油气充注对塔中志留系沥青砂岩储集性影响的模拟实验研究  

Laboratory Simulation of Oil/gas Filling into Silurian Asphalt Sandstones and Its Impact on Reservoir Quality in Tazhong Area

作　　者：陈强路[1] 范明[2] 郑伦举[2] 

机构地区：[1]中国地质大学(北京) [2]中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214151

出　　处：《沉积学报》2007年第3期358-364,共7页Acta Sedimentologica Sinica

基　　金：中国石化股份有限公司科技部项目(编号:P03065)资助

摘　　要：志留系储层原油演化成沥青过程中,沥青充填于粒间孔及填隙物中,占据了孔隙空间,残余孔隙率、渗透率很低。通过模拟实验的方法分析了油气充注对沥青砂岩储集性的影响,早期充填沥青少而残余孔隙率、渗透率很低的砂岩,晚期油气仍不能充注,是非储层;早期沥青均匀充填、充填程度高,残余孔隙率、渗透率低的砂岩,晚期低粘度稀油仍能充注,孔隙率、渗透率有大幅度提高,是有效储层;早期沥青充填较均匀,残余孔隙率相对较高,不同粘度的原油充注后,孔渗条件发生明显的改善。常温的实验表明,原油的物理性质是决定沥青砂岩能否再次充注的关键因素之一,稀油充注是志留系沥青砂岩成藏的必要条件。Asphalt filling into pore of in ability during transformation of crude oil terparticle and matrix reduced pore space while decreased porosity and permeinto asphalt in Silurian reservoir sandstone in Tazhong area. Impact on reservoir quality of oil/gas filling into reservoir of asphalt sandstones has been studied by means of laboratory simulation. Sandstone with fewer asphalt and lower porosity and permeability at early stage of oil/gas infilling is non-reservoir and oil/gas can not fill in. Sandstone, whose porosity and permeability could be increased at late stage of oil/gas filling when oil with lower viscosity filled into, was effective oil/gas reservoir when more and uniform asphalt filling as well as the low porosity and permeability at early stage of oil/gas infilling. Sandstone, with uniform asphalt filling as well as higher remained porosity at early stage of oil/gas infilling, whose porosity and permeability could be improved as oil with various viscosity filled into. Simulations under laboratory temperature indicate that physical property of crude oil is the key factor for influence of ability of oil/gas refilling into asphalt sandstones. Filling of oil with low viscosity is essential for oil accumulation in Silurian asphalt sandstones.

关 键 词：塔里木盆地 志留系 沥青砂岩 储集性 模拟实验 

分 类 号：P618.130.2[天文地球—矿床学]