陕西省富油煤资源潜力及开发建议

Potential of oil-rich coal resources in Shaanxi Province and its new development suggestion

碳达峰、碳中和目标要求下,陕西作为煤炭资源大省,煤炭资源的低碳开发与利用势在必行。基于陕西五大煤田的5000余组煤质数据,研究陕西省煤炭资源中煤焦油产率的变化规律为:陕北三叠纪煤田>陕北侏罗纪煤田>陕北石炭–二叠纪煤田≈黄陇侏罗纪煤田>渭北石炭–二叠纪煤田,划分出3种富油煤类型:富油煤型、富油煤–高油煤型、富油煤–含油煤型。按照煤炭资源量计算办法,全省已经查明的煤炭资源中富油煤+高油煤资源量为1550.33亿t,内蕴焦油资源量144.5亿t;预测出陕西省2000 m以浅煤炭资源总量中富油煤+高油煤资源量为3845亿t,内蕴焦油资源325亿t;并对富油煤资源控制程度进行划分。分析富油煤的成因机理,指出变质程度、沉积相及物质组成和埋藏条件等为富油煤形成的主要影响因素。针对目前煤炭开发中存在的资源浪费问题,提出一种富油煤原位地下热解多煤层协同开采的资源开发新思路。

Under the requirement of carbon peak and carbon neutral targets,the low carbon development and utilization of coal resources in Shaanxi Province is imperative.The law of tar yield from high to low in each coalfield of Shaanxi Province was revealed based on more than 5000 sets of coal quality data:northern Shaanxi Triassic Coalfield,northern Shaanxi Jurassic Coalfield,Shanbei carboniferous Permian Coalfield,Huanglong Jurassic Coalfield,Weibei carboniferous Permian Coalfield.And three types of oil-rich coal were classified:oil-rich coal type,oil-rich coal-high oil-coal type,oil-rich coal-oil-coal type.According to the calculation method of coal resources,Shaanxi Province has identified coal resources with 155.033 billion tons of oil-rich coal and high oil coal resources,containing 14.45 billion tons of tar resources.It is predicted that the total shallow coal resource of 2000 m in Shaanxi Province are 384.5 billion tons of rich-high oil coal and 32.5 billion tons of tar oil.The mechanism of the formation of oil-rich coal is analyzed,and it is pointed that the degree of Metamorphism,sedimentary facies,material composition and burial conditions are the main factors affecting the formation of oil-rich coal.A new idea of resource development of in situ underground pyrolysis of oil-rich coal with multiple coal seams is proposed for the waste of resources in the current coal development.