蒋志斌,祁丽莎,陈伟,王杰,余贝贝,谢丹
Jiang Zhibin,Qi Lisha,Chen Wei,Wang Jie,Yu Beibei,Xie Dan

• 1:国家管网集团工程技术创新有限公司
• 2:中国石油新疆油田公司勘探开发研究院

摘要(Abstract)：

超低渗透砾岩油藏因储层致密、水驱开发效果差，注气驱成为提高采收率的重要手段。储层内部的隔夹层对气体注入过程中的突破行为具有关键控制作用，直接影响注气效果。为明确砾岩隔夹层的注气突破规律，系统开展了隔夹层岩石学、孔喉结构及阻隔性实验研究。采用X射线衍射（XRD）、扫描电镜（SEM）等手段对隔夹层岩性与孔喉结构进行定量表征，结合岩心注气突破实验与数字岩心孔隙网络模拟，建立突破压力与渗透率之间的函数关系。结果表明，研究区隔夹层主要为含泥细-中砾岩、凝灰质砾岩，平均孔隙度为6.1%，渗透率为0.004 3×10~(-3)μm~2，突破压力与渗透率呈负对数线性关系。结合油藏注气极限压差条件，明确了气体突破的渗透率下限为0.003×10~(-3)μm~2。研究成果为砾岩储层注气开发中隔夹层有效识别及注气参数优化提供了理论依据与技术支撑。
Due to the tight reservoir and the poor water-flooding development effect, gas injection has become an important method for enhancing oil recovery in ultra-low permeability conglomerate reservoirs. Interlayers within the reservoir play a critical role in controlling gas breakthrough behavior during injection process, directly affecting gas, injection efficiency. To clarify gas breakthrough mechanisms in conglomerate interlayers systematic studies are conducted on petrology, pore-throat structure and sealing properties through experiments. Quantitative characterization of lithology and pore structures is conducted using X-ray diffraction(XRD) and scanning electron microscope(SEM). Combined with core-based gas breakthrough experiments and digital rock pore network modeling, a functional relationship between breakthrough pressure and permeability is established. The results show that, interlayers in studied area are mainly composed of argillaceous fine-medium conglomerates and tuffaceous conglomerates, with an average porosity of 6.1% and permeability of 0.004 3×10~(-3) μm~2. Breakthrough pressure exhibits a negative logarithmic linear relationship with permeability. Based on reservoir gas injection pressure differential limits, the lower permeability limit for gas breakthrough is determined to be 0.003×10~(-3) μm~2 The research provides a theoretical basis and technical support for effective interlayer identification and parameters optimization in gas injection development of conglomerate reservoirs.

关键词(KeyWords)： 砾岩;隔夹层;注气突破规律;突破压力;渗透率;孔隙度
conglomerate;interlayer;gas injection breakthrough mechanisms;breakthrough pressure;permeability;porosity

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司重大科技专项“CCUS驱油地质体精细描述及油藏工程关键技术研究”（2021ZZ01-03）;; 新疆油田公司科技专项“准噶尔超级盆地CCUS/CCS全产业链关键技术研究”（2024XJZX08）

作者(Author): 蒋志斌,祁丽莎,陈伟,王杰,余贝贝,谢丹
Jiang Zhibin,Qi Lisha,Chen Wei,Wang Jie,Yu Beibei,Xie Dan

DOI: 10.19597/J.ISSN.1000-3754.202505028

参考文献(References)：

• [1]袁士义，王强，李军诗，等.注气提高采收率技术进展及前景展望[J].石油学报，2020,41(12):1623-1632.Yuan Shiyi,Wang Qiang,Li Junshi,et al. Technology progress and prospects of enhanced oil recovery by gas injection[J]. Acta Petrolei Sinica, 2020,41(12):1623-1632.
• [2]叶文卓.巨厚块状油藏顶部注气稳定重力驱油藏工程设计[D].北京：中国石油大学（北京），2020.Ye Wenzhuo. Reservoir engineering design of stable gravity drainage by top gas injection in massive thick reservoirs[D].Beijing:China University of Petroleum(Beijing),2020.
• [3]冯科文，穆朗枫，阎逸群，等.气体辅助重力驱提高采收率数值模拟[J].大庆石油地质与开发，2020,39(4):77-86.Feng Kewen,Mu Langfeng,Yan Yiqun,et al. Numerical simulation of the enhanced oil recovery by gas-assisted gravity drainage(GAGD)[J]. Petroleum Geology&Oilfield Development in Daqing,2020,39(4):77-86.
• [4]胡文瑄，陆现彩，范明，等.泥页岩盖层研究进展：类型，微孔特征与封盖机理[J].矿物岩石地球化学通报，2019,38(5):885-896.Hu Wenxuan,Lu Xiancai,Fan Ming,et al. Advances in the research of shale caprocks:type, micropore characteristics and sealing mechanisms[J].Bulletin of Mineralogy,Petrology and Geochemistry,2019,38(5):885-896.
• [5]付晓飞，吴桐，吕延防，等.油气藏盖层封闭性研究现状及未来发展趋势[J].石油与天然气地质，2018,39(3):454-471.Fu Xiaofei,Wu Tong,LüYanfang,et al. Research status and development trend of the reservoir caprock sealing properties[J]. Oil&Gas Geology,2018,39(3):454-471.
• [6]娄敏，杨香华，尤丽，等.影响泥岩盖层质量的主要因素及评价新思路[J].成都理工大学学报（自然科学版），2021,48(1):82-93.Lou Min,Yang Xianghua,You Li,et al. The main factors affecting the quality of mudstone caprock and a new idea for its evaluation[J]. Journal of Chengdu University of Technology(Science&Technology Edition),2021,48(1):82-93.
• [7]朱焕来，王卫学，付广，等.改进的砂泥岩地层中断裂封闭性评价SGR法及应用[J].特种油气藏，2024,31(4):89-95.Zhu Huanlai, Wang Weixue, Fu Guang, et al. The advanced SGR method for fracture closure evaluation in arenaceous shale formation and its application[J]. Special Oil&Gas Reservoirs,2024,31(4):89-95.
• [8]Jin Zhijun,Yuan Yusong,Sun Dongsheng,et al. Models for dynamic evaluation of mudstone/shale cap rocks and their applications in the Lower Paleozoic sequences,Sichuan Basin,SW China[J]. Marine and Petroleum Geology,2014,49:121-128.
• [9]范坤，朱文卿，周代余，等.隔夹层对巨厚砂岩油藏注气开发的影响：以塔里木盆地东河1油田石炭系油藏为例[J].石油学报，2015,36(4):475-481.Fan Kun, Zhu Wenqing, Zhou Daiyu, et al. Effect of interlayers in thick sandstone reservoir for gas injection:a case study of Donghe 1 Carboniferous oil reservoir in Tarim Basin[J]. Acta Petrolei Sinica,2015,36(4):475-481.
• [10]Dahle H K, Celia M A, Hassanizadeh S M. Bundle-of-tubes model for calculating dynamic effects in the capillary-pressure-saturation relationship[J].Transport in Porous Media,2005,58(1-2):5-22.
• [11]Zhao Weihang,Ma Shaokun,Yang Ruifeng,et al. Prediction of self-sealing efficiency of caprock in long term geological CO2 storage based on GA-BP neural network and numerical method[J].Energy Reports,2025,13:3504-3521.
• [12]Chen Bowen,Li Qi,Tan Yongsheng,et al. Experimental measurements and characterization models of caprock breakthrough pressure for CO2 geological storage[J]. Earth-Science Reviews,2024,252:104732.
• [13]Yuan Xiuquan,Dong Wenxin,Fan Jinyang,et al. Dynamic gas emission during coal seam drilling under the thermo-hydro-mechanical coupling effect:a theoretical model and numerical simulations[J]. Gas Science and Engineering, 2024, 131:205454.
• [14]Mostafa A, Scholtès L, Golfier F. Pore-scale hydro-mechanical modeling of gas transport in coal matrix[J]. Fuel,2023,345:128165.
• [15]Wang Ziwei,Qin Yong,Li Teng,et al. A numerical investigation of gas flow behavior in two-layered coal seams considering interlayer interference and heterogeneity[J]. International Journal of Mining Science and Technology,2021,31(4):699-716.
• [16]陈博文，王锐，李琦，等. CO2地质封存盖层密闭性研究现状与进展[J].高校地质学报，2023,29(1):85-99.Chen Bowen,Wang Rui,Li Qi,et al. Status and advances of research on caprock sealing properties of CO2 geological storage[J]. Geological Journal of China Universities,2023,29(1):85-99.
• [17]SY/T 5163—2018沉积岩中黏土矿物和常见非黏土矿物X射线衍射分析方法[S].SY/T 5163-2018 Method for X-ray diffraction analysis of clay minerals and common non-clay minerals in sedimentary rocks[S].
• [18]SY/T 5162—2021岩石样品扫描电子显微镜分析方法[S].SY/T 5162-2021Method for scanning electron microscope analysis of rock samples[S].
• [19]刘林，桑琴，曹建，等.枯竭气藏改建储气库盖层封闭能力综合评价：以川西北中坝气田须二气藏为例[J].大庆石油地质与开发，2022,41(6):42-50.Liu Lin,Sang Qin,Cao Jian,et al. Comprehensive evaluation of sealing capacity of depleted gas reservoir reconstructed to gas storage:a case study of Xu 2 gas reservoir in Zhongba Gas Field,northwest Sichuan[J]. Petroleum Geology&Oilfield Development in Daqing,2022,41(6):42-50.
• [20]Zhang Fan,Jiang Zhenxue,Zhang Yuanhao,et al. A new method for converting T 2 spectrum into pore radius[J]. Journal of Earth Science,2023,34(4):966-974.
• [21]SY/T 5748—2020岩石气体突破压力测定方法[S].SY/T 5748-2020 Determination method of gas breakthrough pressure in rock[S].
• [22]吕伟峰. CT在油田开发实验中的应用[M].北京：石油工业出版社，2020.LüWeifeng. Application of CT technology in oilfield development experiments[M]. Beijing:Petroleum Industry Press,2020.
• [23]Dahle H K,Celia M A. A dynamic network model for two-phase immiscible flow[J]. Computational Geosciences, 1999, 3(1):1-22.
• [24]Zhao Wei,Dong Huzi,Yuan Yuan,et al. Evolution law of coal and gas outburst hole shapes with varying underground stress conditions:numerical analysis and on-scene evidence[J]. Fuel,2024,360:130531.