The characteristics of the system domain and the stratigraphic framework of the Beikang-Zengmu Basin since the Middle Miocene
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摘要:
开展地震资料解释，分析上超、下超、顶超等地震反射终止关系、不整合面以及沉积趋势，识别出北康-曾母盆地中中新世以来14个三级层序界面。在层序界面内部，通过层序地层内幕结构刻画和原形剖面恢复，并结合地层堆砌方式，在北康-曾母盆地中中新世以来的层序地层内，划分了海进、高位正常海退、强制海退和低位正常海退4种成因单元。通过进一步研究该4种成因单元内地层结构和相分布关系，提出北康-曾母盆地中中新世以来的3种层序地层样式，即陆架边缘富砂型三角洲进积楔、退积型生物礁和陆架边缘富砂-富泥型退积楔，其中，沉积物源供应量充足且可容空间减小时，发育富砂的三角洲进积楔，陆架边缘-斜坡-盆地区域发育含砂深水扇；而可容空间增量远大于沉积物供应量时，发育退积型生物礁和富砂-富泥退积楔，斜坡-盆地区域含砂深水扇欠发育。
Abstract:With the development of sequence stratigraphy, it has been widely used in all stages of oil-gas exploration, using sequence stratigraphy to study relative sea level change, sequence stratigraphic framework and sedimentary facies can provide guidance for favorable reservoir facies belt distribution, sand-body morphology and boundary characterization. In seismic data interpretation, analyzing seismic reflection termination relationships (onlap, downlap, toplap and so on), unconformities and depositional trends, fourteen third-order sequence interfaces have been identified in the Beikang-Zengmu basin since the Middle Miocene, respectively named SB1-SB14 and SB11, SB8 and SB1 corresponds to the Guangzhou Marine Geological Survey of T1, T2 and T3 reflection interface. By delineating the inner structure of sequence stratigraphy and restoring the original profile, and combining with the stratigraphic stacking method, in the sequence stratigraphic framework of Beikang-Zengmu Basin since the Middle Miocene, four genetic units have been divided into transgression, high normal regression, forced regression and low normal regression. By further studying the interior layer structure and facies distribution of the four genetic units, three sequence stratigraphic framework patterns since the Middle Miocene in the Beikang-Zengmu Basin were proposed, namely, sand-rich delta advance wedge at the shelf edge, regressive organic reef, and sand-rich mud-rich retreat wedge at the shelf edge. Among them, the supply of sediment source is sufficient and the accommodating space is reduced when there is less space, and the sand-rich delta wedge is developed, and the sand-bearing deep-water fan is developed in the shelf margin-slope-basin area. However, when the increment of accommodating space was much larger than the sediment supply, there were regressive organic reefs and sand-rich mud-rich sedimentation wedges, and sandy deep-water fans in the slope-basin area were underdeveloped.
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