| With the exploration extent of petroliferous basins deepening and exploration technology becoming more riped.It’s essential for oil-enriched Depressions to find the remaining resources.Baxian and Raoyang Depression have high quality source rocks,belonging to oil-enriched Depression.Deepening the research about source rocks can make a more scientific valuation of remaining petroleum resources.Based on the theory of petroleum geology,logging,well logging,seismic means and geochemical data,this thesis have studied in the development characteristics of source rocks and origin of oil and gas from the three aspects of the evaluation,distribution of source rocks and relationship between source rocks and oil.Through the evaluation of source rocks,the main source rocks are Member 4 in Shahejie Formation,middle and low of Member 3 in Shahejie Formation and low of Member 1 in Shahejie Formation in Baxian Depression and upper of Member 3 in Shahejie Formation and low of Member 1 of Shahejie Formation in Raoyang Depression.Comprehensively using method of ΔlogR and seismic means to identify source rocks,describing the thickness and distribution of source rocks,we can find that the number of source rocks is larger,the depositional age of source rocks is older and the thickness of source rocks is bigger than Raoyang Depression.Through the analysis for biomarker characteristics of source rocks in different intervals and Sags,combined with the analysis for the biomarker characteristics of crude oil to establish the correlation between source rocks and oil,we make a conclusion that high-quality source rocks almost control the distribution of oil and gas in the oil-enriched Sag. |
