恒速压汞技术在长2储层孔隙结构研究中的应用

恒速压汞技术是储层微观孔隙结构定性和直观分析的先进技术之一。文中应用该技术对定边油田张韩区块长2储层微观孔隙结构进行分析研究．得到了孔隙与喉道的大小及其分布频率等参数。在此基础上．分析了孔隙大小、孔隙体积、喉道大小及孔喉比等参数对微观孔隙结构的影响。分析结果表明，低渗透储层有效喉道半径越大，其渗流通道越宽，不同渗透率级别的低渗储层．其差异主要体现在喉道大小及分布上；喉道特征是决定储层物性的关键因素，不同渗透率级别的储层岩石由不同半径的喉道控制；储层岩石的孔喉比参数对水驱油渗流特征、剩余油微观分布特征及驱油效率等均有较大影响。

Application of ASPE technology in pore structure study of Chang 2 reservoir

ASPE is one of the advanced technologies applied in reservoir micro-pore structure quality determination and audiovisual analysis.With the application of this technology,the pore structure of Chang 2 reservoir in Zhanghan Area of Dingbian Oilfield is analyzed and the influential factor of pore size and pore volume,throat size and throat volume on microcosmic pore structure are studied in this paper.Some important parameters such as the pore and throat sizes and their distribution frequency have been obtained.The analysis has demonstrated that the width of its seepage path extends with the extension of effective throat radius.The discrepancy of different level permeability of low permeability reservoir is mainly reflected in the throat size and distributioa The throat characteristics of the low permeability reservoir are the crucial factors that decides if the physical quality is good in low permeability layer.Different permeability of reservoir is decided by different throat radiuses.Pore-throat ratio has prominent influence on filtration characteristics,microcosmic distributed characteristics of remaining oil and displacement efficiency.