山前砾岩区下伏构造速度建场及成图技术
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摘要
盆地周缘的山前冲断带圈闭的发现与落实受浅层砾石层影响严重,需要准确刻画巨厚、不等厚砾石层下伏构造。而直接利用地震速度建立速度场,变速成图时深转换的方法不能满足成图精度要求。针对巨厚、不等厚砾石层下伏构造的特点,总结多年山前复杂构造区速度建场及成图方法经验,运用适宜于巨厚、不等厚砾石层下伏构造速度建场及成图方法——砾石厚度雕刻成图法,消除巨厚砾岩影响,落实了独南构造,为下步独南构造的钻探提供了依据。
The discovery and ascertain of traps in piedmont thrust belt on the rim of Junngar Basin have been severely affected by shallow gravel bed, and it is necessary to accurately portray the structure underlying the thick gravel bed of unequal thickness. However, the method of variable velocity mapping and time-depth conversion, which directly use seismic velocity to build velocity field, can not satisfy the accuracy requirement for mapping. This paper describes the structure underlying the thick gravel bed of unequal thickness, generalizes the experiences of many years in velocity-field-built and mapping for complex piedmont structures, and uses a suitable method—gravel thickness sculpture mapping—for velocity-field-built and mapping of the underlying structure. Therefore, the impact of thick gravel bed has been eliminated, and the Dunan structure has been identified, thus provided basis for drilling in Dunan structure.
The discovery and ascertain of traps in piedmont thrust belt on the rim of Junngar Basin have been severely affected by shallow gravel bed, and it is necessary to accurately portray the structure underlying the thick gravel bed of unequal thickness. However, the method of variable velocity mapping and time-depth conversion, which directly use seismic velocity to build velocity field, can not satisfy the accuracy requirement for mapping. This paper describes the structure underlying the thick gravel bed of unequal thickness, generalizes the experiences of many years in velocity-field-built and mapping for complex piedmont structures, and uses a suitable method—gravel thickness sculpture mapping—for velocity-field-built and mapping of the underlying structure. Therefore, the impact of thick gravel bed has been eliminated, and the Dunan structure has been identified, thus provided basis for drilling in Dunan structure.
引文
[1]李向科.加拿大阿萨巴斯卡焦油砂岩加热区带的地震速度模型[J].特种油气藏,2002,9(5):101-104.
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[4]冯许魁,任尚斌.复杂高陡构造区变速成图技术[J].石油地球物理勘探,2002,37(专刊):172-175.
[5]冯全雄,黄兆林,葛勇.模型研究指导层速度解释方法探索及应用[J].中国海上油气,2005,17(3):74-79.
[6]邵雨,李学义,孔智勇,等.模型速度建场方法的应用研究[J].石油地球物理勘探,2003,38(6):673-679.
[7]马海珍,雍学善,杨午阳,等.地震速度场建立与变速构造成图的一种方法[J].石油地球物理勘探,2002,37(1):53-59.
[8]王世瑞,李绪勇.速度场建场方法研究及在吐哈盆地的应用[J].石油地球物理勘探,1997,32(增刊1):86-94.
[2]漆立新,顾汉明.天山南缘亚肯北地区速度建场因素分析[J].石油地球物理勘探,2007,42(4):407-412.
[3]吕焕通,郑鸿明,等.RG线的认识及时深转换的基准面问题[J].石油地球物理勘探,2003,38(1):33-37.
[4]冯许魁,任尚斌.复杂高陡构造区变速成图技术[J].石油地球物理勘探,2002,37(专刊):172-175.
[5]冯全雄,黄兆林,葛勇.模型研究指导层速度解释方法探索及应用[J].中国海上油气,2005,17(3):74-79.
[6]邵雨,李学义,孔智勇,等.模型速度建场方法的应用研究[J].石油地球物理勘探,2003,38(6):673-679.
[7]马海珍,雍学善,杨午阳,等.地震速度场建立与变速构造成图的一种方法[J].石油地球物理勘探,2002,37(1):53-59.
[8]王世瑞,李绪勇.速度场建场方法研究及在吐哈盆地的应用[J].石油地球物理勘探,1997,32(增刊1):86-94.
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