Research On Hydrocarbon Enrichment Regulation Of Paleogene Dainan Formation In Yongan District,Gaoyou Sag

Yong'an area is located in Jiangdu,Jiangsu Province.Due to the complex geological conditions in the area,it has greatly affected people's understanding of the structural characteristics of the area and the distribution of oil and gas reservoirs.With the continuous development of science and technology,it is particularly important to re-develop the law of oil and gas enrichment in Yong'an area,laying a good foundation for the stable production of the old oilfield in the next step.This paper mainly focuses on the complex geological structures and exploration problems in Yong'an area.Based on the earthquake?drilling?logging?log?analytical test geological data,the conditions of hydrocarbon accumulation in the Yongan area from the source rocks,reservoirs,sedimentary facies,cap rocks and traps are carried out.A detailed analysis,and typical oil and gas reservoir anatomy to determine the main control factors,while establishing a reservoir model,summed up the oil and gas enrichment law in Yongan area,and finally used the fine structure interpretation to predict favorable traps.Mainly achieved the following results:(1)The sediments in the study area are dominated by delta deposits;the reservoir sand body is relatively developed,and the reservoir properties of the second mumber of Dainan formation are better than the first member of Dainan formation;There are two main reservoir-caprock assemblages in the study area,namely,the reservoir-caprock assemblages with E2d11 mudstone as the caprock,E2d12 sandstone as the reservoir,and E2d11 mudstone as the caprock and E2d12 sandstone as the reservoir.(2)Through the anatomy of typical oil and gas reservoirs and the study of the accumulation period,it is clear that the combination of reservoir and reservoir is the basis of the main controlling factors of hydrocarbon accumulation.The lateral sealing of faults is the key factor of hydrocarbon accumulation,diabase.The development of the oil and gas reservoirs is destructive to a certain extent,and the oil and gas accumulation model of Yong'an area is established.(3)The law of hydrocarbon accumulation is summarized.Combined with the fine interpretation of the structure,4 favorable traps are determined as the next exploration.aims.