Quantitative criteria for identifying main flow channels in complex porous media

• 作者: GUAN Chunxiao GUO Hui HU Yong LI Xizhe LIU Xiaohua LU Detang LUO Ruilan QI Yadong SHEN Weijun SUN Yuping
• 来源期刊: 石油勘探与开发:英文版
• 学科: 工学
• 关键词: porous media matrix PORE fracture FLOW CHANNELS main FLOW channel index QUANTITATIVE identification CRITERIA
• 年，卷（期）: 2019,（5）
• 页码范围: 998-1005
• 页数: 8页
• 分类号: TE31

摘要

To identify the type of main flow channels of complex porous media in oil and gas reservoirs,the"main flow channel index"is defined as the ratio of comprehensive permeability obtained from well test to matrix permeability obtained from core analysis or well logging.Meanwhile,a mathematical model is established based on equivalent flow assumption,the classification method for main flow channels is put forward,and quantitative characterization of main flow channels is realized.The method has been verified by analysis of typical gas reservoirs.The study results show that the"main flow channel index"can quantitatively classify types of flow channels.If the index is less than 3,the matrix pore is the main flow channel;if the index is between 3 and 20,the fracture is the main flow channel and the matrix pore acts as the supplement one;if the index is more than 20,the fracture is the only seepage channel.The dynamic analysis of typical gas reservoirs shows that the"main flow channel index"can be used to identify the type of flow channel in complex porous media,guiding the classified development of gas reservoirs,and avoiding development risk.