龙门山地震断裂带震后愈合期流体-岩石作用机制研究

Basing on the deep seismic fault rocks and the boreholes supplied by the “Wenchuan Earthquake Scientific Drilling” project, we will take the fluid-rock interaction as the key point to investigate the fault healing process. Certain fault zones will be selected to identify the compositional, structural, geochemical and physical features; then the core and in-site fluid samples will be collected, analyzed and used for model experiments to obtain the detailed microstructure and geochemical characteristics. Furthermore, various data will be combined together including the modeling results, drilling fluid monitoring records, logging data, core and periodic observation profiles, to recognize the fluid anomalies and determine the fluid-rock interaction mechanism during the post-seismic fault healing period, and then to give new insights for knowing the seismic fault evolvement.

本项目将基于“汶川地震断裂带科学钻探”钻井直接获取的地下地震断裂岩石样品和钻孔，以流体-岩石相互作用为突破口，选取典型的断层带，获得断层岩和围岩的成分、结构、地球化学和物性信息，通过采集岩心和钻孔原位流体样品，开展模拟实验，获取其详细的显微结构构造和地球化学特征，综合模拟实验、钻孔随钻流体监测、测井、岩心和完钻钻孔长期监测等各种资料，展开多学科综合分析，识别震后断层愈合期的流体异常和确定流体-岩石作用机制，为科学认识地震断裂演化作用提供新的资料。

项目基于“汶川地震断裂带科学钻探”钻井直接获取的地下地震断裂岩石样品，以流体-岩石相互作用为突破口，选取典型的断层带，通过采集岩心和钻孔原位流体样品，开展模拟实验，获取其详细的显微结构构造和地球化学特征，综合模拟实验、岩心等各种资料，展开多学科综合分析，识别出汶川地震两条不同性质发震断层的矿物学表现，尤其是新地震化石-石墨化过程在其间的典型差异，由此讨论了两条断层不同演化机制，为科学认识龙门山地震断裂作用过程提供了新的资料。