Abstarct: Abstract Searching for crude oil and natural gas reserves with expensive seismic methods is common. On the other hand, surface methods are cheaper and faster and are available, which greatly improve the effectiveness of oil exploration. One of these methods is the surface investigation by atmosogeochemical method. The purpose of this method is to identify, record and analyze the residual amounts of hydrocarbons in soil gas samples. This study has been done on the prospective structures of North Dezful Sardasht. 52 gas-soil samples were taken from a depth of 0.5 meters below the surface of the earth with a sampling capsule and then the hydrocarbon compounds were analyzed by gas chromatography. Sampling stations were placed along four profiles with an approximate distance of 330 meters. The maximum concentration of methane (CH4), total alkanes (C2-C4) and total alkanes (C2-C4) identified in the measured samples are: 382.20 ppm, 6.85 ppm and 3.15 ppm, respectively. Also, the absence of non-hydrocarbon volatile compounds (H2-N2-CO2) in the samples prevented their use as secondary indicators of exploration in the studied area. The normalization of the raw concentrations of hydrocarbon compounds in separate subsets baxsed on the values of ethane to ethylene ratio (the intensity rate of migration of micro-seeps) significantly changes the range of hydrocarbon anomalies. The changes in the normalized concentration of methane and total alkanes (C2-C4) provided the possibility of identifying four abnormal areas, two of which indicate the presence of deep hydrocarbon sources and the other two areas numbered 1 and 4 respectively indicate the presence of The fault and origin are biogenic compounds. The effect of multiple tectonic faults and fractures can be traced baxsed on the C2H6/C2H4 ratio (migration intensity rate of microseeps), which usually appear as a sudden linear anomaly on the surface. The statistical analysis of the ratio of ethane to propane showed that in the anomalous area No. 2, the strongest hydrocarbon surface geochemical signals of the gas condensate type are dominant, which seems to have the best prospects for the exploration of hydrocarbon resources. In the anomalous areas No. 2 and 3 of the atmospheric-geochemical profile, they show a very close match with the longitudinal map of the ridges of the reservoir horizon of the Asmari Formation (baxsed on geophysical data) in the Sardasht structure. Of course, in anomalous area No. 3, due to the predominance of gaseous compounds during the high ratio of C2H6/C3H8 in this area, it is possible that the compounds are related to the deep accumulations of the Cretaceous period (Bangistan Group). This study shows that if the surface geochemical results are combined with the results of geophysical studies, valuable information about hydrocarbon resources can be obtained.