致密油储层可动流体赋存特征  

Characteristics of occurrence of movable fluid in tight oil reservoirs

作　　者：赵国玺[1,2] 张瀚丹[1,2] 郑光辉[1,2] 成良丙[1,2] 王冲[1,2] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院 [2]低渗透油气田勘探开发国家工程实验室

出　　处：《低渗透油气田》2016年第1期111-114,共4页

摘　　要：致密油储层物性差，孔喉细微，可动流体赋存特征研究对于进一步认清致密油储层渗流特征及开发潜力很有必要利用离心实验和核磁共振实验手段．确定了0．05μm为致密油储层可动喉道半径门限值．核磁共振T2界限值平均为18．44ms。随着物性逐渐变好，流体可动用程度也随之增加、随着物性变差．纳米级和亚微米级孔喉含量及其空间内的可动流体逐渐占据主导。根据油井试油数据及水平井岩心分析数据确定致密油储层渗透率下限为0．03mD，此时流体饱和度下限为20％。研究结论为后期认识致密油渗流规律．确定开发对策提供了理论依据.Tight oil reservoirs are with poor physical properties, and tiny pores-throat. It is necessaD＂ to study the occurrence characteristics of the movable fluid for further clarifying the percolation characteristics and development potentials of tight oil reservoirs. Using the measures of centrifugal expeliment and NMR （nuclear magnetic resonance）, it is determined that 0. 05 μm was the threshold value of the throat radius for mobile-oil of tight reservoirs, and the average T2 boundary value of NMR is 18.44 ms. As the physical properties gradually get better, recoverability degree of the fluid increased. As the physical properties get worse, the movable fluid in the space and the proportion of the nano-and sub-micron pores-throats are gradually dominant. According to the oil well test data and core analysis data from the horizontal wells, the lower limit of permeability of tight oil reservoirs is determined to be 0. 03roD. In this case the lower limit of the fluid saturation is 20%. The research conclusions provide a theoretical basis for understanding the law of tight oil percolation in the late period, and for determining the development countermeasures.

关 键 词：致密油储层 核磁共振 可动流体 

分 类 号：TE348[石油与天然气工程—油气田开发工程]