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根据砂地比值、隔层分布及厚度、孔隙度和渗透率参数等资料,对旦八油田延长组长4+5储层非均质性进行分析。结果表明:该区长4+5总体具有向上储层规模变小、非均质性变强的特点;隔层分布呈北东南西向,与沉积相带一致,表明主要受沉积环境影响;受沉积相的影响,长4+51和长4+52的储层差别较大,长4+51非均质性较强,属于典型的泥包砂,长4+52砂体厚度大,平面展布较广,储层物性好,非均质性相对较弱,是该区的主力油层。
The heterogeneity of 4 + 5 reservoirs in Yanchang Formation of Dan eight oilfield is analyzed according to the sand ratio, distribution and thickness of interlayer, porosity and permeability parameters. The results show that the 4 + 5 zone has the characteristics that the size of the upwelling reservoir is small and the heterogeneity is stronger. The distribution of the compartments is northeast, southwest and west, consistent with the sedimentary facies, indicating that the reservoir is mainly affected by the sedimentary environment. Facies, the reservoirs of Chang 4 + 51 and Chang 4 + 52 are greatly different, with 4 + 51 heterogeneity, which is typical of mudflat. The thickness of Chang 4 + 52 sand body is large and the plane is distributed Wider, reservoir properties, and relatively poor heterogeneity, is the main reservoir in the area.