为了增强南泥湾油田汾川区块长6油藏后续勘探开发工作的科学性和实效性，综合应用岩心观察、铸体薄片鉴定、扫描电镜等分析测试资料，系统性地研究了汾川区块长6油层组的储层特征，采用petrel软件和tNavigator软件进行三维地质建模和油藏数值模拟，开展剩余油分布研究。结果表明：储层岩石类型主要为长石砂岩及少量岩屑长石砂岩；孔隙类型主要为残余粒间孔、溶蚀孔和少量裂缝孔；孔隙度主要分布于4% ~ 9%，渗透率主要分布在0.3×10^-3 μm²以下，属低孔、特低孔、特低渗储层。剩余油分布受砂体边界、物性差异及注采井网等的影响，主要分布于砂体边界处或砂体叠置部位，长小层剩余油分布较长连片性好。今后油田开发中可通过加密井部署、注水开发或“大斜度井+水平井”立体井网二次开发，充分动用剩余油，从而提高采收率。

To enhance the science and effectiveness of the subsequent exploration and development efforts targeting the Chang 6 oil reservoir in the Fenchuan block of Nanniwan oilfield. Core observation, cast thin section identification, scanning electron microscope and other analytical test data were applied to carry out reservoir characterization of the Chang 6 oil formation group in Fenchuan block. Petrel and tNavigator were used to perform 3D geological modeling and numerical simulation of the oil reservoir, and the residual oil distribution study was conducted. The results show that the reservoir's rock type is predominantly feldspathic sandstone, with a minor amount of debris-arkosic sandstone. The pore type is mainly residual intergranular pores and dissolution pores, as well as a small amount of fracture pores. The porosity is mainly distributed between 4% and 9%, and the permeability is mainly distributed below 0.3 × 10^-3 μm², which belongs to low porosity, extra low porosity and extra low permeability reservoirs. The distribution of residual oil is influenced by the sand body boundary, physical property differences, and the injection and production well network. It is primarily located at the boundary of the sand body or the overlapping part of the sand body. The residual oil distribution in the Chang layer is found to be better than that of the Chang layer in terms of contiguity. In future development, residual oil can be effectively utilized through encrypted well deployment, water injection, or secondary development using a three-dimensional well network of "high-angle wells + horizontal wells," thereby improving recovery rates.