通过构建基于地层岩石电导率的动态渗透率图版求取致密砂岩储层渗透率方法  

Method of Calculating Tight Sandstone Reservoir Permeability by Creating Dynamic Permeability Chart Based on Formation Rock Conductivity

作　　者：焦乃林 丁文龙[1] 尹帅[1] 王濡岳 曹翔宇[1] 

机构地区：[1]中国地质大学能源学院,海相储层演化与油气富集机理教育部重点实验室,页岩气资源战略评价国土资源部重点实验室,北京100083

出　　处：《科学技术与工程》2016年第21期20-26,共7页Science Technology and Engineering

基　　金：国家自然科学基金面上项目(41372139、41072098);国家科技重大专项专题(2011ZX05018-001-002、2011ZX05009-002-205、2011ZX05033-004)资助

摘　　要：渗透率是致密砂岩储层评价的一个重要参数,关系到甜点区预测、储层分级、单井产能评价及提高采收率方案的合理制定;但该参数受区域构造背景、复杂孔隙结构、地层各向异性、强非均质性及束缚水饱和度的综合影响,其准确预测较为困难,常规预测方法效果往往不佳。针对这一现状,从微观尺度层面着手,联合Hanai-Bruggeman方程和Kozeny-Carman方程,建立了同时考虑地层岩石电导率(Cs)、颗粒电导率(Cg)、地层水电导率(Cw)及胶结指数(m)的致密砂岩动态渗透率预测模型,绘制了岩石动态渗透率解释图版,提出了新的致密砂岩储层渗透率解释方法。利用所建立的关系图版可以对致密砂岩储层动态渗透率进行取值,通过与试井或实验测试所获得的岩石静态渗透率进行对比、校正,从而对致密砂岩储层渗透率进行预测。将该方法应用于川西上三叠统致密砂岩储层,取得了较好的应用效果,储层渗透率预测平均绝对误差为0.035 m D。通过与常规预测方法进行对比,体现出提出方法的优势。因而,该方法具有一定推广应用价值。Permeability is an important parameter in tight sandstone reservoir evaluation, it is related with dissert area prediction, reservoir classification, single well production ability evaluation and the plan formulation of im-proving estimate recovery. But, this papameter is strongly affected by reginal tectonic background, complex pore structure, formation anisotropy, strong heterogeneity and the irreducible water saturation, and the implementation of accurate prediction is very hard. Based on this status, research from micro scale, combining Hanai-Bruggeman and Kozeny-Carman equation was made of, created a tight sandstone reservoir dynamic permeability forcasting model that considering rock conductivity（ , grain conductivity （Cg） , formation water conductivity （Cw） and cementa-tion index （m） at the same time. Rock dynamic permeability interpretation chart also was presented, and put for-ward a new tight sandstone reservoir permeability interpretation method. Using the chart created, the dynamic tight sandstone permeability can be selected, by comparing and modified with the rock static permeability obtained by well test or lab tests, the permeability of tight sandstone reservoir can be forcasted. By using this method into some tight sandstone reservoir in West Sichuan basin, a good application effect is achieved, the absolute error of reser-voir, s permeability is 0. 035 mD. By comparing with the conventional forcasting methods, the advantage of method proposed is reflected. So, This new method has some promotion application value.

关 键 词：致密砂岩储层 电导率 渗透率 图版 电阻率 孔隙度 

分 类 号：P631.322[天文地球—地质矿产勘探]