Oil-source correlation is performed in Chang-10 interval of the Yanchang Fm through comparative analysis of the geochemical characteristics of Chang-10 crude oil

Chang-7 and Chang 9 source rocks

as well as difference analysis of fluid inclusions homogenization temperature distribution between Chang-10 reservoir and other reservoirs with hydrocarbons from Chang 7 source rocks.Moreover

the factors controlling hydrocarbon pooling in Chang-10 are also identified based on sedimentary and reservoir characteristics.The result shows that the Chang-9 is the major source rocks for the Chang-10 oil reservoir

to which the Chang-7 also contributed limited hydrocarbons.The formation of the Chang-10 oil reservoir was controlled by various factors such as quality

deposition

diagenesis and micro-structure of source rocks.The distribution of the Chang-10 oil reservoir was controlled by the distribution and development of the Chang-9 source rocks.Favorable sedimentary facies belts

diagenetic facies zones and high overpressure zones of the Chang-9 dark mudstone are the favorable target areas for discovering oil reservoirs.The Chang-10 oil reservoir is controlled by both structure and lithology.Three main reservoir types are identified

including structural-lithological reservoir

up-dip pinch-out sandstone reservoir and up-dip tight layer sealing reservoir.