华北盆地石炭纪—二叠纪煤与煤层气耦合成矿-成藏规律  

Coal and Coalbed Methane Coupling Metallogenic Accumulation Formative Law of Carboniferous-Permian North China Basin

作　　者：程爱国 郭爱军 陈美英 孙杰 龚汉宏 Cheng Aiguo;Guo Aijun;Chen Meiying;Sun Jie;Gong Hanhong(General Prospecting Institute,CNACG,Beijing 100039)

机构地区：[1]中国煤炭地质总局勘查研究总院,北京100039

出　　处：《中国煤炭地质》2022年第10期1-8,共8页Coal Geology of China

基　　金：中国地质调查局项目“全国矿产资源潜力评价”,中国地质调查局项目“中国矿产地质志”(DD20221695)。

摘　　要：煤的聚积、变质成矿的过程也是煤层气储集和成藏过程,存在密切的耦合关系。华北盆地石炭纪—二叠纪聚煤作用表现为垂向上富煤单元的周期性分布和横向上富煤带由北而南迁移,富煤带分布是富气带形成的基础。煤级分布与煤层含气量、资源丰度具有显著的耦合关系,高煤阶煤分布区往往也是煤层含气量大和高丰度资源分布区。华北煤系变形呈环带状,外环带发育逆冲推覆构造;弱挤压中环带多为推覆-褶皱构造样式;内部稳定区构造变形较弱,多为大型坳陷型和断坳型构造样式。华北东部活动区构造以多次反转的伸展断陷、裂陷控煤构造为特点。坳陷型、断坳型、推覆褶皱型、伸展断陷型煤与煤层气成矿耦合成矿成藏类型,坳陷型、断坳型煤层含气性好,资源丰富;推覆褶皱型煤层含气性中等,变化大;伸展断陷型煤层气大量逸散,含气量低,资源贫乏,多因素的系统和耦合作用,构成了华北煤与煤层气耦合成矿成藏模式。The process of coal accumulation,metamorphism and mineralization is also the process of coalbed methane metallogenic accumulation,which has close coupling relationship.The Carboniferous-Permian coal accumulation in North China Basin is characterized by the periodic distribution of the vertical coal-rich units and the horizontal migration of the upward coal belt from north to south,and the distribution of coal belt is the basis of the formation of gas-rich belt.There is a significant coupling relationship between coal rank distribution and gas bearing of coal seam and resource abundance.The distribution area of high rank coal is also the distribution area of high gas content of coal seam and high abundance coal resources;the deformation of coal bearing strata in North China is circular belt,and reversed nappe structure is developed in the outer ring belt;the central rign belt of weak extrusion is mostly reversed nappe fold structural style;the structure deformation in the internal stable area is slightly,most of them are large-scale depression type and fault depression type;the structure of the active area in the east part of North China is characterized by extensional fault depression and rift depression coal controlling structure with multiple reversals.Depression type,fault depression type,nappe fold type,extensional fault depression type coal and coalbed methane mineralization are coupled to form metallogenic accumulation types.the depression-type and fault-depression-type coal seams have good gas-bearing capacity,rich resources;the gas-bearing property of nappe-fold-type coal seam is medium and changes greatly;the coal-bed methane of extensional-faulted-depression-type is widely escaped,with low gas bearing and poor resources,the system and coupling effect of multi-factors constitute the coupling metallogenic accumulation and reservoir-forming model of coal and coalbed methane in North China Basin.

关 键 词：耦合成矿-成藏 煤炭和煤层气 华北盆地 

分 类 号：P618.11[天文地球—矿床学]