X射线小角散射法研究页岩成熟演化过程中孔隙特征  

Evolution of pores in shale during thermal maturation using Small Angle X-ray Scattering(SAXS)

作　　者：田华[1,2,3] 张水昌[1,2] 柳少波[1,2,3] 高原[4] 张洪[1,2,3] 王茂桢 郝加庆[1,2,3] 郑永平[1,2,3] 张涛[4] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]提高石油采收率国家重点实验室,北京100083 [3]中国石油盆地构造与油气成藏重点实验室,北京100083 [4]北京市理化分析测试中心,北京100089 [5]中国石油大学(华东)地球科学与技术学院,山东青岛266555

出　　处：《石油实验地质》2016年第1期135-140,146,共7页Petroleum Geology & Experiment

基　　金：中国石油天然气股份有限公司科技攻关项目"油气勘探新领域;新理论;新方法;新技术研究"(2014A-0214)与"深层油气勘探开发理论认识与技术集成"(2014E-3209);国家重大科学仪器设备开发专项(2013YQ17046305);中国石油勘探开发研究院院级项目(2012Y-062)共同资助

摘　　要：对基于同步辐射的X射线小角散射(SAXS)定量研究页岩纳米孔隙分布的方法进行了探索。SAXS方法可以测定页岩在微孔和介孔范围内的孔径体积分布,有效测定页岩封闭孔隙和连通孔隙,而且测试快速,样品量较大。将该方法用于研究页岩在微孔和介孔范围内的成熟演化过程中孔隙变化,对人工热模拟不同成熟度的固体产物和自然样品进行SAXS纳米孔隙测定。随着热演化程度升高,孔隙逐渐增大,在不考虑地层压实情况下,孔径增大可达35%。增加的孔隙主要来自烃类生成过程中形成的有机质孔,高过成熟页岩有利于页岩孔隙发育,增大页岩气的储集空间。Nano pores in shale were measured quantitatively using a Small Angle X-ray Scattering （SAXS） method in this study. The volume fraction and distribution function of open and closed pores in the range of miro-pore and meso- pore were obtained in a quick measurement. To quantitatively analyze pore evolution in shale during thermal matura- tion, some artificial pyrolysis residues of different temperatures and some natural core samples were obtained for SAXS pore measurement. Results show that with the increase of thermal maturity, pore abundance becomes higher. From 300 ℃ to 600 ℃, pore width can increase by 35% without considering formation compaction. It is inferred that mature and over-mature shale can develop abundant organic pores, which are advantageous for shale gas storage

关 键 词：小角散射 成熟演化 孔隙分布 页岩 

分 类 号：TE122[石油与天然气工程—油气勘探]