川西须家河组深层致密砂岩流体-岩石相互作用及储层响应机制

流体-岩石作用贯穿整个成岩演化过程，决定了储层孔隙度的演化，是一个兼具前沿性、学科交叉性和实用性的研究领域。川西深层致密砂岩相对优质储层的发育与沉积期后流体-岩石作用密切相关，但目前针对该区深层致密砂岩流体-岩石作用及与之有关的储层响应机制的研究未见报道。因此本项目拟在尽量逼近地下真实状态的各种条件约束下，通过成岩物理模拟实验，对川西须家河组致密砂岩流体-岩石相互作用过程进行原位观察和重建，进而将成岩物理模拟实验和地球化学数值模拟融合，力求在以下两个方面取得突破：①明确川西地区须家河组致密砂岩主要成岩矿物溶解/沉淀流体-岩石作用机制，建立流体-岩石相互作用模式。②明确须家河组深层致密砂岩储层响应机制，探讨深层致密砂岩溶蚀孔隙发育机理。这既能丰富深层流体-岩石相互作用理论体系，也能为深层致密砂岩储层质量预测提供依据，因此兼具重要的科学意义和现实意义。

Fluid- rock interaction is a frontier, interdisciplinary and practical research field, which going through the whole process of diagenetic evolution process, and determining the evolution of reservoir porosity. At present, the study on fluid-rock interaction of deep tight sandstone and related reservoir response mechanism needs to be further deepened. In our research, the process of fluid - rock interaction in tight sandstone of Xujiahe formation in western Sichuan was observed and reconstructed in situ, through diagenesis physical simulation experiment and under various conditions of the underground real state as close as possible. Then the diagenesis physical simulation experiment and geochemistry numerical simulation are combined, striving for breakthroughs in the following two areas: ①The mechanism of fluid-rock interaction of main diagenetic minerals dissolved/precipitated in the dense sandstone of Xujiahe formation in western Sichuan is clarified, and the fluid-rock interaction model is established. ②The response mechanism of deep tight sandstone reservoir in Xujiahe formation is clarified and the mechanism of dissolution pore development of deep tight sandstone is discussed. The research can not only enrich the theoretical system of deep fluid-rock interaction, but also provide a basis for the quality prediction of deep tight sandstone reservoirs, so it has important scientific and practical significance.