利用应力场预测热液区域——以TAG区为例

本文根据TAG区的钻探资料及岩心测试结果，建立了双层地质模型，在此基础上利用ANSYS应力软件并结合TAG热液区的地形数据对该区进行应力模拟。结果表明:热液喷口区域与最大水平应力低值区有较好的对应关系。其中仍处于活动状态的TAG丘状体区呈现明显的局部最大水平应力低值；而已经停止活动并且不具有典型喷口地形的MIR丘状体区域则处于最大水平应力的非封闭低值区域。据此，本文在TAG丘状体区域圈定了5个喷口可能区域，钻探结果揭示区内存在较好的矿化和蚀变现象，表明应力场预测法可能是一种有效的成矿预测方法。

Analyzing the gravitational stress field to forecast hydrothermal field-A case study of TAG hydrothemal field

According to drilling data, two layer''s model is established by corresponding physical properties. Based on topographic data, here we use ANSYS software to simulate the gravitational stress field of TAG hydrothermal field. The result shows that, the hydrothermal vent locations are corresponding to the low stress area of the maximum horizontal stress. The stress of the active TAG doom area are characterized by local stress low surrounding by relative stress high, and the inactive MIR doom area without typical hydrothermal vent topography features located on unclosed area of the maximum horizontal stress low. Based on these conclusions, we predicted five places where the hydrothermal liquid probably flew out. According to drilling result, significant anhydrite was recovered in these areas, indicating that gravitational stress could be used for hydrothermal activity prediction.