陆9井区近地表结构及静校正方法
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摘要
地表及近地表结构的纵横向变化是产生不同波长静校正问题的重要因素之一。陆9井区地表为沙漠所覆盖,地形起伏较大,具有典型的风成沉积特征;未胶结的沙丘之下是早期出露于地表的古湖底,分布着胶结或半胶结的砂泥岩互层,具有水成特征。以往该区采用传统的表层结构调查方法,无法获取准确的地表及近地表结构深度、速度参数,以致地震数据存在严重的长波长静校正问题。据此,就陆9井区地震数据不同静校正处理的方法进行分析、对比,其结果表明,表层模型层析反演静校正技术不仅可以用于静校正数据的求取,而且可以建立近地表深度-速度模型,以便连续观测测线下高速层顶界以上介质的纵横向速度变化,为表层结构研究提供依据。
The vertical and lateral variation of surface or near-surface structures is one of important factors of causing different wave lengths static correction problem.The surface of Lu-9 well area in Junggar basin is covered by desert and characterized by varied reliefs and typical aeolian sediments.Under the uncemented dune is the early exposed ancient lakebed where cemented or semi-cemented sand-shale interbed is distributed and characterized by aqueous origin.In the past the traditional surface structure investigation method could not be used to get accurate depth and velocity parameters of the surface and/or near-surface structures,resulting in that the long wavelength static correction should be made for the seismic data available.This paper presents the method for such correction of seismic data from this well area.The analysis,comparison and result show that such a correction can not only be used to obtain the data as required,but also develop the model for near-surface depth vs.velocity,so as to continuously determine the vertical and lateral velocity variations of strata above the top of high velocity layers and provide basis for the near-surface structural researches.
The vertical and lateral variation of surface or near-surface structures is one of important factors of causing different wave lengths static correction problem.The surface of Lu-9 well area in Junggar basin is covered by desert and characterized by varied reliefs and typical aeolian sediments.Under the uncemented dune is the early exposed ancient lakebed where cemented or semi-cemented sand-shale interbed is distributed and characterized by aqueous origin.In the past the traditional surface structure investigation method could not be used to get accurate depth and velocity parameters of the surface and/or near-surface structures,resulting in that the long wavelength static correction should be made for the seismic data available.This paper presents the method for such correction of seismic data from this well area.The analysis,comparison and result show that such a correction can not only be used to obtain the data as required,but also develop the model for near-surface depth vs.velocity,so as to continuously determine the vertical and lateral velocity variations of strata above the top of high velocity layers and provide basis for the near-surface structural researches.
引文
[1]赵峰,陈志刚.准噶尔盆地表层结构基本类型及特征[J].新疆地质,2004,22(2):191-194.
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[4]Cox M.Static corrections for seismic reflection surveys[M].Society of Exploration Geophysicists,Tulsa,Oklahoma,1999.
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[2]狄桂生,石星.对地震资料处理中几个问题的看法[J].新疆石油地质,2003,24(4):306-307.
[3]赵峰,郑鸿明.层析反演静校正技术及应用效果分析[J].新疆石油地质,2002,23(5):397-399.
[4]Cox M.Static corrections for seismic reflection surveys[M].Society of Exploration Geophysicists,Tulsa,Oklahoma,1999.
[5]姚姚,詹正彬.地震勘探新技术与新方法[M].武汉:中国地质大学出版社,1991:122+124.
[6]渥.伊尔马兹.地震资料分析[M].北京:石油工业出版社,2002.
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