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运用高分辨率层序地层学原理和方法,在海拉尔盆地苏31块南屯组二段识别出46个超短期、8个短期、4个中期及2个长期基准面旋回,并以沉积动力学观点分析了沉积特征随各级基准面旋回演化的规律。研究区目的层发育的主体沉积微相有辫状水下分流河道、席状砂及前三角洲泥。各级基准面旋回对沉积微相有较好的控制作用。随着基准面的上升,沉积物总体呈退积特征;随着基准面的下降,沉积物总体呈进积特征。基准面由上升到下降的转换面附近砂体相对不发育,基准面由下降到上升的转换面附近砂体相对发育。以基准面旋回及沉积动力学分析为核心的高分辨率层序地层学对深化复杂断陷盆地开发区块精细沉积特征研究具有重要意义。
Using the principles and methods of high-resolution sequence stratigraphy, 46 ultra-short period, 8 short-period, 4 mid-period and 2 long-term base-level cycles were identified in the second member of Nantun Formation in Su 31 block, Hailaer Basin. Sediment dynamics From the point of view, the sedimentary characteristics are analyzed with the cycle evolution of datums at all levels. The main sedimentary microfacies developed in the study area are braided underwater distributary channel, sand-like sand and the former delta mud. Datum cycles at all levels have good control over sedimentary microfacies. As the datum rises, the sediments are generally retrograded; as the datum declines, the sediments are generally characterized by sediment accumulation. The sand body is relatively undeveloped near the conversion surface where the datum rises from the descending surface, and the sand body relatively develops from the surface where the datum falls from the descending to the rising surface. High-resolution sequence stratigraphy based on datum cycle and sedimentary kinetic analysis is of great significance to the study of fine sedimentary features in the development blocks of complex faulted basins.