Advances and prospects of design optimization technologies for differential development with three-dimensional well patterns for deep coalbed methane reservoirs: A case study of the No. 8 coal seam in the Ordos Basin

作者：Xia YAN, Jianlong Fang, Chun MOU, Peilong Meng, Yuan WANG, Xiang YU, Shixiang Fei, Yanqing FENG, Zhao Longmei, Meng LI, Yuehua Cui, Runlong Chi, Qing YANG, Li HUANG, Xiaopeng ZHENG, Zesong Yin, Congcong WANG, Limin MA, Shuang ZHANG, Shirui Liu, Yang ZHANG, Jiali GUO · 发表于：DOAJ (DOAJ: Directory of Open Access Journals) · 年份：2026 · DOI：10.12363/issn.1001-1986.26.04.0228 · 研究领域：Coal Properties and Utilization、Hydrocarbon exploration and reservoir analysis、Mining and Gasification Technologies

Objective Design optimization for gas reservoir development serves as a key approach to the efficient exploitation, enhanced primary recovery, and elevated efficiency with reduced costs of deep coalbed methane (CBM). MethodsIn this study, the most extensively developed Ordos Basin in China was investigated as an example to explore the significant heterogeneity of the geological conditions of deep coal seams. Based on a fine-scale geological investigation of over 3 000 wells across the basin, this study systematically revealed the heterogeneity of the key parameters of deep coal reservoirs, including reservoir distribution, reservoir-cap rock assemblages, coal seam structure, and gas-bearing properties. Accordingly, design optimization technologies for differential gas reservoir development with three-dimensional well patterns were presented. AdvancesThe results indicate that the No. 8 coal seam in the Ordos Basin exhibits thicknesses ranging from 6 m to 8 m and a continuous distribution. The coal seam is thick and shallowly buried in the east, while proving thin and deeply buried in the west. It remains intact in the northeast but bifurcates in the central part. It shows structures with distinct zonation, dominated by integrated coals (50%–70%) in the northeast and by coals with a single interlayer (50%) in the central part. Three types of reservoir-cap rock assemblages are identified in the No. 8 coal seam: coal-limestone, coal-mudstone, and coal-sandstone assemblages, with ...