Assam Basin has been extensively explored and is bestowed with some of the major oil producing fields in India. Most of the earlier discoveries within these fields were made on simpler sub-surface structures which mimicked similar entrapment (mainly structural) conditions at various stratigraphic levels. However, the easy days for exploration has faded away and nowadays, for ascertaining the sub-surface uncertainties, the focus has been laid on exploring smaller structures with strati-structural aspects using advanced and innovative G&G interpretational skills. Currently the focus of my research work is to highlight the main controlling factors of hydrocarbon accumulation, revealing hydrocarbon accumulation patterns and establishing hydrocarbon accumulation models, so as to provide theoretical guidance for further oil and gas exploration in Assam Basin in Eastern India.