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埋藏白云石化作用是白云岩成因的主导模式,亦是控制川东北地区上二叠统长兴组海相优质礁滩相白云岩储集层形成演化的核心因素,围绕埋藏白云石化热卤水来源与交代通道、后期溶蚀路径、油气充注过程等一系列密切相关的流体成藏机理性问题,已成为当今碳酸盐岩领域研究的前沿热点和困扰勘探实践的瓶颈难点。运用流体—岩石相互作用和流体成藏动力学研究新进展与新方法,通过岩心观察、地球化学指标对比、温压场环境恢复、流体非均质性反演与运移路径模拟追踪分析,认为川东北地区长兴组与飞仙关组流体同源,多期的埋藏白云石化交代作用、溶蚀作用及油气充注过程时空耦合关系密切,热卤水来源于飞仙关组海源地层水,长兴组礁滩相白云岩储集层中的油气存在着源于飞仙关组流体以不整合、断裂、优质白云岩输导层为通道的“倒灌型”成藏模式。
Burial dolomitization is the dominant mode of dolomite formation and is also the core factor controlling the formation and evolution of the marine dolostone reservoirs in the Changxing Formation of the Upper Permian in the northeastern Sichuan Basin. A series of closely related fluid accumulation mechanics problems, such as channel, post-dissolution path and hydrocarbon filling process, have become the bottleneck in the research of the carbonate field and the bottleneck that plagued exploration practice. Using fluid-rock interaction and fluid accumulation dynamics to study new progress and new methods, through core observation, comparison of geochemical indicators, recovery of temperature and pressure fields, inversion of fluid inhomogeneity and migration tracking simulation, it is considered that The Changxing Formation and the Feixianguan Formation in northeastern Sichuan have fluid homology and multi-stage dolomitization metasomatism, dissolution and close coupling in space-time. Hydrothermal brine comes from the source formation water of Feixianguan Formation and Changxing reef The hydrocarbon accumulation in the beach facies dolomite reservoirs is characterized by the “backfill ” accumulation mode which originated from the unconformity, fracture and high-quality dolomite channel in the Feixianguan Formation.