镜质组反射率梯度与古地温梯度间的关系研究——以陕北榆神矿区5^-2富油煤层为例  

Relationship between Vitrinite Reflectance Gradient and Paleogeothermal Gradient—Taking 5-2 Oil Rich Coal Seam in Yushen Mining Area in Northern Shaanxi as an Example

作　　者：马青华[1] 张学梅[1] 赵晓东 魏亚玲 郝静远 

机构地区：[1]西安思源学院,能源及化工大数据应用教学研究中心,陕西 西安 [2]北京德秦技术开发有限公司,北京 [3]宁夏叁方煤质检测科技有限公司,宁夏 银川 [4]西安交通大学化工学院,陕西 西安

出　　处：《自然科学》2022年第4期489-497,共9页Open Journal of Nature Science

摘　　要：利用吴氏煤变质热动力学方程计算5-2富油煤层的变质温度为54.2℃~76.6℃,并画出古地质时间、镜质组反射率和变质温度三者之间的关系图。为了解释极大的埋深或地温梯度差距,利用不超过深成变质的镜质组反射率梯度值 -2富油煤层的地质数据,计算得到在R0 = 0.53%,ΔR0= 0.06%/百米,t = 193百万年时产生的地温梯度是9.14℃/百米为最大值,计算得到在R0 = 0.53%,ΔR0= 0.01%/百米,t = 205百万年时产生的地温梯度是1.55℃/百米为最小值。即使是在相同的地质条件范围内(古地质时间、镜质组反射率、埋深),也能够满足转化为不同煤化阶段所需的温度。A coal metamorphic thermal dynamics equation has been used to calculate the paleo-geo temperature of 5-2 oil-rich coal seam, and the results are 54.2˚C~76.6˚C, and shown in a three dimensional drawing of paleo-geo time, vitrinite reflectance and metamorphic temperature. In order to account for the great buried depth or paleo-geo temperature gradient gaps, the paleo-geo temperature gradient was recalculated using a vitrinite reflectance gradient of -2 oil-rich coal seam, the paleo-geo temperature gradient generated at R0 = 0.53%, ΔR0= 0.06%/100 m, t = 193 million years is 9.14˚C/100 m, and the paleo-geo temperature gradient generated at R0 = 0.53%, ΔR0= 0.01%/100 m, t = 205 million years is 1.55˚C/100 m which is the minimum. Even within the same geological conditions (paleo-geo time, vitrinite reflectance, buried depth), it can meet the temperature required for conversion into different metamorphism stages.

关 键 词：煤变质热动力学方程 变质温度 埋深温度 镜质组反射率梯度 温度梯度 

分 类 号：P618[天文地球—矿床学]