Joint inversion of magnetotelluric and gravity data based on petrophysical property

摘要

The aim of joint inversion is to improve the reliability of inversion results and to reduce thernnon-uniqueness of inversion as the current research hotspot in geophysical field[1]. In the practical work,rnlateral resolution of MT method is weak while it’s vertical resolution is better. And the lateral resolution ofrnGravity method is better than MT’s. MT-Gravity joint inversion can improve the vertical resolution andrntransverse resolution at the same time [2]. In joint inversion field, the one on the basis of petrophysicalrnproperty between different physical methods to implement is one of the hot spot of research in the field.rnThe joint inversion of MT and Gravity based on petrophysical property is based on physical or empiricalrnrelationship between the premise of density and resistivity or conductivity. Chen Huagen[3] simulatedrnannealing algorithm of MT-Gravity inversion，completed the model of theory test and actual data processingrnwith favourable effect. In 2011, R. Maier[4] build up the relation between the conductivity and density for thernjoint inversion of MT and gravity by analyzing of the parameters such as porosity. Jegen[5] completed thernjoint inversion of MT and Gravity with the constraint of seismic information. Heincke[6] implemented thernjoint inversion of gravity, MT and seismic data with the relationship of experience between resistivity andrnspeed and density.We introduce the properties of resistivity and density to the synchronous joint inversion ofrnMT and gravity.