Geochemistry and Origin of Oil and Natural Gas in Baimiao Area of Dongpu Depression

Key words: 
• gas /
• condensate oil /
• geochemistry characteristic /
• Dongpu depression

Abstract: Baimiao structure in the south of Dongpu depression is a trap with rich natural gas and condensate. The reservoir has some characters of many source rocks and many periods of formation and interruption. Based on the study of primarily geolegical characters, this paper investigates the variation law of carbon isotope of methane in natural gas and density of condensate as well as the character of biomarkers in condensate, which helps discussion on origin of oil and gas and their migration direction and time to the whole reservoir, together with applying of more geochemical methods in authigenic minerals.