Study On Reservoir Enrichment Regularity Of Zhenyuan Oil Region

Zhenyuan area is located in the southwest of the Ordos Basin Zhenbei area,and it is an oil and gas enrichment area with multiple zones which obtained the industrial oil flow at Yan 8, Yan 9, Yan 10, Chang 3,Chang 4+5,Chang 8.Accorading to the situation of exploration and development in recent years,Chang 3 reservoir has great potential, the distribution of oil reservoir is scattered, the output of oil well is high, and the output of single well is high. But the degree of prospecting in Zhenbei area is low, with the continuous expansion of the scale of production,the contradiction between reserve resource shortage and the rapid development of ZhenYuan oil field is Increasingly prominent. This article in view of the above contradiction, and this study analyzes the ancient landform characteristics, clear up the sediment types and their characteristics, establish the distribution of sedimentary microfacies, reservoir characteristics,the enrichment regularity of oil reservoir and so on.Finaly, establish the classification criteria of reservoir and then screen favorable areas of Chang 3 reseivior.Combined with previous research results and starting from the main task of the problem, research, structure, sedimentary facies and reservoir layer, application of multi discipline theories,baced on the adjacent region contrast combined with modern testing techniques, study on the sedimentary facies, reservoir and reservoir controlling factors, further reveals the law of hydrocarbon accumulation, the establishment of the oil and gas accumulation mode, and to determine the optimal target for further exploration of Zhenbei area.The results show that the Chang 3 reservoir in Zhenbei area belongs to the delta depositional environment, including delta plain and the diversion channel is the most favorable sedimentary microfacies.On the plane of the sand body was trending northeast to southwest.Oil and gas migration channel in Zhenbei area is the combination of fracture, fracture permeability sandstone and cheese root network. Oil and gas migration is dominated by vertical migration, and oil and gas reservoir with multiple oil control, nose like structure into tibet, the migration accumulation model. By establishing the standard for classification of the Chang 3 reservoir,select three I type favorable construction regions,seven II type favorable construction regions and one III type favorable construction regions.