关键词: 物理模拟, 岩性油气藏, 含油饱和度, 充注方式, 陆相断陷盆地

Abstract:

Chang 8 member of Yanchang Formation is the major reservoir in Jiyuan Oilfield. With the development of oil and gas exploration, the areal heterogeneity of the reservoir has become an obstacle for further exploration and development, so the fine sedimentary facies description is particularly significant. Based on the analysis of sediment provenance and facies indicator, it is considered that Chang 8 member ofYanchang Formation is controlled by the provenances fromthe northwest and northeast, experienced the transformation from delta plain to delta front, and deposited distributary channel sand body which is superimposed vertically and continuous laterally. The physical properties of Chang 81 layer under different subfacies and different sources are contrasted. The result shows that the reservoir property of delta plain in Chang 81 layer is better than that of delta front, and the reservoir property controlled by the provenance fromnorthwest is better than that controlled by the provenance from the northeast. The favorable reservoirs of Chang 8 member are predicted, and it is considered that the reservoir in the northwest of Jiyuan Oilfield has great hydrocarbon potential.

Key words: physical simulation, lithologic reservoirs, oil saturation, charging patterns, continental rifted basin