页岩超临界态吸附气量计算模型

doi:10.11885/j.issn.1674-5086.2018.08.28.02

西南石油大学学报(自然科学版) ›› 2019, Vol. 41 ›› Issue (5): 127-133.DOI: 10.11885/j.issn.1674-5086.2018.08.28.02

页岩超临界态吸附气量计算模型

赵军¹, 刘凯¹, 杨林², 何羽飞²

1. 西南石油大学地球科学与技术学院, 四川成都 610500;
2. 中油集团测井有限公司评价中心, 陕西西安 710000

收稿日期:2018-08-28 出版日期:2019-10-10 发布日期:2019-10-10
通讯作者: 赵军,E-mail:zhaojun_70@126.com
作者简介:赵军,1970年生,男,汉族,四川盐亭人,教授,博士,主要从事测井解释与地质综合应用方面的研究工作。E-mail:zhaojun_70@126.com;刘凯,1994年生,男,汉族,四川成都人,硕士研究生,主要从事页岩气勘探开发方面的研究工作。E-mail:307800135@qq.com;杨林,1963年生,男,汉族,安徽肥东人,教授级高级工程师,主要从事油气测井评价方面工作。Email:yangl001@cnpc.com;何羽飞,1987年生,男,汉族,陕西西安人,工程师,主要从事非常规测井解释评价方面工作。E-mail:xsyuheyufei@163.com.com
基金资助:
国家科技重大专项（2017ZX05039002–002）

Calculation Model of Shale Gas Adsorption Capacity Under Supercritical Conditions

ZHAO Jun¹, LIU Kai¹, YANG Lin², HE Yufei²

1. School of Geosciences and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. Evaluation Center, Logging Co. Ltd., CNPC, Xi'an, Shaanxi 710000, China

Received:2018-08-28 Online:2019-10-10 Published:2019-10-10

摘要/Abstract

摘要： 页岩吸附气量是决定页岩气井开发价值和开发寿命的关键性参数，也是能否成功进行开发的重要参考因素。由于现有的适用于亚临界态的单分子层吸附的兰格缪尔等温吸附模型不适用于中国页岩气的储层条件，为此，通过不同温度下的等温吸附实验，拟合等温吸附曲线并分析影响页岩吸附能力的因素，发现影响页岩吸附能力的主要因素为地层温度和压力、孔隙度、有机质含量及成熟度、矿物组成及含量（其中以黏土矿物为直接影响因素）。以波拉尼吸附理论为基础，构建了考虑温度、压力、孔隙度、有机质含量及成熟度、矿物组成及含量的页岩吸附气定量计算模型。对比该模型的计算结果在整体趋势上与现场岩芯取样分析含气量结果基本一致。新模型考虑了超临界吸附，弥补了目前普遍采用的单层吸附模型的不足，对页岩吸附气量定量计算具有重要的现实意义。

关键词: 页岩气, 等温吸附, 波拉尼吸附理论, 超临界吸附, 定量计算

Abstract: Shale gas adsorption capacity is a key parameter in determining the development value and life of shale gas wells. The existing Langmuir isotherm adsorption model for the adsorption of monolayers is not suitable for the reservoir conditions of shale gas in China. Therefore, the main factors affecting shale gas adsorption capacity were studied by isothermal adsorption experiments at different temperatures and fitting of the isothermal adsorption curves. The analysis shows that the main factors are formation temperature and pressure, porosity, organic matter content and maturity, and mineral composition and content (including clay minerals as direct factors). Based on the Polanyi adsorption theory, a quantitative calculation model of shale gas adsorption that considers temperature, pressure, porosity, organic matter content and maturity, and mineral composition and content was constructed. The calculation results are consistent with the results of the analysis of gas content from on-site core sampling. The new model considers supercritical adsorption, which compensates for the shortcomings of the monolayer adsorption model that is currently in use, and has important practical significance for shale gas adsorption capacity calculation.

Key words: shale gas, isothermal adsorption, polanyi adsorption theory, supercritical adsorption, quantitative calculation

中图分类号:

赵军, 刘凯, 杨林, 何羽飞. 页岩超临界态吸附气量计算模型[J]. 西南石油大学学报(自然科学版), 2019, 41(5): 127-133.

ZHAO Jun, LIU Kai, YANG Lin, HE Yufei. Calculation Model of Shale Gas Adsorption Capacity Under Supercritical Conditions[J]. 西南石油大学学报(自然科学版), 2019, 41(5): 127-133.

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页岩超临界态吸附气量计算模型

Calculation Model of Shale Gas Adsorption Capacity Under Supercritical Conditions

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