Characteristics of supercritical adsorption and desorption of deep shale gas in South Sichuan

YANG Jian; ZHAN Guowei; ZHAO Yong; REN Chunyu; QU Chongjiu

doi:10.13809/j.cnki.cn32-1825/te.2021.02.006

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Characteristics of supercritical adsorption and desorption of deep shale gas in South Sichuan

更新时间：2025-07-10

- Characteristics of supercritical adsorption and desorption of deep shale gas in South Sichuan
- Petroleum Reservoir Evaluation and Development Issue 2, Pages: 50-55+62(2021)
- 作者机构：
  
  1. 中国石化西南油气分公司勘探开发研究院
  2. 中国石油大学(北京)油气资源与探测国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13809/j.cnki.cn32-1825/te.2021.02.006
  CLC： P618.13
- Published：2021
- 稿件说明：
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[1]杨建,詹国卫,赵勇,任春昱,屈重玖.川南深层页岩气超临界吸附解吸附特征研究[J].油气藏评价与开发,2021,11(02):50-55+62.

YANG Jian, ZHAN Guowei, ZHAO Yong, et al. Characteristics of supercritical adsorption and desorption of deep shale gas in South Sichuan[J]. Petroleum Reservoir Evaluation and Development, 2021, (2): 50-55+62.
[1]杨建,詹国卫,赵勇,任春昱,屈重玖.川南深层页岩气超临界吸附解吸附特征研究[J].油气藏评价与开发,2021,11(02):50-55+62. DOI： 10.13809/j.cnki.cn32-1825/te.2021.02.006.

YANG Jian, ZHAN Guowei, ZHAO Yong, et al. Characteristics of supercritical adsorption and desorption of deep shale gas in South Sichuan[J]. Petroleum Reservoir Evaluation and Development, 2021, (2): 50-55+62. DOI： 10.13809/j.cnki.cn32-1825/te.2021.02.006.

摘要

页岩气吸附量主要受埋深、矿物成分、温度、压力等因素的影响

川南页岩气具有埋深大、高温、高压的特点

明确这类页岩储层超临界状态的吸附解吸附特征对于落实气藏储产量意义重大。综合采用室内物理模拟实验和分子动力学模拟相结合的方法

构建并优选了伊利石+干酪根复合表征模型

拓展建立了川南深层页岩气全域吸附量多元预测模型

明确了气藏的吸附解吸附特征。实验分析结果表明:随着地层压力的增加

吸附量逐渐增加

压力高于15 MPa后吸附量增幅逐步变缓;气藏原始条件下吸附气量占总气量体积的20%～25%;地层压力降至20 MPa时自由气采出程度约70%～90%

吸附气采出程度约25%～40%。

Abstract

The adsorption capacity of shale gas is mainly influenced by the factors such as burial depth

mineral composition

temperature and pressure.The shale gas in South Sichuan has the characteristics of large buried depth

high temperature and high pressure.It has great significance to determine the adsorption and desorption characteristics of this kind of shale reservoir in supercritical state for the implementation of gas reservoir production.By the combination of indoor physical simulation experiments and molecular dynamics simulation

the composite characterization model of Illite and Kerogen is constructed and optimized

the multiple prediction model of "whole area adsorption capacity of the deep shale gas in South Sichuan is developed

and the adsorption and desorption characteristics of the gas reservoir are clarified.The experimental results show that:with the increase of formation pressure

the adsorption capacity increases gradually

and when the pressure is higher than 15 MPa

the increase of adsorption capacity gradually slows down.Under the original conditions of gas reservoir

the adsorbed gas volume accounts for 20%～25% of the total gas volume.When the formation pressure drops to 20 MPa

the recovery degree of free gas is about 70%～90%

and the recovery degree of adsorbed gas is about 25%～40%.

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