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川西地区侏罗系致密砂岩储层孔喉特征对渗流能力的影响
Pore-throat characteristics and percolation capacity of Jurassic tight sandstone reservoirs, western Sichuan Basin
江蓉蓉 李 涛 严焕榕 卜 淘
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DOI:
作者单位:中国石化股份公司西南油气分公司勘探开发研究院
中文关键字:低渗透致密砂岩 恒速压汞 孔喉特征 孔喉比 渗流能力
英文关键字:Low-permeability tight sandstone; Constant-rate mercury injection; Pore-throat characteristics; Pore-throat ratio; Percolation capacity
中文摘要: 针对川西地区侏罗系致密砂岩气藏储层,通过物性分析、铸体薄片、扫描电镜和恒速压汞等实验分析,对储层微观
孔喉特征进行研究。分析发现在评价低渗储层渗流特征时,储层渗透率与孔隙度、喉道半径的相关性不高,但渗透率与恒速压汞
得到的孔喉比值具有较好相关关系。研究认为,受岩石学特征和储层成岩作用的控制,川西侏罗系致密砂岩低渗储层的孔隙、喉
道类型多样,孔喉结构复杂,储层渗透性受喉道与孔隙的匹配控制。孔喉比值不仅反映了储层喉道、孔隙特征,还能表征孔隙与
喉道匹配的均匀程度。储层孔喉比值较小,表明孔隙和喉道匹配均匀程度高,储层的渗透性较好。反之,储层孔喉比值较大,表
明孔隙和喉道匹配均匀程度差,储层的渗透性较差。因此,对于孔喉结构复杂的低渗致密砂岩储层,孔喉比值能较好地反映储层
的渗流能力。开展孔隙、喉道及孔隙和喉道匹配关系综合分析,能够更好地分析致密砂岩低渗储层渗流能力。

DOI: 10.12055/gaskk.issn.1673-3177.2018.02.009



英文摘要:For the Jurassic tight sandstone gas reservoirs, western Sichuan Basin, their microscopic pore-throat characteristics were
investigated through experimental analysis of physical properties, casting thin section, SEM, and constant-rate mercury injection.
Moreover, after an evaluation on the percolation of low-permeability reservoirs, it is found that their permeability is less correlated
with porosity and throat radius, but in good correlation with pore-throat ratio obtained from constant-rate mercury injection. Results
show that in the Jurassic tight sandstone reservoirs with low permeability, (1) under the control of petrological characteristics and diagenesis,
there are many types of pores and throats, the pore-throat structures are complex, and the permeability is not only related to
throat radius but also controlled by pore-throat configuration; (2) the pore-throat ratio not only reflects the characteristics of pores and
throats, but also features the uniform degree of pore-throat configuration; and (3) lower pore-throat ratio indicates high uniform degree
of pore-throat configuration and better permeability, and vice versa. As for those tight sandstone reservoirs with complex pore-throat
structures, therefore, pore-throat ratio can better reflect the percolation capacity. Certain comprehensive analysis on pores, throats, and
pore-throat configuration is conducive to identifying this capacity.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
主管单位:中国石油西南油气田公司  主办单位:中国石油西南油气田公司勘探开发研究院
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