鄂尔多斯盆地致密油储层微观孔喉结构定量分析  

Quantitative Analysis of Microscopic Pore-throat Structure of Tight Oil Reservoir in Ordos Basin

作　　者：王明磊[1,2] 刘玉婷[2] 张福东[2] 李君[2] 杨慎[2] 邵丽艳[2] 

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《矿物学报》2015年第3期318-322,共5页Acta Mineralogica Sinica

基　　金：国家油气重大专项(编号:50430503);国家油气重大专项(编号:2011ZX05007-002)

摘　　要：针对鄂尔多斯盆地致密油储层特点,利用世界领先的微米-纳米级CT扫描、场发射扫描电镜和恒速压汞等技术,对储层孔隙喉道、孔喉配置关系和填隙物等微观结构进行系统研究。研究结果表明,孔隙大小决定致密油储层的储集能力,储层孔隙平均半径约为0.5~10μm;喉道大小是开发下限主要制约因素,喉道半径主要分布在0.3~0.9μm;渗透率低的储层孔喉比大,喉道制约孔隙中流体的移动,控制储层输导能力。孔隙中填隙物含量高且以伊利石为主,伊利石粒度小、可塑性强,水化膨胀后易发生运移堵塞孔道,使储层渗透性降低,降低孔隙的输导能力。Responding to tight oil reservoir characteristics of the Ordos Basin, using the world＇s leading micro-nano grade CT scanning, field emission scanning electron microscope and the constant pressure technology, a systematic research on the microstructure characteristics of reservoir pore and throat, pore-throat allocation relation and interstitial material was conducted, and the quantitative analysis data were obtain. Results suggests that size of pores decides the reservoir capacity of tight oil reservoir. Average radius of pores is from 0.5μm to 10μm. The size of throats is the main restricted factor for the development limit. Throats size ranges between 0.3μm and 0.9μm. Low permeability reservoir has high pore throat ratio. Throat restricts the movement of the fluid in pore, and greatly reduces the reservoir transporting ability. Pore interstitial material content is high and dominated by illite. Illite particle has small size and strong plastic characteristics, and its hydration expansion easily leads to pore plugging makes reservoir permeability decreased and reduces the transporting ability of pore.

关 键 词：致密油储层 储层微观特征 孔喉结构 鄂尔多斯盆地 

分 类 号：P618[天文地球—矿床学]