一种断层重力异常定量解释方法
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摘要
断层解释一直是地质构造解释中的重要内容,尤其是对断层产状的确定。本文给出了一种断层定量解释方法,该方法利用重力异常的水平导数与垂直导数估算断层各项参数,不需要更高阶导数参与计算。理论模型试验表明,该方法反演得到的参数与理论参数的误差较小,可应用于实际断层的解释,但不适用于垂直断层情况。将该方法用于四川实测重力异常的解释中获得了断层的几何及密度参数,与由地震资料确定的断层参数吻合较好。
Interpretation of fault is always an important content in geological formation study,especially ascertainments of fault attitude.In this paper,we propose a quantitative method to interpret fault,which uses the horizontal and vertical derivatives of gravity anomaly to calculate fault parameters instead of calculation of higher order derivatives.The proposed method is demonstrated on synthetic data,and the error between the inversion results and theoretical parameters is very small,so this method can be applied to interpret real fault,but not comfortable for the vertical fault.We applied this method to real gravity data in Sichuan Basin,and the inversion results are consistent with the fault parameters given by the seismic data.
Interpretation of fault is always an important content in geological formation study,especially ascertainments of fault attitude.In this paper,we propose a quantitative method to interpret fault,which uses the horizontal and vertical derivatives of gravity anomaly to calculate fault parameters instead of calculation of higher order derivatives.The proposed method is demonstrated on synthetic data,and the error between the inversion results and theoretical parameters is very small,so this method can be applied to interpret real fault,but not comfortable for the vertical fault.We applied this method to real gravity data in Sichuan Basin,and the inversion results are consistent with the fault parameters given by the seismic data.
引文
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[3]Stanley J M.Simplified gravity interpretation by gradi-ents the geologic contact.Geophysics,1977,42(6):1230～1235
[4]Butler D K.Generalized gravity gradient analysis for2Dinversion.Geophysics,1995,60(4):1018～1028
[5]魏伟,刘天佑.台阶重力异常的梯度解释.石油地球物理勘探,2005,40(2):238～242Wei Wei,Liu Tianyou.Gradient interpretation of stepgravity anomaly.OGP,2005,40(2):238～242
[6]郭正吾,邓康龄,韩永辉等.四川盆地形成与演化.北京:地质出版社,1996
[7]穆石敏,申宁华,孙运生.区域地球物理数据处理方法及其应用.吉林长春:吉林科学技术出版社,1990
[2]Green R.Accurate determination of the dip angle of ageological contact using the gravity method.GeophysPros,1976,24(2):265～272
[3]Stanley J M.Simplified gravity interpretation by gradi-ents the geologic contact.Geophysics,1977,42(6):1230～1235
[4]Butler D K.Generalized gravity gradient analysis for2Dinversion.Geophysics,1995,60(4):1018～1028
[5]魏伟,刘天佑.台阶重力异常的梯度解释.石油地球物理勘探,2005,40(2):238～242Wei Wei,Liu Tianyou.Gradient interpretation of stepgravity anomaly.OGP,2005,40(2):238～242
[6]郭正吾,邓康龄,韩永辉等.四川盆地形成与演化.北京:地质出版社,1996
[7]穆石敏,申宁华,孙运生.区域地球物理数据处理方法及其应用.吉林长春:吉林科学技术出版社,1990
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