摘要
数值模拟作为研究热液成矿系统的重要手段,可以通过对地质演化过程的再现,深入了解其内在动力机制。数值模拟方法的运用,需要借助力学性质、流体性质、热力学性质等信息的搜集,来建立地质模型的初始条件(压力场和温度场)和边界条件(速度和时间)。采用有限元方法,将地质模型划分为形状不规则的众多小区域,并适当在地质结构复杂的区域对网格进行加密,基于达西定律和能量守恒定律,较为清晰地再现安徽沙溪斑岩铜(金)矿床成矿过程及其内在动力机制。经过对热液流体运移中的温度和压力变化情况进行探究,发现压力达到地压梯度的时间比温度达到地温梯度的时间短,并且在不同的地质区域和结构对压力和温度的传播方向和速度有影响。数值模拟方法是一个新的成矿学研究思路,可以较为清晰地展现成矿过程,流体运移路径实现矿液运输和矿体定位,为今后矿产开发提供参考和依据。
Numerical simulation is an important tool for studying hydrothermal metallogenic systems,which can be used to improve the understanding of their internal dynamic mechanism by reproducing the geological evolution process.The application of a numerical simulation method involves establishing the initial(pressure and temperature fields)and boundary(velocity and time)conditions of a geological model by collecting information regarding the mechanical,fluid,and thermodynamic properties.The finite element method was adopted to divide the geological model into several small regions with irregular formations,and the grid was appropriately encrypted in the regions with complex geological structures.Through Darcy's and energy conservation laws,the metallogenic process and its internal dynamic mechanism of Shaxi porphyry copper(gold)deposit in Anhui province were reconstructed.It was observed that the time for the pressure to reach the ground pressure gradient was shorter than that for the temperature to reach the ground temperature gradient,and the direction and speed of the pressure and temperature propagation were affected in different geological regions and structures.The numerical simulation method is a new minerogenetic research methodology,which can depict the metallogenic process clearly,realize the ore liquid transport and ore body location through the fluid migration path,and provide a reference and basis for future mineral development.
作者
范欣
FAN Xin(SINOPEC Geophysical Research Institute Co.,Ltd.,Nanjing 211103,China)
出处
《石油物探》
CSCD
北大核心
2023年第S01期171-178,共8页
Geophysical Prospecting For Petroleum
关键词
岩浆热液成矿
数值模拟
温度场
压力场
magmatic hydrothermal mineraliza tion
numerical simulation
temperature field
pressure field
