利用地震振幅预测三工河组底部砂体相对厚度初探
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摘要
当大套泥岩中所夹砂岩的总厚度小于地震波主波长的时，地震反射振幅将随砂岩总厚度的增大而增强。根据振幅和砂岩厚度的这一关系，在研究准葛尔盆地东部彩南地区侏罗系三工河组底部砂体的厚度变化和展布趋势时，取得了有意义的成果。本文主要介绍了这一探讨性方法的应用过程、效果和存在问题，并结合前积、侵蚀谷等直接地震相标志和钻井、露头资料，对彩南地区三工河组沉积相作了分析。
When the total thickness of a sandstone interbedded by a vast amount of mudstone is less than a quarter of the dominant wavelength, the reflection amplitude will increase with the increasing sandstone's thickness. Based on the amplitude dependence of sandstone's thickness, a survey to investigate the thickness variation and distribution trend for the sand body at the bottom of Jurassie Sangonghe Formation in Cainan Area of castern Zhunger basin has completed with good results achieved. This paper will present the application procedures, the results achicvcd and the existing probleru of the method. An analysis is also made for the sedimentary facies of Sangonghe Formation in Cainan Area,in which integrated data ftom direct scismic facies indications including the progradation and eroded valley as well as the data ftom boreholes and outcrops are used.
When the total thickness of a sandstone interbedded by a vast amount of mudstone is less than a quarter of the dominant wavelength, the reflection amplitude will increase with the increasing sandstone's thickness. Based on the amplitude dependence of sandstone's thickness, a survey to investigate the thickness variation and distribution trend for the sand body at the bottom of Jurassie Sangonghe Formation in Cainan Area of castern Zhunger basin has completed with good results achieved. This paper will present the application procedures, the results achicvcd and the existing probleru of the method. An analysis is also made for the sedimentary facies of Sangonghe Formation in Cainan Area,in which integrated data ftom direct scismic facies indications including the progradation and eroded valley as well as the data ftom boreholes and outcrops are used.
引文
[1] Widess,M. B.,How thin is a thin bed,Geophysies,Vol. 38,P1176～l180, l973
[2] Neidell, N. S.. and E. Poggiagliolm, Stratigraphic modeling and interpretatiQn, AAPGMemoir 26,P 417～ 438. 1 977.
[3] Kallweit, R. S. and L. C. Wood, The limits of resolution of zero-phase wavelets,Geophysics,Vol. 47,P 1035～ 1046, 1982.
[4] Mahradi, Physical modeling studies of thin beds, University of Houston, MaSter's thesis,1009, 1983.
[5] Sheriff,R. E.,A few seismic resolutions,AAPG Memoir 39,P1 ～ 11. 1985.
[2] Neidell, N. S.. and E. Poggiagliolm, Stratigraphic modeling and interpretatiQn, AAPGMemoir 26,P 417～ 438. 1 977.
[3] Kallweit, R. S. and L. C. Wood, The limits of resolution of zero-phase wavelets,Geophysics,Vol. 47,P 1035～ 1046, 1982.
[4] Mahradi, Physical modeling studies of thin beds, University of Houston, MaSter's thesis,1009, 1983.
[5] Sheriff,R. E.,A few seismic resolutions,AAPG Memoir 39,P1 ～ 11. 1985.
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