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煤系地层的成岩演化一般都会导致酸性成岩环境,但是对库车坳陷东部吐格尔明背斜构造带内下侏罗统阿合组粗碎屑岩中普遍存在的石英和方沸石溶蚀现象的研究表明,阿合组粗碎屑岩在成岩演化的早期阶段经历过由酸性向较强的碱性成岩环境过渡的过程,碱性环境下的钙质胶结物占据了碎屑颗粒之间的原生孔隙并提高了岩石的抗压实能力。后期的风化淋滤使钙质胶结物被溶解,从而使原生孔隙释放出来,导致该地区阿合组储集岩的物性普遍较好。因此,成岩阶段的碱性环境对阿合组碎屑岩储集层物性的后期改善具有重要作用。
The diagenetic evolution of coal measures generally leads to acidic diagenetic environment. However, the common dissolution of quartz and analcite in the Lower Jurassic Amgen coarse clastic rocks within the Tuker Ming anticline belt in the eastern Kuche depression Shows that the coarse aggregates from the Ahe Formation experienced a transition from an acidic to a strong alkaline diagenetic environment during the early stages of diagenetic evolution. The calcareous cements in an alkaline environment occupy between the detrital grains Native pores and improve the rock’s ability to resist pressure. Later weathered leaching made the calcareous cement dissolve, so that the primary pores were released, resulting in generally better physical properties of the Ahe formation reservoir rocks. Therefore, the alkaline environment in the diagenetic stage plays an important role in the later improvement of physical properties of the Agra clastic reservoir.