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从层内非均质性、层间非均质性两方面对鄂尔多斯盆地胡尖山地区长9油层组各小层层内、层间非均质性特征进行探究,为油田勘探开发提供依据。通过岩心观察、测井解释结论等各种资料统计分析最终进行综合研究。胡尖山地区长9油层中长91作为主力层,夹层密度平均29%,夹层频率平均为0.09条/米,层内平均极差、变异系数、突进系数分别为7.74、0.365、1.41。层间平均极差、变异系数、突进系数分别7.16、1.55、0.43,隔层厚度达到8.31 m。结论得出,胡尖山地区长9油层组包括长91和长92的层内非均质性属于中等非均质型储层——非均质性较弱。长91作为主力层层内非均质性较长92强。整体上,长9油层组层间非均质性较弱,但其平面展布差异较大。
In-layer heterogeneity and inter-layer heterogeneity are used to explore the heterogeneity of inter-layer and inter-layer heterogeneity of Chang 9 reservoir in the Hujian Mountain area, Ordos Basin, so as to provide basis for oilfield exploration and development. Through the core observation, log interpretation and other data statistical analysis of the final comprehensive study. The length of 91 in the Chang 9 oil layer of Hujian Mountain is the main layer, with an average of 29% of interlayer density and an average of 0.09 strips / m of interlayer frequency. The intra-layer average range is very poor with coefficient of variation and coefficient of protrusion of 7.74, 0.355 and 1.41 respectively. The average difference between layers, coefficient of variation and coefficient of protrusion were 7.16, 1.55 and 0.43 respectively, and the thickness of the interlayer reached 8.31 m. As a result, it is concluded that the in-reservoir heterogeneity of the Chang-9 reservoir, including the Chang-91 reservoir and the Chang-92 reservoir, in the Hushan area belongs to the medium-heterogeneous reservoirs - with low heterogeneity. Long 91 as the main layer of heterogeneity longer 92. As a whole, the inter-layer heterogeneity of Chang 9 reservoir is weak, but the plane distribution is quite different.