普光气田飞仙关组滩相储层孔隙类型、孔喉半径及渗透率模型
Pore Type, Pore Throat Radius and Permeability Model for Shoal Facies Reservoirs in Feixianguan Formation, Puguang Gasfield, China

普光气田深层滩相储层孔隙类型多样、孔隙结构复杂、孔渗相关性差，造成渗透率解释及开发地质评价的困难。基于大量岩心薄片、物性及压汞实验分析，明确飞仙关组主要发育粒间孔、复合孔及粒内孔，粒间孔的孔渗相关性好，复合孔及粒内孔差。优选中值孔喉半径作为孔隙结构评价的参数，明确粒间孔隙的中值孔喉半径与渗透率相关性最好。引入储层品质指数，建立粒间孔储层的渗透率与孔隙度、中值孔喉半径的关系模型，结果验证解释渗透率与实测渗透率相关性好；并进一步明确该模型不适合复合孔及粒内孔储层的物性解释。该认识对飞仙关组储层测井渗透率解释、储层评价及渗流能力评价提供有价值的支撑。
It is difficult in permeability interpretation and geological development evaluation because of the multiple pore type, complicated pore structure and poor correlation between porosity and permeability in deep shoal reservoirs of Puguang Gasfield. Based on abundant data of thin sections, properties and mercury injection experiments, it is confirmed that are inter-pores, multi-pores and intra-pores in Feixianguan Formation. The correlation between porosity and permeability is good in inter-pore and but poor in multi-pores and intra-pores. Optimizing the median pore throat (MPT) radius as evaluating pore structure and choosing the reservoir quality index (RQI), the good correlation between MPT and permeability can be recognized and the interpreted model of MPT, permeability and porosity can be constructed in inter-pore, but this model is not suitable for intra-pore and multi-pore. The results should be a valuable support for permeability interpretation, reservoir and flowing capacity evaluation.