油气藏评价与开发 ›› 2026, Vol. 16 ›› Issue (1): 74-83.doi: 10.13809/j.cnki.cn32-1825/te.2025063

• 方法理论 • 上一篇    下一篇

碳酸盐岩气藏注CO2提高采收率与埋存潜力评价指标研究

赵梓寒1(), 彭先2, 王梦雨1, 周源1, 李隆新1, 罗瑜2, 徐世昊3, 汪永朝4, 任运波5, 熊伟3, 赵玉龙3, 曹成3()   

  1. 1.中国石油西南油气田分公司勘探开发研究院,四川 成都 610051
    2.中国石油西南油气田分公司勘探开发研究院,四川 成都 610041
    3.西南石油大学油气藏地质及开发工程全国重点实验室,四川 成都 610500
    4.四川省油气勘探 开发有限公司·四川资源集团,四川 成都 610000
    5.中国石油西南油气田公司华油公司,四川 成都 610066
  • 收稿日期:2025-02-10 发布日期:2026-01-06 出版日期:2026-01-26
  • 通讯作者: 曹成(1993—),男,博士,副研究员,主要从事二氧化碳利用与封存(CCUS)等领域的科研和教学工作。地址:四川省成都市新都区新都大道8号西南石油大学,邮政编码:610500。E-mail:caochengcn@163.com
  • 作者简介:赵梓寒(1990—),男,博士,高级工程师,主要从事包括缝洞型碳酸盐岩储气库地应力变化、CO2提高采收率及封存评价、气藏工程中人工智能技术的应用等研究。地址:成都市高新区天府大道北段12号,邮政编码:610051。E-mail:zzhan@petrochina.com.cn
  • 基金资助:
    国家自然科学基金区域创新联合基金重点项目“四川盆地有水气藏CO2驱提高采收率及其有效封存研究”(U23A2022);重庆市自然科学基金面上项目“多元杂质影响下CO2—地层水—泥岩作用机理及盖层封闭性演化机制”(CSTB2024NSCQ-MSX0951);四川省自然科学基金项目“深层海相碳酸盐岩气藏注CO2提高采收率协同碳封存机理研究”(2025ZNSFSC1357);油气藏地质及开发工程全国重点实验室开放基金项目“咸水层含杂质CO2—水—岩作用机制与封存潜力评价方法研究”(PLN2023-28)

Research on evaluation indicators for CO2-enhanced gas recovery and storage potential in carbonate gas reservoirs

ZHAO Zihan1(), PENG Xian2, WANG Mengyu1, ZHOU Yuan1, LI Longxin1, LUO Yu2, XU Shihao3, WANG Yongchao4, REN Yunbo5, XIONG Wei3, ZHAO Yulong3, CAO Cheng3()   

  1. 1.Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610051, China
    2.Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, China
    3.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    4.Sichuan Oil and Gas Exploration and Development Co. , LTD / Sichuan Resources Group, Chengdu, Sichuan 610000, China
    5.Sichuan Huayou Group Co. , Ltd. , PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610066, China
  • Received:2025-02-10 Online:2026-01-06 Published:2026-01-26

摘要:

碳酸盐岩气藏注二氧化碳(CO2)在提高甲烷(CH4)采收率的同时能够实现CO2的地质埋存。针对孔隙-裂缝型碳酸盐岩气藏流体渗流表征不准确的问题,采用PR(Peng-Robinson)状态方程计算流体物性,建立考虑对流与扩散的双孔双渗数值模型,分析裂缝渗透率、储层倾角、裂缝孔隙度、基质孔隙度、注气速度等因素对CH4采收率和CO2埋存量的影响规律。数值模拟结果表明:裂缝渗透率越高,早期CH4的产气量就越高,但CO2突破后,CH4产气量迅速下降;裂缝孔隙度和基质孔隙度的增加显著提高了CH4采收率与CO2埋存量;储层倾角增加,CH4采收率和CO2埋存量受重力分异影响也随之提高;注气速度越快,增压补能效果越显著,CH4与CO2产气量越高,CH4采收率和CO2埋存量下降;基质渗透率、注气时机及5% O2对提采与埋存的影响较小。基于数值模拟结果,采用变异系数法和专家赋权法确定影响因素权重,通过层次分析法构建了碳酸盐岩气藏注CO2提采与埋存的评价指标体系,并对WLH气藏的不同区块开展综合评价。综合评价结果表明,不同区块的储层物性差异显著,裂缝渗透率、裂缝孔隙度和储层倾角等指标的权重对评价结果有直接影响,但整体趋势与模型分析一致,验证了评价指标体系的有效性和正确性。研究成果为裂缝性碳酸盐岩气藏注CO2提高气藏采收率协同碳埋存提供了理论依据与有效的评价指标体系。

关键词: CCUS, 碳酸盐岩气藏, CO2提高采收率, 评价指标, 双孔双渗模型

Abstract:

Injecting carbon dioxide (CO2) into carbonate gas reservoirs can achieve the geological storage of CO2 while enhancing methane (CH4) recovery. To address the inaccurate characterization of fluid flow in fractured-vuggy carbonate gas reservoirs, the Peng-Robinson (PR) equation of state was used to calculate fluid properties, and a dual-porosity dual-permeability numerical model considering both convection and diffusion was established. This model was used to analyze the effects of factors including fracture permeability, reservoir dip angle, fracture porosity, matrix porosity, and gas injection rate on CH4 recovery and CO2 storage capacity. The numerical simulation results showed that higher fracture permeability led to higher CH4 production rates in the early stage, but the CH4 production rate declined rapidly after CO2 breakthrough. Increasing fracture porosity and matrix porosity significantly improved CH4 recovery and CO2 storage capacity. An increase in reservoir dip angle resulted in higher CH4 recovery and CO2 storage capacity due to gravity segregation effects. Higher gas injection rates resulted in more significant pressure maintenance and energy replenishment, leading to higher production rates of both CH4 and CO2 but causing a decrease in both CH4 recovery and CO2 storage capacity. Matrix permeability, injection timing, and the presence of 5% O2 had a relatively small impact on the enhancement of recovery and storage. Based on the numerical simulation results, the weights of the influencing factors were determined using the coefficient of variation method and expert weighting method. Then, an evaluation indicator system for CO2-enhanced recovery and storage in carbonate gas reservoirs was constructed using the analytic hierarchy process. A comprehensive evaluation was conducted on different blocks of the WLH gas reservoir. The comprehensive evaluation results showed that significant differences in reservoir physical properties were observed among different blocks, and the weights of indicators such as fracture permeability, fracture porosity, and reservoir dip angle directly affected the evaluation results. However, the overall trend was consistent with the model analysis, confirming the effectiveness and accuracy of the evaluation indicator system. The findings provide a theoretical basis and an effective evaluation indicator system for CO2-enhanced gas recovery and carbon storage in fractured carbonate gas reservoirs.

Key words: CCUS, carbonate gas reservoir, CO2-enhanced gas recovery, evaluation indicators, dual-porosity dual-permeability model

中图分类号: 

  • TE377