• 专家论坛 •

### 中美常压页岩气赋存状态及其对可动性与产量的影响——以彭水和阿巴拉契亚为例

1. 1. 构造与油气资源教育部重点实验室,湖北 武汉 430074
2. 中国地质大学（武汉）,湖北 武汉 430074
3. 中国石化西南油气分公司,四川 成都 610041
4. 中国石化华东油气分公司,江苏 南京 210019
• 收稿日期:2022-09-10 出版日期:2022-06-26 发布日期:2022-06-24
• 作者简介:蒋恕（1976—）,男,教授,博士研究生导师,构造与油气资源教育部重点实验室主任,学科首席,主要从事常规和非常规油气及地热勘探开发研究。地址：湖北省武汉市洪山区鲁磨路388号中国地质大学（武汉）,邮政编码：430074。E-mail: jiangsu@cug.edu.cn
• 基金资助:
国家自然科学基金重点项目“复杂构造带常压页岩气动态赋存机理与可动性研究”(42130803);国家自然科学基金面上项目“不同岩相页岩油与油页岩储层原位加热增孔致裂机理与预测”(42072174);中国石化华东油气分公司常压页岩气研究项目“川东南与美国常压页岩气对比及技术策略研究”(34600000-19-ZC0607-0004)

### Occurrence of normally-pressured shale gas in China and the United States and their effects on mobility and production: A case study of southeast Sichuan Basin and Appalachia Basin

JIANG Shu1,2(),LI Chun1,2,CHEN Guohui1,2,GUO Tonglou3,WU Yuyuan4,HE Xipeng4,GAO Yuqiao4,ZHANG Peixian4

1. 1. Key Laboratory of Tectonics and Petroleum Resources Ministry of Education, Wuhan, Hubei 430074, China
2. China University of Geosciences（Wuhan）, Wuhan, Hubei 430074, China
3. Sinopec Southwest Oil and Gas Company, Chengdu, Sichuan 610041, China
4. Sinopec Southwest Oil and Gas Company, Nanjing, Jiangsu 210019, China
• Received:2022-09-10 Online:2022-06-26 Published:2022-06-24

Abstract:

Normal pressure shale gas plays such as the Ohio Formation Shale and Marcellus Formation Shale in the Appalachian Basin in the U.S. have been developed commercially. Although Wufeng-Longmaxi Shale in southeast Sichuan Basin in China has been initially developed, its production efficiency is not obvious and its cost is high due to the large burial depth and poor reservoir properties physical properties. In the normal pressure shale gas formation, the absolute pressure changes at different depths, which influences the gas occurrence state, and then has a significant influence on gas content and mobility. Therefore, it is urgent to carry out quantitative research on the differences of normal pressure shale gas reservoir conditions, gas occurrence state, gas content and mobility between China and the US. In this study, the Wufeng-Longmaxi shales of Well-LY1 in Pengshui of China and the Marcellus shale and Ohio Shale of Appalachian Basin in the United States are selected as the research objects under normal pressure. Based on the volume method, and with the considering of the influence of the temperature, pressure, maturity, water and oil on the adsorption capability and maximum adsorption capacity, and the temperature and pressure, porosity and water saturation on the determination of free gas volume, the gas content of three groups of shale reservoirs is evaluated. The reservoir pressures are considered as the initial pressures and the simulation are conducted based on a pressure drop of 5 MPa. On the basis of clarifying the desorption process of adsorption and free gas in the depressurized production respectively, the fundamental cause of the difference in normal pressure shale gas production between China and the U.S. is revealed. Compared to the Marcellus Shale in Appalachian Basin, the lower adsorption capacity, porosity and free gas of the Wufeng-Longmaxi shales result in low production of adsorbed gas and free gas. However, compared to the shale of the Ohio Formation, the deeper burial, higher temperature and higher pressure in the Wufeng-Longmaxi shales result in the extremely low recovery rate of adsorbed gas. Its lower porosity also contributes to the lower free gas production.

• TE122