关键词: 砂泥岩复杂储层, 三水模型, 双孔隙介质储层, 大庆探区

Abstract: Based on the in-depth analysis of bottlenecks in logging assessment of sandy-shale reservoirs and deep-layer volcanic rock reservoir in the northern part of Songliao Basin as well as the epimetamorphic rock dual-pore reservoirs in Hailaer, it is pointed out that the assessment is inaccurate that the sandy-shale reservoirs produce oil or water or produce oil and water at the same time. The main reason lies in assessment of water flowing property. The conception on free water, micro pore water and clay water is proposed in the light of the sandy-shale pore medium reservoir. Based on this conception, the saturation model of the water of three types is established. This model provides the new and effective means for assessment of oil and water flowing property, achieving good results in actual application. With the help of core scale logging method, the basic study is conducted to identify the lithologic character and quantitatively calculate the parameters of fractures. With adoption of conventional and imaging logging technologies, plates are formulated to identify the lithologic character of volcanic rock. The imaging and dual-lateral fracture width calculation formula is also revised. It is clarified that the imaging spectrum analysis technology is the most effective way for assessment of the physical properties of the epimetamorphic compact sandstone reservoir characterized in broken and network-shape fractures. The lithologic coefficient a and bond index m in the Archie model are also made available. The study has developed a complete set of methods to assess the dual-pore medium reservoir, including the methods and criteria for detailed division of volcanic rock reservoirs as well as identification of fluid properties. Those methods have achieved satisfactory results in actual production.