碎屑岩储集层中绿泥石包膜的研究现状

发布时间：2018-01-11 08:21

本文关键词：碎屑岩储集层中绿泥石包膜的研究现状　出处：《古地理学报》2017年01期 　论文类型：期刊论文

【摘要】：绿泥石包膜在国内外碎屑岩储集层中常有发现,其对石英次生加大的抑制及对储集层物性的影响一直是国内外学者的研究热点。本文回顾了绿泥石包膜的研究历史,总结了其研究成果,包括微观赋存状态、形成时间和机理、控制因素、对石英次生加大的抑制和对储集层物性的影响等。结果表明:(1)储集层中绿泥石包膜主要偏富铁,具连续生长的双层结构,符合"Ostwald"熟化过程,始于早期富铁黏土包膜,早成岩期转化为平行或斜切颗粒表面的内层包膜,逐渐向外生长为垂直颗粒表面的孔隙衬里绿泥石,并可在埋藏成岩过程持续生长;(2)富含铁镁矿物的火山物质(火山岩岩屑和火山灰)及暗色矿物(黑云母和角闪石等)是形成绿泥石包膜的主要物质来源,并主要富集在三角洲入海(湖)的高能水动力相带,如三角洲前缘水下分流河道及河口坝等沉积微相中,烃类充注影响孔隙衬里绿泥石的生长形态;(3)中低温环境绿泥石包膜明显抑制石英次生加大的生长,高温环境抑制效果减弱;(4)绿泥石包膜的发育有利于粒间孔隙的保护,但易降低孔隙喉道的连通性。最后指出了绿泥石包膜在目前研究中存在的问题和今后的研究趋势。
[Abstract]:Chlorite coating is often found in clastic rock reservoirs at home and abroad. The inhibition of quartz secondary growth and the effect on reservoir physical properties have been the hot research topics of domestic and foreign scholars. This paper reviews the research history of chlorite coating and summarizes its research results including microscopic occurrence state. The formation time and mechanism, the controlling factors, the inhibition of quartz secondary growth and the effect on reservoir physical properties, etc. The results show that the chlorite coating in the reservoir is mainly rich in iron and has a continuous growth bilayer structure. The "Ostwald" maturation process begins with the early iron rich clay coating, and during the early diagenesis stage it is transformed into an inner coating on the surface of parallel or oblique particles. It gradually grows out as pore lining chlorite on vertical grain surface and can continue to grow during buried diagenesis. (2) volcanic materials (volcanic rocks and ash) and dark minerals (biotite and hornblende) rich in iron and magnesium minerals are the main material sources for forming chlorite coating. And it is mainly concentrated in the high-energy hydrodynamic facies belt of delta entering sea (lake), such as delta front underwater distributary channel and estuary dam. Hydrocarbon filling affects the growth pattern of pore lining chlorite. (3) chlorite coating obviously inhibited the secondary growth of quartz in the medium and low temperature environment, but the inhibition effect in the high temperature environment was weakened. 4) the development of chlorite coating is beneficial to the protection of intergranular pores, but it is easy to reduce the connectivity of pore throat. Finally, the existing problems and future research trends of chlorite coating are pointed out.
【作者单位】：中国石油大学(华东)地球科学与技术学院;中国石油大学(华东)山东省油藏地质重点实验室;
【基金】：国家油气重大专项子课题(编号:2011ZX05006-004) 中央高校基本科研业务费专项资金项目(编号:16CX06037A)联合资助~~
【分类号】：P618.13;P578.962
【正文快照】： 1引言随着中深层碎屑岩储集层异常高孔带研究的不断深入,学者们对其成岩作用特征、异常高孔隙度的成因及分布开展了大量研究(远光辉等,2015)。其中,Enrenberg(1993)、Bloch等(2002)、Anjos等(2003)均发现,中深层碎屑岩储集层异常高孔带的存在常与绿泥石包膜的发育有关,其对石

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