连续电磁剖面法在赛什腾山前逆掩推覆构造识别中的应用
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摘要
柴达木盆地北缘赛什腾山前带逆掩推覆构造发育,地表条件差,地震勘探困难,为此在该区开展了连续电磁剖面法勘探研究。采用Robust、远参考、静态校正多种预处理方法有效压制了干扰,提高了数据品质。通过综合应用Bostick、CMI和二维连续介质反演方法突出了有效异常,清晰地揭示了赛什腾山前带逆掩推覆构造的发育特征,明确了山前逆掩推覆断裂下盘地层空间展布及该区的盆山接触关系。
In the piedmont zone of the Saishiteng Mountain on the northern margin of Qaidam Basin,the thrust-nappe structure is developed,the surface condition is poor and hence the seismic prospecting is difficult.As CEMP method is hardly affected by the shielding effect of overthrust nappe structure and the effect of surface condition,the authors conducted researches on CEMP exploration in this area.In this paper,several methods such as Robust,remote reference technique and static correction were adopted in data preprocessing to suppress noise and improve data quality.Through the comprehensive utilization of Bostick,CMI and 2D continuous medium inversion,the effective anomaly was detected obviously,the structural characteristics of overthrust nappe was unveiled clearly,and the spatial spread of lower wall strata around the thrust-nappe fault and the contact relation between the mountain and the basin were determined in this area.
In the piedmont zone of the Saishiteng Mountain on the northern margin of Qaidam Basin,the thrust-nappe structure is developed,the surface condition is poor and hence the seismic prospecting is difficult.As CEMP method is hardly affected by the shielding effect of overthrust nappe structure and the effect of surface condition,the authors conducted researches on CEMP exploration in this area.In this paper,several methods such as Robust,remote reference technique and static correction were adopted in data preprocessing to suppress noise and improve data quality.Through the comprehensive utilization of Bostick,CMI and 2D continuous medium inversion,the effective anomaly was detected obviously,the structural characteristics of overthrust nappe was unveiled clearly,and the spatial spread of lower wall strata around the thrust-nappe fault and the contact relation between the mountain and the basin were determined in this area.
引文
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[2]张全胜,杨生,刘沈衡.连续电磁剖面法在石油勘探中的应用[J].资源调查与环境,2002,23(3).
[3]孙卫斌,张长江,员智能.连续电磁剖面法在古潜山构造勘探中的应用[J].地震地质,2001,23(2).
[4]李金铭.地电场与电法勘探[M].北京:地质出版社,2005.
[5]严良俊,胡文宝,杨绍方,等.电磁勘探方法及其在南方碳酸盐岩地区的应用[J].北京:石油工业出版社,2001.
[6]陈高,金祖发,马永生,等.大地电磁测深远参考技术及应用效果[J].石油物探,2001,40(3).
[7]杨生,鲍光淑,张全胜.远参考大地电磁测深法应用研究[J].物探与化探,2002,26(1).
[8]孙卫斌,罗卫峰,宋群会.复杂地区电磁法勘探远参采集系统的应用[J].物探装备,2002,12(4).
[9]刘天佑.应用地球物理数据采集与处理[M].武汉:中国地质大学出版社,2004.
[10]赵理芳,吴健生.大地电磁法数据的采集及质量分析[J].矿产与地质,2004,18(4).
[11]王家映.关于大地电磁的静校正问题[J].地质科技情报,1992,11(1).
[12]阎述,陈明生.频率域电磁测深的静态偏移及校正方法[J].石油地球物理勘探,1996,31(2).
[13]陈清礼,胡文宝,李金铭,等.利用地表电阻率校正大地电磁静态偏移[J].物探与化探,1999,23(4).
[14]宋守根,汤井田,何继善.小波分析与电磁测深中静态效应的识别分离及压制[J].地球物理学报,1995,38(1).
[15]戴世坤,李丽.复杂地形和地表条件下EMAP资料处理[C]//中国地球物理学会第十五届年会论文集,1999.
[16]王怀坤,雷宛,罗有春,等.电磁阵列剖面资料的高密度处理与比较[J].石油天然气学报,2009,31(1).
[17]王桂宏,马达德,张启全,等.柴达木盆地北缘盆山构造关系与油气勘探方向[J].石油勘探与开发,2008,35(6).
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