| 苏北盆地白驹凹陷古近系层序地层特征及充填演化模式 |
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| 关键词:sequence stratigraphy filling evolution models Paleogene Baiju sag Subei basin |
| 基金项目:四川省重点学科建设基金项目(编号: SZD0414); 中石油浙江油田公司基本科研项目“苏北探区地层层序划分与钻井地层统层研究”(编号: ZJYT2009-275) |
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| Sequence Stratigraphy Characteristics and Filling Evolution Models of Paleogene in Baiju Sag, Subei Basin |
| Based on the identification features of stratigraphic sequences of the continental faulted basin along electric logging curves and seismic profiles as well as the characteristics of lithologic combination and palaeontological data, the authors identified six Paleogene sequence boundaries in Baiju sag of Subei basin and divided the Paleogene into one super sequence group, two super sequences, and five sequences. SQ1 and SQ2~SQ4 are lacustrine sequences developed in the initial faulting phase and faulting-depression stage of faulting episode I, while SQ5 is the fluvial sequence developed in the faulting convergence stage of faulting episode Ⅲ. Based on the episodic tectonic evolution, different climate conditions and suppy of sediments for the basin in each evolution phase, the authors established three kinds of sequence stratigraphy filling evolution models composed of initial faulting phase, faulting-depression stage and faulting convergence stage. It is thought that different tectono-evolutionary stages have significantly different filling sequences, system tract constituents and sand body developments. A preliminary analysis was made on the relationship between sequence stratigraphic filling evolution models and oil-gas exploration potentials, which reveals that the configuration relationship between sand bodies in lowstand and highstand systems tracts and hydrocarbon source rock in lacustrine transgressive system tract of faulting-depression stage of the faulting episodeⅠ is the best in that it has the most advantageous hydrocarbon accumulation condition. |
| WEI Xiang-feng,ZHANG Ting-shan,HUANG Jing,LIANG Xing,YAO Qiu-chang,TANG Xing-you.2011.Sequence Stratigraphy Characteristics and Filling Evolution Models of Paleogene in Baiju Sag, Subei Basin[J].Acta Geoscientica Sinica,32(4):427-437. |
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