深层陆相页岩渗透性演变的温压耦合实验与响应机制

康志勤; 王嘉伟; 王磊; 李伟; 杨栋; 赵静; 俞凌杰; 赵阳升; 杨小明; 任思齐

doi:10.11698/PED.20250117

石油勘探与开发 >

0 20251205 - 20251205

DOI: https://doi.org/10.11698/PED.20250117

深层陆相页岩渗透性演变的温压耦合实验与响应机制

康志勤 ,
王嘉伟 ,
王磊 ,
李伟 ,
杨栋 ,
赵静 ,
俞凌杰 ,
赵阳升 ,
杨小明 ,
任思齐

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1.太原理工大学原位改性采矿教育部重点实验室,太原 030024;
2.太原理工大学国家油页岩开采研发中心原位注蒸汽分中心,太原 030024;
3.东北石油大学环渤海能源研究院,河北秦皇岛 066099;
4.中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡 214126;
5.山西蒲县蛤蟆沟煤业有限公司, 山西临汾 041200

康志勤（1981-）,男,山西柳林人,博士,太原理工大学副教授,主要从事多孔介质多场耦合理论与技术研究。地址：山西省太原市万柏林区新矿院路太原理工大学虎峪校区,邮政编码：030024。E-mail：kangzhiqin810101@126.com

收稿日期: 2025-03-04

修回日期: 2025-11-16

网络出版日期: 2025-11-18

基金资助

国家自然科学基金（U23B2088）; 国家重点研发计划（2019YFA0705501）; 中央引导地方科技发展资金项目（YDZJSX20231A013）

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Temperature-pressure coupled experiments and response mechanisms of permeability evolution in deep continental shale

KANG Zhiqin ,
WANG Jiawei ,
WANG Lei ,
LI Wei ,
YANG Dong ,
ZHAO Jing ,
YU Lingjie ,
ZHAO Yangsheng ,
YANG Xiaoming ,
REN Siqi

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1. Key Laboratory of In-situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;
2. The In-situ Steam Injection Branch of State Center for Research and Development of Oil Shale Exploitation, Taiyuan University of Technology, Taiyuan 030024, China;
3. Bohai Rim Energy Research Institute, Northeast Petroleum University, Qinhuangdao 066099, China;
4. Wuxi Petroleum Geology Institute, Sinopec Exploration & Production Research Institute, Wuxi 214126, China;
5. Shanxi Puxian Hamagou Coal Industry Co., Ltd., Linfen 041200, China

Received date: 2025-03-04

Revised date: 2025-11-16

Online published: 2025-11-18

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摘要

基于自主研制的岩石高应力固-流-热耦合渗透实验系统以及岩石在线THMC-CT耦合试验系统,采用多尺度研究手段和方法,对深层陆相页岩高温-高应力耦合作用下渗透率变化规律、原位高温条件下孔缝定量表征及动态演化过程、页岩渗透率、热解产油及孔缝结构宏微观响应的演化机理进行研究。结果表明：①陆相页岩温压耦合提升作用下渗透率演变具有明显的三阶段特征,分别是低渗透率阶段（25~350 ℃）、渗透率快速增加阶段（350~450 ℃）和渗透率降低阶段（450~600 ℃）。②在原位恒定应力、升温作用下陆相页岩裂缝表现为两次扩展（25~300 ℃、350~450 ℃）与两次收缩（300~350 ℃、450~550 ℃）的动态演化特征,验证了渗透率演化的三阶段特征。升温条件下渗透率的主要响应机制为：①温度350 ℃时,滞留油中不易流动的重质液态烃充填孔缝,导致渗透性变差。②350~450 ℃温度范围,热破裂、有机质热解促使不同尺度孔缝的数量、张开度及连通性迅速提高,渗透率大幅度增加。③温度高于450 ℃,黏土矿物伊利石化造成基质松软坍塌,岩石骨架由脆性变形转化为塑性变形,表现为渗透率明显降低。研究成果有望为页岩油地下原位转化与商业开发提供重要的理论依据和工程技术参数。

关键词： 深部陆相页岩; 页岩油; 原位改置; 高温高压; 渗透率; 实时CT扫描; 响应机制

本文引用格式

康志勤 , 王嘉伟 , 王磊 , 李伟 , 杨栋 , 赵静 , 俞凌杰 , 赵阳升 , 杨小明 , 任思齐 . 深层陆相页岩渗透性演变的温压耦合实验与响应机制[J]. 石油勘探与开发, 0 : 20251205 -20251205 . DOI: 10.11698/PED.20250117

Abstract

Based on the self-developed high-stress solid-fluid-thermal coupling permeability experimental system and the in-situ rock THMC-CT coupling testing system, multi-scale research approaches were employed to investigate the permeability evolution of deep continental shale under coupled high-temperature and high-stress conditions, the quantitative characterization and dynamic evolution of pore-fracture structures under in-situ high-temperature environments, and the evolutionary mechanisms governing the macro-micro responses of shale permeability, thermal oil generation, and pore-fracture structures. The results show that: (1) The permeability evolution of continental shale under thermo-pressure coupling exhibits distinct three-stage characteristics: the low permeability stage (25-350 ℃), the rapid permeability increase stage (350-450 ℃), and the permeability decline stage (450-600 ℃). (2) Under in-situ constant stress and elevated temperature conditions, the fractures in continental shale undergo two expansion phases (25-300 ℃, 350-450 ℃) and two closure phases (300-350 ℃, 450-550 ℃), following a dynamic evolution pattern. The three-stage permeability evolution under thermo- pressure coupling in continental shale was validated. The main response mechanisms are as follows: (1) At 350 ℃, the permeability decreases due to the filling of pores and fractures by heavy, immobile liquid hydrocarbons retained within the rock. (2) In the temperature range of 350 ℃ to 450 ℃, thermal fracturing and the pyrolysis of organic matter significantly increase the number, aperture, and connectivity of pores and fractures at different scales, leading to a substantial enhancement in permeability. (3) At temperatures above 450 ℃, illitization of clay minerals causes the collapse of the rock framework. As a result, the rock deformation transitions from brittle to plastic behavior, leading to a marked decrease in permeability. The research findings provide important theoretical foundations and engineering technological parameters for commercial development of underground in-situ shale oil conversion.

Key words： deep continental shale; shale oil; in-situ modification; high temperature and high pressure; permeability; real-time CT scanning; response mechanism

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