Structural analysis is the way to have a better understanding of structural geology in oil and gas fields. By using the image log technology, we can do this analysis very well, but this process is complicated and it is still unknown to many researchers. Therefore, we decided to explain this process by using a unique case study and a number of valuableimage log interpretation examples. This jobwill be done in Gachsaran field, one of the most important Iranian fields, and the main reservoir that will be studied is Asmari reservoir, one of the most important Iranian oil and gas reservoirs. We aim to offer a unique educational paper that will be very useful for the other researchers who are interested in structural geology and image log technology. This job showed that the direction of bedding strike is almost NW-SE direction for theAsmari reservoir in the section of Gachsaran field.