塔河油田三叠系碎屑岩储层地震分辨率及频谱特征理论分析
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摘要
塔河油田三叠系是由一系列砂泥薄互层组成。在分析塔河油田钻遇储层段储层厚度特征的基础上,导出了叠层砂体内一次反射波的时域反射脉冲响应的振幅谱关于砂体厚度以及叠层数的解析表达式,进而对不同砂体之间的间隔、不同砂体厚度组合变化时砂体反射振幅谱特征及其对应的地震合成记录特征进行了分析。结果表明,当砂体之间的间隔为1/8～1/4的地震波在泥岩内传播的波长时,在最大频率等于地震波在单个砂体内传播的双程时间的倒数的频率范围内,频谱极大点出现的个数为3个以上,可以基于该特征来判断砂体之间的叠置方式。
The reservoir in Triassic sandstones in Tahe Oilfield consists of a se ries of thin layers of sand and shale.This paper analyzes the features of the s tatistics of reservoir thickness from drilling in the oilfield and presents resp ectively analytic expressions of amplitude spectra of primary pulse responses in time domain via thickness and layers number of sandstone.Also analyzed are the features of synthetic seismograms and their amplitude spectra corresponding to various thickness of sandstone and intervals between sandstones.The results sho w that more than three of extremes on the amplitude spectra will occur within a frequency which equals the reciprocal of echo time in a sandstone when the inter val between the two sandstones is of 1/8 to 1/4 wavelength in sandstone.Hence, the superposition mode can be determined based on this character.
The reservoir in Triassic sandstones in Tahe Oilfield consists of a se ries of thin layers of sand and shale.This paper analyzes the features of the s tatistics of reservoir thickness from drilling in the oilfield and presents resp ectively analytic expressions of amplitude spectra of primary pulse responses in time domain via thickness and layers number of sandstone.Also analyzed are the features of synthetic seismograms and their amplitude spectra corresponding to various thickness of sandstone and intervals between sandstones.The results sho w that more than three of extremes on the amplitude spectra will occur within a frequency which equals the reciprocal of echo time in a sandstone when the inter val between the two sandstones is of 1/8 to 1/4 wavelength in sandstone.Hence, the superposition mode can be determined based on this character.
引文
[1]奚先,姚姚,顾汉明.随机缝洞介质模型及其波场模拟[J].地球物理学进展,2005,20(2):365-369.
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[4]蔡成国,赵迎月,顾汉明.塔河油田三叠系储层地震正演模拟及应用研究[J].石油天然气学报,2008,30(3):92-95
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[9]凌云研究组.地震分辨率极限问题的研究[J].石油地球物理勘探,2004,39(4):435-442.
[10]姚姚,唐文榜.深层碳酸盐岩岩溶风化壳洞缝型油气藏可检测性的理论研究[J].石油地球物理勘探,2003,38(6):623-629.
[11]Karsli H,Dondurur D,Cifci G.Application of complex-traceanalysis to seismic data for random-noise suppression and tem-poral resolution improvement[J].Geophysics,2007,71(3):79-86.
[2]李宗杰,王胜泉.地震属性参数在塔河油田储层含油气性预测中的应用[J].石油物探,2004,43(5):453-457.
[3]赵迎月,顾汉明,蔡成国.塔河油田三叠系砂岩储层地震正演响应特征[J].天然气工业,2008,28(6):52-55.
[4]蔡成国,赵迎月,顾汉明.塔河油田三叠系储层地震正演模拟及应用研究[J].石油天然气学报,2008,30(3):92-95
[5]Sheriff R E.Limitations on resolution of seismic reflection andgeologic detail derivable from them[J].AAPG Memoir 26,1977(1):3-14.
[6]Widess M A.How thin is a thin bed?[J].Geophysics,1973,38(8):1176-1254.
[7]云美厚,丁伟.地震分辨力新认识[J].石油地球物理勘探,2005,40(5):131-136.
[8]云美厚,丁伟,杨凯.地震道空间分辨力研究[J].地球物理学进展,2005,20(1):741-746.
[9]凌云研究组.地震分辨率极限问题的研究[J].石油地球物理勘探,2004,39(4):435-442.
[10]姚姚,唐文榜.深层碳酸盐岩岩溶风化壳洞缝型油气藏可检测性的理论研究[J].石油地球物理勘探,2003,38(6):623-629.
[11]Karsli H,Dondurur D,Cifci G.Application of complex-traceanalysis to seismic data for random-noise suppression and tem-poral resolution improvement[J].Geophysics,2007,71(3):79-86.
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