The oil asphaltene has structural similarity with parent kerogen. The kinetic data based on actual data from the reservoir oil is found to be a better method in reducing the risks associated with oil exploration and assessing the petroleum generation characteristics. An attempt has been made to assess the petroleum expulsion temperature/timing for predicting the kitchen in South Cambay Basin using oil asphaltene kinetics. The Gandhar field covers an area of about 800 km2 and is located on the rising northwestern flank of the Broach depression in the Jambusar-Broach
block. The Olpad Formation was deposited during the Paleocene. The Eocene Cambay Shale, unconformably overlying the Olpad Formation, has excellent source rock characteristics. The Hazad Member of south Cambay Basin is a major hydrocarbon reservoir, and it consists of 12-individual sand units from GS-XII-GS-I.