Abstarct: Magnetotelluric (MT) method is one of the electromagnetic (EM) methods with natural source that are used for exploration subsurface structures. In the last decade, electromagnetic methods and MT specially have become more widely used in hydrocarbon exploration. It has been used in overthrust zones, in area with rough topography and in sub-sult imaging that the seismic data have poor quality. Magnetotelluric exploration was applied in korand area, at Northeast of Iran in 2008. The aim of this research are modeling and interpretation of magnetotelluric data to detect the hydrocarbon structures and determining the lateral extension and top of Tirgan formation constitute the main reservoir rocks of this area. Then the resistivity model of magnetotelluric data is evaluated with well-log data and a seismic time section. Also static shifts in the MT data were removed using Transient Electromagnetic (TEM) data before MT data inversion. The one and two-dimensional inversion models imaged the laxyerd and folding structure for Eastern Profiles and smooth structure without significant folding for Western Profiles. The results of 2-D inversion model, geology information, seismic data and resistivity log were determined the roof of resistive laxyer which is the top of Tirgan formation that is located at the depth of 5700 meter near the P2 profile and lateral extension of this formation in Eastern Profiles is more than the Western Profiles. Also with studying of depth map, the affect of Marveh Tapeh fault in the South of the Profiles and the other fault in the North and Northeast of the Profiles was significant.