理
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摘要
南堡4号构造中浅层纵向发育多套含油层系、含油井段长,但是单油层厚度薄,平面上油层分布零散,地震剖面上分辨率低,不利于开展河道砂体预测工作。根据实际地震资料特点,以原始资料野外采集频宽为依据,采用了VSP井驱动Q补偿、高保真分频去噪、分频剩余静校正、井约束反褶积以及优势频带反褶积等技术手段,在高保真保幅的基础上逐步拓宽频带提高信噪比及分辨率,最终提高了井震吻合程度,达到了河道砂体预测要求。
Middle-shallow Layers in Nanpu 4 structure developed multiple sets of oil-bearing strata vertically,which are characterized by long oil-containing segments in oil wells,thin thickness of single oil layer and scattered distribution laterally as well.The relatively low resolution seismic data is not adequate for effective prediction of channel sand body reservoirs.Based on characteristics of true seismic data,restricted by the acquisition frequency bandwidth,such targeted techniques as VSP well-driven Q-compensation,high fidelity frequency division denoising,frequency division residual static correction,well-constrained deconvolution and dominant frequency band constrained deconvolution are applied to the seismic data processing procedure,in order to widen frequency band,improve signal-to-noise ratio and enhance seismic resolution step by step,on the premise of ensuring seismic data's high fidelity which can be verified by well-seismic coincidence.As a result,the final seismic data can well meet geological demand of effective prediction of channel sand body reservoirs.
Middle-shallow Layers in Nanpu 4 structure developed multiple sets of oil-bearing strata vertically,which are characterized by long oil-containing segments in oil wells,thin thickness of single oil layer and scattered distribution laterally as well.The relatively low resolution seismic data is not adequate for effective prediction of channel sand body reservoirs.Based on characteristics of true seismic data,restricted by the acquisition frequency bandwidth,such targeted techniques as VSP well-driven Q-compensation,high fidelity frequency division denoising,frequency division residual static correction,well-constrained deconvolution and dominant frequency band constrained deconvolution are applied to the seismic data processing procedure,in order to widen frequency band,improve signal-to-noise ratio and enhance seismic resolution step by step,on the premise of ensuring seismic data's high fidelity which can be verified by well-seismic coincidence.As a result,the final seismic data can well meet geological demand of effective prediction of channel sand body reservoirs.
引文
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[7]安西峰,刘平,张旭.地表一致性反褶积在地震勘探中的应用及效果[J].地球物理学进展,2010,25(6):2125-2129.AN X F,LIU P,ZHANG X.Application of surface consistent deconvolution to seismic prospecting and its Effect[J].Progress in Geophysics,2010,25(1):2125-2129.(In Chinese)
[8]陈双全,李向阳.联合垂直地震剖面资料提高地面地震资料分辨率的应用研究[J].中国石油大学学报(自然科学版),2012,36(3):65-68.CHEN S Q,LI X Y.Application of improving surface seismic resolution using vertical-seismic-profile data[J].Journal of China University of Petroleum(Edition of Natural Science),2012,36(3):65-68.(In Chinese)
[9]崔永福,吴国忱,郭伟,等.井控谱约束反褶积方法及其应用[J].石油地球物理勘探,2015,50(5):854-860.CUI Y F,WU G C,GUO W,et al.Well controlled and spectral constrained deconvolution method and its application[J].Oil Geophysical Prospecting,2015,50(5):854-860.(In Chinese)