页岩等温吸附曲线SLD-PR模拟方法及应用

doi:10.11743/ogg20150121

石油与天然气地质 ›› 2015, Vol. 36 ›› Issue (1): 162-167.doi: 10.11743/ogg20150121

页岩等温吸附曲线SLD-PR模拟方法及应用

胡志明^1,2, 郭为², 熊伟^1,2, 左罗^1,2, 沈瑞^1,2, 高树生^1,2, 杨发荣³, 苗雪⁴

1. 中国科学院渗流流体力学研究所, 河北廊坊 065007;
2. 中国石油勘探开发研究院廊坊分院, 河北廊坊 065007;
3. 中国石油大港油田研究院, 天津 300280;
4. 中国石油华北油田分公司勘探开发研究院, 河北任丘 062550

收稿日期:2014-01-22 修回日期:2014-10-20 出版日期:2015-02-08 发布日期:2015-02-11
第一作者简介:胡志明(1977-), 男, 工程师, 油气田开发.E-mail:huzhiming69@petrochina.com.cn
基金项目:
国家科技重大专项(2011ZX05018-005);国家重点基础研究发展计划("973"计划)项目(2013CB228005).

SLD-PR simulation method for shale adsorption isotherm and its application

Hu Zhiming^1,2, Guo Wei², Xiong Wei^1,2, Zuo Luo^1,2, Shen Rui^1,2, Gao Shusheng^1,2, Yang Farong³, Miao Xue⁴

1. Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang, Hebei 065007, China;
2. Research Institute of Petroleum Exploration & Development-Langfang, PetroChina Langfang, Hebei 065007, China;
3. Exploration & Development Research Institute, Dagang Oilfield Company, PetroChina, Tianjin 300280, China;
4. Exploration and Development Institute, Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062550, China

Received:2014-01-22 Revised:2014-10-20 Online:2015-02-08 Published:2015-02-11
Contact: 郭为(1986-)男, 工程师, 非常规天然气开发.E-mail:guowei19860429@163.com E-mail:guowei19860429@163.com

摘要/Abstract

摘要：

页岩气主要由吸附气和游离气组成，吸附气体的含量直接影响页岩气藏的地质储量和页岩气井的产量。为了准确得到页岩的吸附气含量，以川南地区龙马溪组页岩为研究对象，设计了实验测量了温度在25～45 ℃，压力在0～8 MPa范围内页岩吸附甲烷的等温吸附曲线，发现页岩的吸附气量随着温度的升高而减少。通过简化局部密度函数（SLD-PR）理论计算了不同温度下页岩的等温吸附曲线并且与实验结果作对比，结果表明该方法可以用来计算页岩等温吸附曲线。利用SLD-PR方法预测了页岩气藏储层温度和压力条件下等温吸附曲线，弥补了高温高压下实验测量页岩等温吸附曲线误差大的不足。同时对比了利用SLD-PR方法和Langmuir方法计算的吸附气量，发现利用Langmuir方程计算得到的吸附气含量偏大，利用SLD-PR方法计算得到的页岩吸附气含量更加可靠。

关键词: 甲烷, 简化局部密度函数法(SLD), 等温吸附, 页岩气

Abstract:

Shale gas is mainly composed of adsorption gas and free gas.Adsorption gas content directly affects the geolo-gical reserves and well production for a shale gas reservoir.In order to accurately measure adsorption gas content, isothermal adsorption experiments were performed within temperature range of 25-45 ℃ and pressure range of 0-8 MPa on the Longmaxi Fm shale in South Sichuan Basin.Results indicate that shale adsorption capacity decreases as temperature increases.In addition, shale adsorption isotherms at different temperatures were calculated by using the simplified local density (SLD-PR) method and compared with the experimental results.The comparison shows that this method can be used to calculate shale adsorption isotherm.The SLD-PR method can be used to predict shale adsorption isotherm under reservoir pressure and temperature conditions, thus overcoming the disadvantage that the errors of isotherm experimental measurements under high temperature and pressure are large.Comparison between the calculated adsorption gas content by the SLD-PR method and that by the Langmuir method indicates that the former is more accurate and reliable than the latter.

Key words: methane, the simplified local density method(SLD), isothermal adsorption, shale gas

中图分类号:

TE132.2

胡志明,郭为,熊伟,等. 页岩等温吸附曲线SLD-PR模拟方法及应用[J]. 石油与天然气地质, 2015, 36(1): 162-167. doi: 10.11743/ogg20150121 Hu Zhiming,Guo Wei,Xiong Wei,et al. SLD-PR simulation method for shale adsorption isotherm and its application[J]. Oil & Gas Geology, 2015, 36(1): 162-167. doi: 10.11743/ogg20150121

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页岩等温吸附曲线SLD-PR模拟方法及应用

SLD-PR simulation method for shale adsorption isotherm and its application

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