地球物理学进展 ›› 2014, Vol. 29 ›› Issue (1): 324-330.doi: 10.6038/pg20140146

• 应用地球物理 • 上一篇    下一篇

低渗透致密气藏可动流体饱和度研究——以苏里格苏48区块盒8段储层为例

高航, 孙卫, 庞振宇, 张瑞, 马二平   

  1. 西北大学 大陆动力学国家重点实验室/地质学系, 西安 710069
  • 收稿日期:2013-06-16 修回日期:2013-10-20 出版日期:2014-02-20 发布日期:2014-02-20
  • 作者简介:高航,男,1989年生,现正攻读矿产普查与勘探专业硕士学位,主要从事油气田地质与开发的研究.(E-mail:zzhghang@163.com)
  • 基金资助:

    国家科技支撑计划项目(2007BAB17B02)和国家科技重大专项(2011ZX05044)联合资助.

Movable fluid saturation of low-permeability and tight sandstone gas reservoir: taking He8 Section of Block Su 48 in Sulige gas field, as an example

GAO Hang, SUN Wei, PANG Zhen-yu, ZHANG Rui, MA Er-ping   

  1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
  • Received:2013-06-16 Revised:2013-10-20 Online:2014-02-20 Published:2014-02-20

摘要:

利用高压压汞、恒速压汞、核磁共振等实验, 研究分析苏里格苏48区块盒8段储层可动流体饱和度的分布特征及主要控制因素.结果表明, 研究区样品T2谱主要呈左高右低的双峰型及单峰型两种形态, 可动流体饱和度与可动流体孔隙度变化幅度较大.根据可动流体饱和度将储层划为3种类型, 不同类型储层可动流体饱和度差异较大:Ⅰ类、Ⅱ类储层物性较好, 孔隙半径大, 喉道较粗, 孔喉分布均匀, 孔隙连通性好, 粘土矿物质量百分数低, 可动流体饱和度高;Ⅲ类储层孔隙半径小, 孔喉分选差, 孔隙之间连通性差, 粘土矿物质量百分数高, 可动流体饱和度低.可见可动流体饱和度受多种因素综合影响, 其中微观孔喉特征是控制可动流体饱和度大小的主要因素, 粘土矿物次之, 储层物性最弱.孔喉特征参数中, 孔隙半径、孔喉半径比、孔喉体积比、分选系数的控制作用最为显著, 均值系数以及排驱压力的影响较为明显.在其它孔喉参数相差较小时, 喉道对可动流体饱和度的大小起决定性作用;粘土矿物中, 高岭石的质量百分数影响最大.

Abstract:

The distribution characteristics and main factors of controlling reservoir movable fluid saturation of He8 formation of Block Su 48 in Sulige gas field are analyzed by using high pressure mercury injection, constant mercury injection and nuclear magnetic resonance. Results show that: there are two models of T2 spectrum including bimodal and unimodal modes both of which have a relatively higher proportion in the small T2 than that in the large T2; movable fluid saturation and fluid porosity varies a lot. The reservoir can be classified as three types by movable fluid saturation and for each of them, its movable fluid saturation differs obviously. TypeⅠand typeⅡ have fine physical property, large pore radius, coarse throat, well sorted pore-throat, good pores connection, low mass percent of clay minerals and high percent of movable fluid saturation. Type Ⅲ has small pore radius, poor connectivity of pore throat, high mass percent of clay minerals and low movable fluid saturation. Movable fluid saturation is mainly changed by a variety of factors and micro pore-throat structure of reservoirs controls the size of movable fluid saturation a lot, and then is clay minerals, and the physical property has an ignorable effect. Among the parameters of micro feature, pore radius, pore throat radius ratio, pore throat volume ratio and coefficient of sorting are the primary factors controlling the percent of movable fluid saturation and also do the mean coefficient and the entry pressure affect much. When the difference of pore throat parameters is little, the size of movable fluid saturation mainly depends on the throat. At the same time the mass percentage of clay minerals, particularly kaolinite, makes a significant impact on the percentage of movable fluid saturation.

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