| 准噶尔盆地车排子凸起下切谷特征及演化模式 |
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| 引用本文： | 叶茂松,解习农.准噶尔盆地车排子凸起下切谷特征及演化模式[J].地球科学,2014,39(5):577-586. |
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| 作者姓名： | 叶茂松 解习农 |
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| 作者单位： | 中国地质大学构造与油气资源教育部重点实验室，湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金(No.41372112) |
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| 摘 要： | 下切谷作为一种特殊的层序内部组成要素，其侵蚀-充填演化模式对于层序划分和油气勘探均具有重要意义.综合利用三维地震、钻井、古生物等资料，展开了对下切谷下切-充填的演化过程分析.研究表明地震相干切片识别出东西、南东、南北3类不同流向的下切谷.在地震剖面上，下切谷表现为以V型为主的形态特征，内部充填样式以前积、发散、上超等样式为主.结合区域地质背景分析认为，海西-燕山运动期车排子凸起强烈隆升，基准面快速下降导致对下伏地层产生侵蚀，下切谷由此产生.古近系之后开始沉降，基准面重新上升使得下切谷开始接受沉积充填，充填时限与古岸线位置有关.对下切谷的演化控制因素讨论认为，下切谷的下切-充填演化受到构造、古地貌、古气候及物源供给等因素的共同影响.
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| 关 键 词： | 车排子 下切谷 基准面 充填 演化模式 地震勘探 地层学 |
| 收稿时间： | 2013-05-11 |
Characteristics and Evolutionary Pattern of Incised Valley in Chepaizi Area,Junggar Basin |
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| Abstract: | It is important for sequence stratigraphy and oil-gas exploration to explore major internal sequence compositions such as the evolution of erosion and filling patterns. In this paper, incised valley characteristics and evolutionary model are studied using 3D seismic data, drilling data and paleontological data. The results show that there are a series of incised valleys in the study area, which are determined and divided into three different kinds of strike including E-W, S-E and N-S respectively by the seismic profile. The morphology of incised valleys on the seismic profile shows a V-shape, while the internal filling patterns are of progradational configuration, divergent configuration and on-lap configuration. Regional geological data indicate that Chepaizi area started to uplift during the Heisey-Indosinian movement, resulting in the formation of an incised valley by a drop in base level. After the Paleogene, the base level restarted to rise, so the incised valley started to fill, with the filling time related to the position of ancient coastline. The evolutionary model of incised valleys is controlled by tectonics, topography, paleoclimate and source supply. |
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