Sequence Stratigraphic Architectures of Intra-Cratonic Basin and Its Controlling Factors
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摘要: 通过总结我国鄂尔多斯盆地和澳大利亚Surat basin这两个典型的陆内克拉通盆地的层序充填序列，认为该类盆地具有典型的层序地层充填模式：(1)典型的正粒序岩性组合特征；(2)基准面旋回为上升半旋回为主的不对称旋回，具有长期持续水进、短期水退旋回特征；(3)层序主要以LST为主，发育相互切割叠置的复合砂体，为最有利储层；TST和HST相对不发育，发育孤立状的单砂体，为中-差储层.陆内克拉通盆地层序地层及其控制的砂体具有"溯源退积"的时空展布模式，该模式主要受到盆地边缘构造、沉积物供给、湖平面变化、古地形、"盆地充填"和气候等因素的单独或综合控制.Abstract: Our study on two typical intra-cratonic basins, namely, Ordos basin, China and Surat basin, Australia indicates that the sequence stratigraphic infilling succession is correlated, The study results show that intra-cratonic basin has unique stratigraphic infilling characteristics, such as (1) typical fining-upward lithology association successions with a sandstone-rich lower part and a mudstone-rich upper part; (2) asymmetrical base level cycle mainly composed of ascending half cycle, with the characteristic of long term transgression and short term regression; (3) sequence stratigraphy made up primarily of a lowstand system tract with multistorey stacked sandstones forming excellent reservoir quality, and little deposition of transgressive system tract and highstand systems tract with isolated sandstones within mud-dominated deposits forming medium or poor reservoir. The spatial and temporal distributions of sequence stratigraphy and sandstones in the intra-cratonic basin are characterized by the source-ward retrogradation controlled by structure action of basin margin, sediment supply, eustasy, palaeotopography, basin infilling, climate, or integrated influence of above-listed factors.
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图 1 不同陆相盆地层序、沉积特征对比
Fig. 1. Correlation of sequence stratigraphic and sedimentary characteristic in different continental basins
图 2 中-澳陆内克拉通盆地沉积-层序充填模式
Fig. 2. Generalised stratigraphic and sedimentary model of the typical intra-cratonic basins of Ordos basin, China and Surat basin, Australia, showing lithology associations, sequence stratigraphic framework and base level cycle
图 3 陆内克拉通盆地层序溯源退积模式(鄂尔多斯盆地资料)
Fig. 3. Retrogradation model of stratigraphic stacking pattern for intra-cratonic basin
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