贵州大河边区块煤系气合采数值模拟与开发效果评价  

Numerical simulation and development effect evaluation of coal-measure gas co-production in Dahebian block of Guizhou Province

作　　者：王文楷 刘世奇[2,3] 梁渝 杜瑞斌 WANG Wenkai;LIU Shiqi;LIANG Yu;DU Ruibin(School of Mineral Resource and Geoscience,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization,China University of Mining and Technology,Xuzhou,Jiangsu 221008,China;Carbon Neutrality Institute,China University of Mining and Technology,Xuzhou,Jiangsu 2210o8,China;Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process,Ministry of Education,China University of Mining and Technology,Xuzhou,Jiangsu 221008,China)

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]中国矿业大学江苏省煤基温室气体减排与资源化利用重点实验室,江苏徐州221008 [3]中国矿业大学碳中和研究院,江苏徐州221008 [4]中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州221008

出　　处：《中国矿业大学学报》2025年第1期98-114,共17页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(42030810,41972168);中央高校基本科研业务费项目(2023KYJD1001)。

摘　　要：煤系气具有共生共储、多岩性储层频繁互层等特点,多层合采是实现其高效开发的有效方式.以黔西地区大河边区块二叠系上统龙潭组煤系叠合型储层为研究对象,开展了典型煤层-砂岩-泥岩互层型煤系叠合型气藏生产数值模拟研究,探讨了不同开发层段下煤系气井合采效果,阐明了非煤层段产气贡献、压力传导和渗透率动态变化对煤系气开发效果的影响,并提出研究区煤系气合层排采建议.结果表明:煤系气井合采效果受气源供给、地层压力传导方式以及储层物性动态变化影响.非煤层段(泥岩、砂岩)作为补充性气源对煤系气井产气量有一定贡献,其中“煤层+顶板+底板”开发方式的合采效果最佳,累计产气量增幅达2.97%~48.46%,非煤层段的产气贡献率可达5.3%~10.4%.非煤层段的产气贡献率受控于地层压力传导方式.层间垂向压差影响下,地层压降由泥岩、砂岩的高压力区向煤层的低压力区传导,控制了层间物质传递.多层段开发可减缓层间垂向压力传导,有利于储层内部压力的扩展和下降,而过多的开发层段,反而造成层间垂向压差增大,抑制了储层内部压降扩展,指示了煤系气开发应结合含气系统储层性质,优选适宜的开发层段.泥岩、砂岩渗透率的动态变化受开发方式的显著影响.多层合采的开发方式有利于煤层渗透率恢复,但易导致泥岩、砂岩渗透率快速下降,通过合理的排采管控工艺降低甚至避免泥岩、砂岩储层伤害也尤为重要.Coal measure gas has the characteristics of symbiotic co-storage and frequent inter-bedding of multi-lithologic reservoirs.Multi-layer commingled production is an effective way to achieve its efficient development.Taking the coal measure superimposed reservoir of the Upper Permian Longtan Formation in the Dahebian block of western Guizhou as the research object,the numerical simulation of the production of typical coal measure superimposed gas reservoirs with coal seam-sandstone-mudstone interbeds was carried out.The combined production effect of coal measure gas wells under different development intervals was discussed.The effects of gas production contribution,pressure conduction,and dynamic change of permeability on the development effect of coal measure gas were clarified,and the suggestions for the combined layer drainage of coal measure gas in the study area were put forward.The results show that the combined production effect of coal-bearing gas wells is affected by gas source supply,formation pressure conduction mode,and dynamic changes in reservoir physical properties.As a supplementary gas source,the non-coal seam section(mudstone and sandstone)has a certain contribution to the gas production of gas wells in coal measures.Among them,the combined mining effect of‘coal seam+roof+floor'development mode is the best,and the cumulative gas production increases by 2.97%~48.46%,and the gas production contribution rate of non-coal seam section can reach 5.3%~10.4%.The gas production contribution rate of the non-coal seam section is controlled by the formation pressure conduction mode.Under the influence of vertical pressure difference between layers,the formation pressure drop is transmitted from the high-pressure zone of mudstone and sandstone to the low-pressure zone of coal seam,which controls the material transfer between layers.The development of multi-layer sections can slow down the vertical pressure conduction between layers,which is conducive to the expansion and decline of the internal pressure of th

关 键 词：煤系气 多层合采 压力传导 渗透率 大河边区块 

分 类 号：P618.13[天文地球—矿床学]