非常规油气致密储集层微观结构研究进展  

Research advances of microstructure in unconventional tight oil and gas reservoirs

作　　者：朱如凯[1,2] 白斌[1,2] 崔景伟[2] 吴松涛[2] 崔京钢[1,2] 王拓[2] 牛露[2] 李婷婷[2] 

机构地区：[1]提高石油采收率国家重点实验室,北京100083 [2]中国石油勘探开发研究院,北京100083

出　　处：《古地理学报》2013年第5期615-623,共9页Journal of Palaeogeography：Chinese Edition

基　　金：国家科技重大专项(编号:2011ZX05001-002);国家自然科学青年基金项目(编号:41002034);中国石油勘探开发研究院级基金(编号:2012Y-007)联合资助

摘　　要：致密储集层储集性能差,孔喉以纳米级为主,孔喉连通复杂。中国南方高过成熟海相页岩有机质纳米孔与粒内孔大小约为20～890 nm;陆相泥页岩孔喉类型为有机质孔与基质孔,主体介于30～200 nm之间;致密砂岩微米级孔喉为粒间溶孔、颗粒溶蚀孔与微裂缝,主体介于10～200μm之间,纳米级孔隙大小介于70～400 nm之间,以原生粒间孔与自生矿物晶间孔为主;致密灰岩孔喉类型有方解石粒内溶孔、粒间溶孔与微裂缝,大小介于50～500 nm之间。页岩微孔喉总体随热演化程度增高呈先减少后增加趋势,致密含油砂岩中油气赋存有4种状态,粒间微孔为油气赋存最有利位置。针对非常规油气储集层独特特征,仍需在仪器研发、技术方法与评价参数等方面加强研究探索。Nano-pores dominate the storage space of tight reservoirs and the connectivity of pore throat system is complex. The diameter of organic matter pores and intra-particle pores in marine shale with high maturity of southern China are 20- 890 nm. The pores in terrestrial shale are organic matter pores and matrix pores, with diameter between 30-200 nm. The storage space in tight sandstone includes dissolu- tion pores and micro-fractures with diameter in 10-200 μm. Nano-pores are composed by inter-particle pores and inter-crystal pores with diameter 70-400 nm. The calcite dissolution pores, inter-particle disso- lution pores and micro-fractures dominate the nano-pores in tight limestones and the diameter is 50-500 nm. Reservoir digenetic modeling data indicates that total porosity in shale increases firstly and de- creased later with the increase of temperature and pressure. Four occurrences of oil in nano-pores have been distinguished and inter-particle pores are the most favorable for the oil accumulation. Moreover, due to the special characteristics of unconventional oil and gas, further work should be focused on the instru- ment improvement, technology innovation and evaluation parameter optimization.

关 键 词：非常规油气储集层 微观孔喉表征 孔喉演化 油气赋存状态 

分 类 号：P588.245[天文地球—岩石学]