中文摘要：

应用地震、测井、录井和分析化验资料，研究新疆哈密地区三塘湖盆地二叠系致密油地质特征及勘探潜力。三塘湖盆地二叠系条湖组二段发育高孔低渗型致密沉凝灰岩储集层，储集层粒度细，纳米级孔喉占88．3％，空气渗透率小于0．5×10^-3μm^2；储集层脆性大、易于压裂，含油饱和度高，原油密度较高。条二段致密沉凝灰岩储集层中原油主要来自下伏芦草沟组优质烃源岩，源储纵向相距100-500m，烃源岩生成的中质原油经油源断裂向上运移至条二段储集层中聚集，具有他源充注、源储分离的聚集特征。致密油分布主要受芦草沟组烃源岩和条二段沉凝灰岩储集层控制。马朗一条湖凹陷条二段致密油甜点区勘探面积约203km^2，预测甜点区资源量2．4×10^8t。

英文摘要：

Based on seismic data, logging, mud logging and lab testing data, the geological features and exploration potential of Permian Tiaohu Formation tight oil were studied in Santanghu Basin, Harni Area, Xinjiang. The tight sedimentary tuff characterized as high porosity and low permeability is developed in the second member of Tiaohu Formation in Santanghu Basin, and its granularity is fine, nano-scale pores and throats account for 88.3%, its permeability is lower than 0.5× 10^-3μm^2. Because of high brittleness, the reservoir rocks are easy to be fractured, and its oil saturation and crude oil density are high. The oil in tight sedimentary tuff is mainly from the underlying Permian Lucaogou Formation high-quality source rocks with a 100-500 m interval between source rocks and reservoirs. The crude oil generated in source rocks migrated up to the second member of Tiaohu Formation along faults and fractures characterized as other-sourced charging and source-reservoir separating. Tight oil distribution is mainly controlled by Lucaogou Formation source rocks and second member of Tiaohu Formation sedimentary tuff reservoirs. The area of ＂sweet spots＂ in the second member of Tiaohu Formation of Malang-Tiaohu Sag is about 203 km2, and the oil resource is predicted to be 2.4× 10^8 t.