页岩无机质孔隙含水饱和度分布量化模型

doi:10.7623/syxb201607009

石油学报 ›› 2016, Vol. 37 ›› Issue (7): 903-913.DOI: 10.7623/syxb201607009

页岩无机质孔隙含水饱和度分布量化模型

李靖¹, 李相方¹, 王香增², 李莹莹³, 石军太¹, 冯东¹, 白艳改¹, 徐敏¹

1. 中国石油大学石油工程教育部重点实验室北京 102249;
2. 陕西延长石油集团有限责任公司陕西西安 710075;
3. 中海油研究总院北京 100027

收稿日期:2015-12-15 修回日期:2016-04-06 出版日期:2016-07-25 发布日期:2016-07-28
通讯作者: 李相方,男,1955年5月生,1982年获华东石油学院学士学位,1992年获石油大学(华东)博士学位,现为中国石油大学(北京)教授、博士生导师,主要从事油气田开发理论与系统工程研究。Email:lixf2013@vip.163.com
作者简介:李靖,男,1990年12月生,2012年获中国石油大学(北京)学士学位,现为中国石油大学(北京)博士研究生,主要从事页岩气等非常规天然气开发研究。Email:lijingsuc@163.com
基金资助:
国家自然科学基金重大项目（No.51490654）、国家重大科技专项（2016ZX05039，2016ZX05042）资助。

A quantitative model to determine water-saturation distribution characteristics inside shale inorganic pores

Li Jing¹, Li Xiangfang¹, Wang Xiangzeng², Li Yingying³, Shi Juntai¹, Feng Dong¹, Bai Yangai¹, Xu Min¹

1. Key Laboratory of Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing 102249, China;
2. Shaanxi Yanchang Petroleum (Group) Corporation Limited, Shaanxi Xi'an 710075 , China;
3. CNOOC Research Institute, Beijing 100027, China

Received:2015-12-15 Revised:2016-04-06 Online:2016-07-25 Published:2016-07-28

摘要/Abstract

摘要：

目前对于页岩储层含水饱和度的评价多侧重于宏观尺度，而对页岩纳米孔隙内含水饱和度分布特征缺乏深入研究。在考虑页岩储层"超低含水饱和度"特征基础上，分析了储层液态水与气态水热力学平衡关系，结合水膜理论，建立了页岩无机质孔隙水膜厚度量化模型。研究表明：孔隙尺度、孔隙形状及天然气相对湿度是影响水膜厚度的主要因素；在原始含水条件下，部分微小孔隙可以被毛细管水充填，以研究样品为例，当储层含水饱和度为50 % ，天然气相对湿度为0.98时，孔隙直径为5.35 nm以内的孔隙将被毛细管水阻塞，此类孔隙对页岩气的吸附及流动不起作用。在微观尺度下，研究孔隙类型、孔隙半径、孔隙形状等对含水饱和度的影响规律对进一步认识页岩储层流体赋存方式、吸附特征及产气机理具有重要意义。

关键词: 页岩, 无机质, 水膜, 含水饱和度分布, 有效孔隙分布

Abstract:

Currently, assessments of water saturation in shale reservoirs are mainly performed by macro-scale methods, while there is less in-depth research on the micro-scale distribution characteristics of water inside shale porosity. Based on considering the ultra-low water saturation condition of shale reservoirs, the thermodynamic equilibrium between liquid water and gaseous water is analyzed. Then the quantitative model for determining water film thickness in shale inorganic pores is established in combination with water film theory. Research results show that the pore size, pore shape and relative humidity of gas phase are the main influential factors for water film thickness. Meanwhile, it is found that a part of micropores can be filled by capillary water under initial reservoir condition. Taking the sample in this study as an example, when reservoir water saturation is 50 % and natural gas relative humility is 0.98, the pores with size less than 5.35 nm will be blocked by capillary water, so that such pores will have no effect on shale gas absorption and transport. Therefore, the micro-scale study of the influences of pore types, sizes and shapes on water saturation is of great significance to further understand the fluid occurrence pattern, adsorption characteristics and gas generation mechanism of shale reservoirs.

Key words: shale, inorganic matter, water film, water saturation distribution, effective pore distribution

中图分类号:

TE319

李靖, 李相方, 王香增, 李莹莹, 石军太, 冯东, 白艳改, 徐敏. 页岩无机质孔隙含水饱和度分布量化模型[J]. 石油学报, 2016, 37(7): 903-913.

Li Jing, Li Xiangfang, Wang Xiangzeng, Li Yingying, Shi Juntai, Feng Dong, Bai Yangai, Xu Min. A quantitative model to determine water-saturation distribution characteristics inside shale inorganic pores[J]. Acta Petrolei Sinica, 2016, 37(7): 903-913.

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页岩无机质孔隙含水饱和度分布量化模型

A quantitative model to determine water-saturation distribution characteristics inside shale inorganic pores

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