【作者】 戚宇； 韦重韬； 李来成； 孙义敏； 王克营；

【Author】 Qi Yu~(1,2) Wei Chongtao~(1,2) Li Laicheng~1 Sun Yimin~(1,2) Wang Keying~(1,2) (1.School of Resource & Geoscience,China University of Mining & Technology,Xuzhou,Jiangsu,China 221116; 2.Key Laboratory of Coalbed Methane Resource & Reservoir Formation Process,Ministry of Education,Xuzhou,Jiangsu,China,221008)

【机构】 中国矿业大学资源与地球科学学院； 中国矿业大学煤层气资源与成藏过程教育部重点实验室；

【摘要】 分析认为,单一含煤层气系统因其内部存在渗透性通道而引起的侧向散失作用是将其转变为多层叠置含煤层气系统的根本原因。据此建立了多层叠置含煤层气系统形成的侧向散失地质模型和数学模型,运用数值模拟方法研究了水公河向斜多层叠置含煤层气系统的形成演化过程。结果表明,研究区煤层气成藏过程分可为5个阶段,即浅埋—未成熟阶段、深埋—初期成藏阶段、早期抬升—散失阶段、二次成熟—成藏活跃阶段和散失-多层叠置含煤层气系统发育阶段。从早白垩世末开始,因地层差异抬升,水公河向斜逐渐形成,侧向通道散失作用发生导致多层叠置含煤层气系统开始发育;多层叠置含煤层气系统显现程度先增强后减弱,在距今69Ma时最为强烈;侧向通道散失作用与"均一化"作用动态变化与耦合叠加控制了多层叠置含煤层气系统的显现程度。更多还原

【Abstract】 The mechanism of the transformation of a single coalbed methane system to multiple superposed coalbed methane(MSCBMS) is that there are sandstone passages with good permeability which can lead to lateral dissipation. The geologic and numerical models of the lateral dissipation in MSCBMS were constructed to study the formation and evolution process of MSCBMS in Shuigonghe Syncline.The modeling results indicated that the CBM reservoir process can be divided into five stages,which are shallow burial(immature stage),deep burial(the primary stage of CBM reservoir formation),early uplift(dissipation stage),secondary maturation(active stage of CBM reservoir formation) and uplift-dissipation(development of the multiple superposed CBM system,or MSCBMS).From the end of Early Cretaceous,Shuigonghe Syncline shaped up gradually because of the differential uplift,which caused the development of lateral dissipation and led to the formation of MSCBMS.The visualization of MSCBMS was different along with the time,and it was most obvious before 69 Ma.The lateral dissipation,the dynamic transformation of homogenization,and the coupling superposition controlled the visualization degree of MSCBMS.更多还原