低幅度构造成图技术
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摘要
在总结塔里木盆地库车坳陷托乎拉—三道桥地区低幅构造研究成果的基础上,提出了一套适于深层低幅度构造成图的技术和方法,利用这项技术和方法能够提高低幅度构造成图的精度,落实局部构造,降低勘探风险,对于类似地区的低幅度构造研究,具有借鉴意义。
The study results of low-amplitude structure i n Tuohula-Sandaoqiao area of Kuche depression in Tarim basin are summarized,base d on which this paper presents the technique for mapping deep low-amplitude str uctures.The technique can be used to improve the mapping accuracy of low-ampli tude structures,verify local structures,reduce risk for exploration.The key o f the mapping technique is in un-derstanding of seismic velocity,in which the main procedures are described as following:1)calculation of interval velocity from Dix formula and obtaining the average velocity by using the stack velocity ;2)calculation of pseudo average velocity from drilling geologic zonation dat a and seismic interpreted interval as well as its transversal variation gradient ;3)analysis and correlation of the average velocity and variation(i.e.velo city and gradient matching);4)averaging the difference between steps2)and 3),and making correction by Kriging interpolation tech-nique;5)correlatio n of t 0 interpretation and average velocity change;6)consideration and remove of 3D boundary effect,and7)making time-depth conversion.
The study results of low-amplitude structure i n Tuohula-Sandaoqiao area of Kuche depression in Tarim basin are summarized,base d on which this paper presents the technique for mapping deep low-amplitude str uctures.The technique can be used to improve the mapping accuracy of low-ampli tude structures,verify local structures,reduce risk for exploration.The key o f the mapping technique is in un-derstanding of seismic velocity,in which the main procedures are described as following:1)calculation of interval velocity from Dix formula and obtaining the average velocity by using the stack velocity ;2)calculation of pseudo average velocity from drilling geologic zonation dat a and seismic interpreted interval as well as its transversal variation gradient ;3)analysis and correlation of the average velocity and variation(i.e.velo city and gradient matching);4)averaging the difference between steps2)and 3),and making correction by Kriging interpolation tech-nique;5)correlatio n of t 0 interpretation and average velocity change;6)consideration and remove of 3D boundary effect,and7)making time-depth conversion.
引文
[1]谢里夫RE.勘探地震学[M].北京:石油工业出版社,1999.
[2]章家骥.关于提高层速度精度的问题[A].石油物探文集第一辑[C].湖北:武汉地质学院出版社,1987.130.
[3]欧阳健.石油测井解释与储层描述[M].北京:石油工业出版社,1994.
[4]何樵登.地震勘探原理与方法[M].北京:地质出版社,1980.
[2]章家骥.关于提高层速度精度的问题[A].石油物探文集第一辑[C].湖北:武汉地质学院出版社,1987.130.
[3]欧阳健.石油测井解释与储层描述[M].北京:石油工业出版社,1994.
[4]何樵登.地震勘探原理与方法[M].北京:地质出版社,1980.
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