薄互层地震响应及分频技术的适用性分析
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摘要
分频技术是目前开展薄互层预测的一种重要手段,但实际应用时问题比较多。试图通过正演模型开展薄互层地震响应特征分析来探讨分频技术的适用条件。认为与单砂层相比较,薄互层地震振幅与砂岩百分含量成指数关系,并含有更为丰富的频率信息;当薄互层组厚度小于1/4λ、总厚度变化小于1/8λ、砂岩百分含量变化小于20%时,可以应用分频技术开展薄互层储层预测。
Spectral decomposition is widely used in the thin-interbed prediction,though the condition of suitable applicability is not clear.In this paper,we build a forward modeling of seismic response to thin-interbed and find the suitable condition of spectral decomposition.The forward modeling of seismic response to thin-interbed indicates that there would exist the exponential relationship between seismic amplitude and percentage of sandstone in thin-interbed,and more frequency information for the thin-interbed contains than single sand layer occur.On condition that the thickness of thin-interbed is thinner than λ/4,total vibration of thickness less than λ/8,sandstone percentages less than 20%,the spectral decomposition technology is useable in the prediction of thin-inerbed sandstone.
Spectral decomposition is widely used in the thin-interbed prediction,though the condition of suitable applicability is not clear.In this paper,we build a forward modeling of seismic response to thin-interbed and find the suitable condition of spectral decomposition.The forward modeling of seismic response to thin-interbed indicates that there would exist the exponential relationship between seismic amplitude and percentage of sandstone in thin-interbed,and more frequency information for the thin-interbed contains than single sand layer occur.On condition that the thickness of thin-interbed is thinner than λ/4,total vibration of thickness less than λ/8,sandstone percentages less than 20%,the spectral decomposition technology is useable in the prediction of thin-inerbed sandstone.
引文
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[8]Zhang Yufen,Xiong Weigang,Du Yulin.Application of timefrequency analysis method to thin reservoir lateral prediction[J].Geological Science and Technology Information,1995,14(1):83-88.[张玉芬,熊维纲,杜聿麟.时频分析方法在薄储集层横向预测中的应用[J].地质科技情报,1995,14(1):83-88.]
[9]Tian Renfei,Cao Junxing,Fang Lei.Time-frequency analysisand its application in gas-bearing reservoirs:A case from theLei 3 gas-bearing reservoir of Leikoupo Formation in a area ofcentral Sichuan[J].Natural Gas Geoscience,2008,19(2):272-275.[田仁飞,曹俊兴,方磊.时频分析技术及其在识别含气层中的应用——以川中某地区雷口坡组雷3含气层为例[J].天然气地球科学,2008,19(2):272-275.]
[10]Zhang Yufen.Factors analysis affecting seismic reflectioncharacteristics of thin interbedding[J].Geological Science andTechnology Information,1998,17(3):101-106.[张玉芬.影响薄互层地震反射波特征因素分析[J].地质科技情报,1998,17(3):101-106.]
[2]Du Shitong.The potentiality and limitation of seismic tech-nique identifying and describing ultra-thin reservoir[J].Petro-leum Geophysics,2004,2(4):49-58.[杜世通.地震技术识别与描述超薄储层的潜力与局限[J].油气地球物理,2004,2(4):49-58.]
[3]Zhu Qingrong,Zhang Yueqian,Yu Xinghe,et al.Applicationof spectra decomposition to reservoir characterization[J].Journal of Mineralogy and Petrology,2003,23(3):104-108.[朱庆荣,张越迁,于兴河,等.分频解释技术在表征储层中的应用[J].矿物岩石,2003,23(3):104-108.]
[4]Zhu Xiaoming,Xue Rongjun,Liu Xiwu,et al.The applicationof time-frequency analysis in process of seismic data enhance-ment[J].Inner Mongolia Petrochemical Industry,2007,(8):96-98.[朱晓明,薛荣俊,刘喜武,等.时频分析在地震数据处理中的应用[J].内蒙古石油化工,2007,(8):96-98.]
[5]Mu Zhiquan,Zhou Lihong,Pu Xiugang,et al.Application ofchannels tracing and prediction technique to fluvial facies sandbodies in Gangdong exploitation area[J].Natural Gas Geosci-ence,2009,20(2):263-268.[牟智全,周立宏,蒲秀刚,等.河流砂体追踪与预测技术——以港东开发区为例[J].天然气地球科学,2009,20(2):263-268.]
[6]Zhang Yanzhang,Yin Shoupeng,Zhang Qiaoling,et al.Geo-logic significance of the seismic spectral decomposition tech-nology and its application analysis[J].Petroleum Explorationand Development 2006,33(1):64-71.[张延章,尹寿鹏,张巧玲,等.地震分频技术的地质内涵及其效果分析[J].石油勘探与开发,2006,33(1):64-71.]
[7]Zhang Jinduo,Yang Ping,Wang Yunlei.Spectral decomposi-tion of seismic data and its application in oil&gas exploration[J].Progress in Exploration Geophysics,2006,29(4):235-238.[张进铎,杨平,王云雷.地震信息的谱分解技术及其应用[J].勘探地球物理进展,2006,29(4):235-238.]
[8]Zhang Yufen,Xiong Weigang,Du Yulin.Application of timefrequency analysis method to thin reservoir lateral prediction[J].Geological Science and Technology Information,1995,14(1):83-88.[张玉芬,熊维纲,杜聿麟.时频分析方法在薄储集层横向预测中的应用[J].地质科技情报,1995,14(1):83-88.]
[9]Tian Renfei,Cao Junxing,Fang Lei.Time-frequency analysisand its application in gas-bearing reservoirs:A case from theLei 3 gas-bearing reservoir of Leikoupo Formation in a area ofcentral Sichuan[J].Natural Gas Geoscience,2008,19(2):272-275.[田仁飞,曹俊兴,方磊.时频分析技术及其在识别含气层中的应用——以川中某地区雷口坡组雷3含气层为例[J].天然气地球科学,2008,19(2):272-275.]
[10]Zhang Yufen.Factors analysis affecting seismic reflectioncharacteristics of thin interbedding[J].Geological Science andTechnology Information,1998,17(3):101-106.[张玉芬.影响薄互层地震反射波特征因素分析[J].地质科技情报,1998,17(3):101-106.]
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