论文部分内容阅读
滨浅湖环境中广泛发育砂—泥沉积记录,油气生储盖组合配置较好,具有重要的油气地质意义。以济阳坳陷始新统孔店组为例,对滨浅湖环境中砂—泥沉积记录的形成机制及成岩系统进行研究。结果表明:济阳坳陷孔店组宏观上表现为砂—泥对偶、脉状泥岩和砂岩透镜体等3种砂—泥互层沉积层系;微观上主要为各种砂—泥过渡碎屑岩,含碎屑颗粒、黏土和碳酸盐等3种结构组分。砂泥互层沉积层系主要受控于浅水型三角洲侧翼的物质改造和滨浅湖环境中的共轭震荡,厚度受物质来源和水动力条件等制约;砂—泥过渡碎屑岩类主要跟水体动力机制和沉积分异作用有关。砂—泥互层沉积层系组成封闭性的成岩系统,泥岩成岩过程的早期压实排水和差异压实作用、中晚期黏土矿物转化、结构水和有机酸的排放制约砂岩层的成岩作用,而砂—泥过渡岩类封闭成岩系统主要受碎屑岩结构成熟度的制约。
Sand-mud sediment records are extensively developed in the shallow and shallow lake environment, and the combination of oil and gas reservoirs and reservoirs is good, which has important geological meaning of oil and gas. Taking the Eocene Kongdian Formation in the Jiyang Depression as an example, the formation mechanism and diagenetic system of sand-mud sedimentary records in the shallow-shore lake environment were studied. The results show that: The Kongdian Formation in the Jiyang Depression is characterized by three sand-mud interbedded sedimentary systems, such as sand-mud dual, vein mudstone and sandstone lens. The microscopic features are mainly sand-mud transitional clastic Rock, debris-bearing particles, clay and carbonate and other three kinds of structural components. The sand-mud interbedded sedimentary system is mainly controlled by the material modification of the shallow-water delta and the conjugate oscillation in the shore-shallow lake environment, and the thickness is controlled by the material source and hydrodynamic conditions. The sand-mud transitional clastic rocks are mainly composed of Hydrodynamic mechanism and sediment differentiation effect. The sand-mud interbedded sedimentary system constitutes a closed diagenetic system. Early compaction drainage and differential compaction of mudstone diagenesis process. Late-late clay mineral transformation, structural water and organic acid emissions restrict the diagenesis of sandstone beds. Sand-mud transitional rock closed diagenetic system is mainly controlled by the maturity of clastic rock structure.