高演化富有机质页岩地层条件下吸附气量计算新方法

doi:10.3969/j.issn.1006-6535.2023.02.010

特种油气藏 ›› 2023, Vol. 30 ›› Issue (2): 71-77.DOI: 10.3969/j.issn.1006-6535.2023.02.010

高演化富有机质页岩地层条件下吸附气量计算新方法

高雯璐^1,2, 周文^1,2, 徐浩², 周秋媚¹, 唐潮¹, 刘瑞崟¹, 蒋柯¹

1.成都理工大学,四川成都 610059;
2.成都理工大学油气藏地质及开发工程国家重点实验室,四川成都 610059

收稿日期:2022-08-31 修回日期:2022-12-15 出版日期:2023-04-25 发布日期:2023-05-29
通讯作者: 周文(1962—),男,教授,1983年毕业于成都地质学院石油地质专业,2006年毕业于成都理工大学油气田开发工程专业,获博士学位,现从事非常规油气地质研究与教学工作。
作者简介:高雯璐(1997—),女,2020年毕业于成都理工大学石油工程专业,现为该校地质资源与地质工程专业在读硕士研究生,从事开发地质、非常规油气地质研究。
基金资助:
国家自然科学基金“排烃作用对页岩孔隙控制作用与含气性影响研究”(41972137)、“海相高成熟页岩气储层微观气-水分布规律研究”(42002157);四川省科技计划 “四川盆地页岩气储层流体分布规律与地下吸游比研究”(2021YJ0349)、“川南海相深层多尺度页岩气藏流固耦合数值模拟动态研究”(2021JDRC0111)

A New Method for Calculating Adsorbed Gas Amount in Highly Evolved Shale Formations with Rich Organic Matters

Gao Wenlu^1,2, Zhou Wen^1,2, Xu Hao², Zhou Qiumei¹, Tang Chao¹, Liu Ruiyin¹, Jiang Ke¹

1. Chengdu University of Technology, Chengdu, Sichuan 610059, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China

Received:2022-08-31 Revised:2022-12-15 Online:2023-04-25 Published:2023-05-29

摘要/Abstract

摘要： 为获得高演化富有机质页岩地层条件下的准确吸附气量,选取川南龙马溪组高演化海相富有机质页岩样品,开展甲烷等温吸附与扫描电镜等实验,提出一种考虑地层含水条件下,不同吸附介质的吸附气量计算新方法。通过对有机质吸附分数进行校正,将地层条件下页岩所有孔隙表面的总吸附气量折算为仅在有机质孔隙表面吸附的有机质吸附气量。研究结果表明:由校正后的有机质吸附气量计算所得含气量与现场实测含气量基本一致,且随有机质含量的增加,有机质吸附气量与页岩总吸附气量间的差值逐渐减小,说明校正后的有机质吸附气量符合地层条件下高演化富有机质页岩实际的甲烷吸附模式。该方法可为页岩储层的地层条件下吸附气量计算提供依据。

关键词: 页岩气, 流体分布, 吸附气量, 有机孔隙, 含气量

Abstract: In order to work out the accurate amount of adsorbed gas in the highly evolved shale formation with rich organic matters, a new method was proposed to calculate the amount of adsorbed gas with different adsorption media considering formation water content after conducting isothermal methane adsorption and scanning electron microscopy experiments on highly evolved marine shale samples with rich organic matters from Longmaxi Formation, Southern Sichuan. Through the correction of organic matter adsorption fraction, the total amount of adsorbed gas on all pore surfaces of shale under stratigraphic conditions was converted into the amount of gas adsorbed by organic matters only on the organic matter pore surface. The results of the study show that the gas content calculated from the corrected amount of gas adsorbed by organic matters was basically consistent with the measured gas content on site. With the increase of organic matter content, the difference between the amount of gas adsorbed by organic matters and the total adsorbed gas amount of shale was decreased gradually, indicating that the corrected amount of gas absorbed by organic matters conforms to the actual methane adsorption model of the highly evolved shale formations with rich organic matters under stratigraphic conditions. This method can provide a basis for the calculation of adsorbed gas amount under the stratigraphic conditions of shale reservoirs.

Key words: shale gas, fluid distribution, amount of gas adsorbed, organic pore, gas content

中图分类号:

TE121

高雯璐, 周文, 徐浩, 周秋媚, 唐潮, 刘瑞崟, 蒋柯. 高演化富有机质页岩地层条件下吸附气量计算新方法[J]. 特种油气藏, 2023, 30(2): 71-77.

Gao Wenlu, Zhou Wen, Xu Hao, Zhou Qiumei, Tang Chao, Liu Ruiyin, Jiang Ke. A New Method for Calculating Adsorbed Gas Amount in Highly Evolved Shale Formations with Rich Organic Matters[J]. Special Oil & Gas Reservoirs, 2023, 30(2): 71-77.

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高演化富有机质页岩地层条件下吸附气量计算新方法

A New Method for Calculating Adsorbed Gas Amount in Highly Evolved Shale Formations with Rich Organic Matters

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