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在三级层序地层格架内,从体系域及层序界面的角度对黔南石炭系碳酸盐岩的成岩作用进行了研究。结果表明,与LST有关的成岩作用主要为范围广泛的暴露溶蚀作用;与TST有关的成岩作用主要发育于海底成岩环境和混合水成岩环境,其中后者会随着海平面的不断上升而向大陆迁移;与HST有关的成岩作用主要包括发育于海底成岩环境的胶结作用及高位晚期的大气淡水成岩环境中的溶蚀、胶结和白云石化作用。与Ⅰ型层序界面有关的成岩作用主要有溶蚀作用、胶结作用和白云石化作用,成岩时间长、强度大,并且在黔南可进行区域对比;与Ⅱ型层序界面相关的成岩作用发育规模小,对碳酸盐岩的改造能力较弱。与HST有关的成岩作用及与Ⅰ型层序界面有关的成岩作用对碳酸盐岩储层的改造能力强,往往可形成厚层的白云岩及规模较大的溶蚀孔洞体系,因此,可以作为有利储层追踪对比及预测的有力地质依据之一。
In the framework of the third-order sequence stratigraphy, the diagenesis of Carboniferous carbonatites in southern Guizhou is studied from the perspective of system and sequence boundaries. The results show that the diagenesis associated with LST is dominated by a wide range of exposure and erosion; the diagenesis associated with TST mainly occurs in submarine diagenetic and mixed diagenetic environments, with the latter migrating to the mainland as the sea level rises The diagenesis related to HST mainly includes the cementation in the seafloor diagenetic environment and the dissolution, cementation and dolomitization in the late high atmospheric diagenetic environment. The diagenesis related to the type Ⅰ sequence interface mainly includes dissolution, cementation and dolomitization, with long diagenesis and strong intensity, and can be compared in the southern Guizhou Province. The diagenetic development scale associated with the type Ⅱ sequence boundary Small, the ability to transform the carbonate rock is weak. HST-related diagenesis and diagenesis associated with type-Ⅰ sequence boundaries have strong ability to reform carbonate reservoirs, often resulting in thick dolomites and large-scale dissolved pore systems. Therefore, Beneficial reservoir tracking comparison and prediction of a strong geological basis.