Low permeability is one of the typical characteristics of tight-oil sandstone reservoirs. The matrix permeability is generally less than 0.1 mD under the geological conditions. Tight sandstone reservoirs usually exhibit complex pore structure and complex logging response characteristics. It brings great challenge to logging interpretation. For the special geological characteristics and petrophysical characteristics of tight-oil sandstone reservoirs in Ordos basin, this paper proposed a comprehensive evaluation method based on the matching relation between the quality of source rock and the quality of storage space. At first, the quality of source rocks (total organic carbon), the quality of reservoir (sandbody structure index and heterogeneity index of oil saturation), and quality of engineering (brittleness index) of tight sandstone reservoir are quantitative calculated using the conventional logging data. Then, the sweet spots index (SSI) is established using these parameters. The sweet spots distribution of Chang 7 formation in X well area, Jiyuan oilfiled is determined by multi-well evaluation. The well testing data verified the validity and reliability of the sweet spots prediction method proposed in this paper. The method plays an important role in guiding optimization exploration and development for tight-oil sandstone reservoirs.


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