Research And Application Of Higher Derivative In Gravity Anomaly

Gravity exploration as a traditional geophysical method,with the rapid development of computer technology and improve the precision of the instrument,are widely used in various fields.By gravity we can get the designated area of the gravity anomaly,we expect the gravity anomaly for the underground geological occurrence,shape,key parameters position.But because of the gravity anomaly is the superposition of the underground geological anomaly,is often interfered by various factors,make it difficult to get useful information.So how the gravity anomaly of the processing and interpretation of science is the key.The high order derivative of gravity exploration is an effective method of determining subsurface geology the boundary of the body.The higher order derivative is a kind of filter in essence,which can highlight the gravity anomaly of the shallow and small geological body,and restrain the influence of the geological factors of deep buried depth.Can also be divided into several buried depth is not close to each other caused by the geological anomaly of gravity anomaly.In order to verify and the effect of higher order derivatives,firstly,based on the basic theory of the gravity field,derived gravity anomalies and the derivative calculation formula,the calculation formula of the higher order derivative of conversion.And the preparation of the relevant Frotran program.Secondly,two kinds of models are designed.Two higher order derivative methods are used to calculate the vertical derivative of the two order,and we can prove that the boundary of the model and the approximate projection on the ground can be determined by the intersection of the vertical derivative curves of the two different radii of the two different radii.The method for processing the actual gravimetric data,obtained.Good application results verify the practicability and effectiveness of the method.