从层间非均质性、层内非均质性和平面非均质性3方面对鄂尔多斯合水地区长8油层组非均质性进行了研究。研究区长81油层组和长82油层组砂体频率和砂体密度相近,层间渗透率非均质性较弱,层间隔层厚度变化较大,整体上长8油层组层间非均质性较弱;研究区长81、长82夹层发育,存在多段高渗层,层内渗透率的变异系数、突进系数和级差都较大,两油层段的层内非均质性均较强;研究区长81、长82流动单元分布受沉积微相的影响明显,差、中流动单元分布较多,好流动单元分布较少。 Heterogeneity of the Chang 8 reservoir in the Ordos Heishui area has been studied from three aspects: interlayer heterogeneity, intra-layer heterogeneity and planar heterogeneity. The sand body frequency and sandbody density of the No.81 reservoir group and the Chang82 oil reservoir group in the study area are similar, the inter-layer permeability heterogeneity is weak, and the thickness of the inter-layer interval layer varies greatly. As a whole, inter-layer heterogeneity The study area has a long history of 81 and 82 growth stages. There are multi-layers of high permeability layers with large variation coefficient of in-depth permeability and coefficient of variation. The intra-layer heterogeneity of the two layers is strong. The distribution of the Chang 81 and Chang 82 flow units is obviously affected by the sedimentary microfacies, while the distribution of the flow units in the poor and medium is more and the distribution of the good flow units is less.