Magnetotelluric inversion for 2D anisotropic conductivity structures
نویسنده
چکیده
We report on progress in developing a magnetotelluric inversion method for two-dimensional anisotropic conductivity distribution. A standard two-dimensional model is discretized into a number of rectangular cells, each with a constant conductivity tensor, and the solution of the inverse problem is obtained by minimizing a global objective functional consisting of data misfit, a structural constraint and an anisotropy constraint. All minimizations are carried out by using the Gauss-Newton algorithm, and model perturbations at each iteration step are obtained by a conjugate gradient least squares method. The inversion algorithm is tested on synthetic data generated by two elementary models: a single prism and two prisms with anisotropy.
منابع مشابه
A resolution comparison of horizontal and vertical magnetic transfer functions
The main goal of the present study is to identify characteristics of the inter-station horizontal magnetic responses and the vertical magnetic data, as two types of magnetotelluric transfer functions, in the modeling procedure. Through consideration of model responses and two-dimensional inversion of synthetic data, sensitivity of the data components in detecting different geophysical structure...
متن کاملDimensionally adaptive hp-finite element simulation and inversion of 2D magnetotelluric measurements
Magnetotelluric (MT) problems often contain different subdomains where the conductivity of the media depends upon one, two, or three spatial variables. Traditionally, when a MT problem incorporates a three-dimensional (3D) subdomain, the numerical method employed for simulation and inversion was 3D over then entire domain. In here, we propose to take advantage of the possibly lower dimensionali...
متن کاملThree-dimensional Magnetotelluric Modeling of data from Northeast of Gorgan Plain
Magnetotelluric measurements have been conducted in the period range of 0.005-128 s along five parallel east-west directed profiles including 85 sites totally in the north-eastern part of Gorgan Plain, Golestan Province, North of Iran; with the aim of exploring iodine. Distortion and dimensionality analysis of data imply the existence of a north-south elongated two-dimensional model with some l...
متن کاملApplication of 2D inversion of magnetotelluric in exploration of hydrocarbon in south west of Iran
Since hydrocarbon sources have an important role in development of industry and technology, exploration of them has been lionized by human. The seismic reflection method is one of the most applicable investigative methods to identify the hydrocarbon reservoirs, but in some cases this method does not work well because of geology conditions and wave attenuation in depth. Thus, some exploration me...
متن کاملInversion of magnetotelluric data for 2D structure with sharp resistivity contrasts
We have developed a linearized algorithm to invert noisy 2-D magnetotelluric data for subsurface conductivity structures represented by smooth boundaries defining sharp resistivity contrasts. We solve for both a fixed number of subsurface resistivities and for the boundary locations between adjacent units. The boundary depths are forced to be discrete values defined by the mesh used in the forw...
متن کامل