As a typical rifted basin, Bonan sag has discovered all types of oil and gas accumulations that have been found in rifted basins, including conventional & intermediate & unconventional reservoirs that distributed from the margins to the center of the sag. Controlled by structural evolution, the petroleum geologic conditions include multi-stage tectonic movement, multi-set source rock, multistage generation and expulsion of hydrocarbons, multi-stage hydrocarbon migration and accumulation. The“five multi”are related to each other and determine the order of oil and gas distribution to form a unified whole of oil and gas distribution. The continuance of hydrocarbon distribution is characterized by the multi-layer of hydrocarbon accumulation in vertical and multi-type reservoirs distributed in horizontal. The control factors of the order of oil and gas distribution including the distribution and strike of tectonic unit, the condition of source rock, the origin and distribution of reservoir, the characteristic of cap rock and trap, the dynamic of petroleum migration and accumulation, which are organic integrated and related. In recent years, according to the understanding of the order and continuance of the distribution of hydrocarbon, the thought of stereoscopic exploration is used on the basis of conventional oil and gas exploration. Continuous oil and gas accumulations have been discovered represented by large-scale near-source tight reservoir and shale oil and gas, and exploration of conventional oil and gas also have made great progress.