Characteristics Of Source Rocks And Oil Source Analysis In Yanchang Group Of Wuqi-Zhidan Area In Ordos Basin

In this paper,through the collection of the studies of the source rocks and crude oil geochemical analysis data,and sample test,Erdos basin of Triassic Yanchang Formation of Zhidan area in Wuqi-under the combination of the three sets of hydrocarbon source rocks was evaluated,Combined with the analysis of the physical and chemical properties of crude oil,the crude oil is divided into two categories.Effective contrast parameters are selected for oil source correlation,and oil and oil cluster analysis method is used.and the analysis of clear oil sources of the combination of Yanchang group,according to the typical blocks reservoir,clear the main controlling factors of hydrocarbon accumulation in the study area,the establishment of oil and gas migration and accumulation mode.Under the combination of group has developed three sets of hydrocarbon source rocks to extend the research area,through the comprehensive evaluation,7 source rock thickness,wide distribution,the average thickness of 13.8m,the type of organic matter is dominated by I~II1,the evolution of organic matter has a high degree of maturity of oil and gas phase hydrocarbon generating ability,belongs to good source rocks.However,the thickness of source rocks of Chang 8 and Chang 9 is relatively small,the distribution range is relatively limited,the organic matter abundance is slightly low,the organic matter type is mainly II1 and II2 type,the maturity is moderate,it is in the mature stage of massive oil generation,and it is also a good source rock on the whole.But compared with the chang 8 and the chang 9,the thickness and distribution of the chang 9 hydrocarbon source rocks are better than the chang 8.Comparison and analysis of oil source and oil and oil by comparison of oil source and oil and oil,combined with the analysis of the geological condition,the oil source,the results show that the combination of Yanchang group,West Chang 8,Chang 9,Chang 10 oil mainly from Chang 7 source rocks;middle chang 8,chang 9,chang 10 crude oil mainly from chang 7 hydrocarbon the source rocks,with a chang 9 hydrocarbon source rocks;the Eastern chang 8,chang 9,chang 10 crude oil mainly from Chang 9 source rocks.According to the typical reservoir in study area were dissected and the research results,the study area of reservoir plane distribution of hydrocarbon source rocks in the control center,Sedimentary facies belt control oil and gas enrichment,the reservoir is generally low porosity and low permeability reservoir control oil and gas enrichment.What part of the study area has the difference of accumulation phenomenon: Western Wuqi area by chang 7 source rock hydrocarbon migration downward cross layer into chang 8 chang 9 chang 10 reservoir;Eastern Zhidan area Chang 9 source rocks upward and downward expulsion into the chang8 ?chang9?chang10 reservoir.