苏里格气田致密砂岩微观孔喉分布及流动特征  

Pore Throat Distribution and Flow Characteristics of Tight Sandstone in Sulige Gasfield

作　　者：代榕[1] 罗顺社[2,3] 吕奇奇 魏新善[4] 

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,武汉430100 [2]中国地质大学构造与油气资源教育部重点实验室,武汉430074 [3]非常规油气湖北省协同创新中心,武汉430100 [4]中国石油长庆油田公司,西安710018

出　　处：《地质科技情报》2017年第3期144-149,共6页Geological Science and Technology Information

基　　金：国家自然科学基金项目(41672099);"构造与油气资源"教育部重点实验室开放课题(TPR-2015-13);长江青年基金项目(2015cqn73;2016cqn16)

摘　　要：为更好地研究致密砂岩储层中的"纳米油气",需对纳米级储集体有正确的认识。高压压汞实验资料可以用来统计储层孔喉半径频率分布情况以及不同半径区间的孔喉对储层渗透率的贡献率,而渗透率贡献率可以反映流体在不同尺度孔喉中的流动能力。对苏里格气田盒8、山1段总计256块样品高压压汞数据进行了分析,结果表明:苏里格气田致密砂岩储层发育微米级孔喉、亚微米级孔喉和纳米级孔喉三大孔喉类型,总体以纳米级孔喉和亚微米级孔喉为主,其中亚微米级孔喉对储层渗透率的贡献最大,其次为微米级孔喉,纳米级孔喉几乎不参与流动;Ⅰ类储层主要由亚微米级孔喉和微米级孔喉组成,微米级孔喉对储层渗透率起主导作用;Ⅱ类储层主要由亚微米级孔喉和纳米级孔喉组成,对储层渗透率贡献最大的仍然是微米级孔喉,其次是亚微米级孔喉;Ⅲ、Ⅳ类储层则较为相似,均以纳米级孔喉为主,亚微米级孔喉在初期对储层渗透率具有主导作用。The study of the ＂nanometer oil and gas＂ in the tight sandstone reservoir reqmres a correct UIl- derstanding of the nano-scale reservoir. High pressure mercury test data can be used to estimate the fre- quency distribution of pore throat radius and the contribution rate of the pore throats in different radius to reservoir permeability, while the permeability contribution rate can reflect the flow capacity of the fluid in the pore throats on different scales. The analysis of a total of 256 samples of high pressure mercury data of Sulige Gasfield HeS, Shan 1 shows that, the tight sandstone reservoir in this gasfield is mainly composed of micro pore throats, submicron pore throats and nano scale pore throats. Among them, the nano scale pore throats and submicron pore throats are the main components. The contribution of submicron pore throats to reservoir permeability is the largest, followed by micron grade pore throat, while the nano scale pore throats almost does not participate in the flow. Class Ⅰ reservoir is mainly composed of submicron pore throats and micro pore throats. The micro pore throats plays a leading role in reservoir permeability. Class Ⅱ reservoir is mainly composed of submicron pore throats and nano scale pore throats. They have the largest contribution to the reservoir permeability, followed by submicron pore throats The class Ⅲ and Ⅳ reservoirs are similar. Both of them are mainly composed of the nano scale pore throats, and the submi- cron pore throats have a leading role in the reservoir permeability.

关 键 词：苏里格气田 致密砂岩 微米级孔喉 亚微米级孔喉 纳米级孔喉 流动能力 

分 类 号：P618.13[天文地球—矿床学]