| 干旱气候环境下季节性河流沉积特征——以库车河剖面下白垩统为例 |
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| 引用本文： | 高志勇,冯佳睿,周川闽,崔京钢,李小陪,赵雪松,郭美丽,吴昊. 干旱气候环境下季节性河流沉积特征——以库车河剖面下白垩统为例[J]. 沉积学报, 2014, 32(6): 1060-1071 |
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| 作者姓名： | 高志勇 冯佳睿 周川闽 崔京钢 李小陪 赵雪松 郭美丽 吴昊 |
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| 作者单位： | 1.中国石油勘探开发研究院实验研究中心 北京 100083; |
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| 基金项目： | 国家科技重大专项课题“中西部前陆盆地构造地质、储层特征及有利区评价”(编号:2011ZX05003-002);中国石油股份公司科技项目“中西部前陆盆地沉积体系与有效储层评价研究”(编号:2014B-0408)联合资助 |
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| 摘 要： | 通过对库车河剖面下白垩统巴西改组—古近系库姆格列木群底部的沉积露头实测,分析砂岩岩性组合、沉积构造特征、砾岩特征及沉积古环境,并结合现代天山南北季节性河流沉积特征,认为干旱气候条件下发育的季节性河流及季节性河流三角洲是白垩纪库车坳陷发育的重要沉积体系.下白垩统巴什基奇克组砂岩特征与现今广泛发育的季节性河流沉积特征极为相似,既有较为典型的河流相正韵律砂体大面积沉积,河道底部内碎屑泥砾与厚层块状的大型交错层理等砂岩,又显示出高能细砂岩和高能粉砂岩沉积,并具有较低的成分成熟度和较高的结构成熟度基本特征.在此基础上,建立了库车河剖面下白垩统巴西改组—巴什基奇克组沉积相模式:巴西改组沉积时期,库车坳陷发育面积较大的宽浅型湖泊,天山前发育的季节性河流进入湖泊后形成季节性河流三角洲;巴什基奇克组沉积时期,古天山前出现了多个小型湖泊,古天山山前发育大量的季节性辫状河与多个小型季节性辫状三角洲沉积.
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| 关 键 词： | 干旱气候 季节性河流 季节性河流三角洲 库车河剖面 下白垩统 巴什基奇克组 |
| 收稿时间： | 2013-09-16 |
Arid Climate Seasonal Rivers Deposition: A case of Lower Cretaceous in Kuche river outcrop |
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| Affiliation: | 1.Petroleum Geology Research and Laboratory Center RIPED, Beijing 100083;2.State Key Laboratory of Enhanced Oil Recovery(Research Institute of Petroleum Exploration and Development), Beijing 100083;3.China University of Geosciences, Beijing 100083 |
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| Abstract: | Through the restructuring of the Kuche river section of Lower Cretaceous-Paleogene Kumugeliemu group sedimentary outcrop observation, analysis of sandstone lithology combination, sedimentary structure, gravel characteristics and sedimentary environment, combined with the sedimentary features of seasonal river in Tianshan north and south. It is an important depositional system that the seasonal rivers and seasonal river delta developed under arid climatic conditions in Cretaceous of Kuche depression. The seasonal river sedimentary characteristics of the lower Cretaceous Bashijiqike Formation and the extensive development is very similar, both typical fluvial facies sedimentary rhythm sand body is widespread, the river bottom mud gravel and detritus thick massive large-scale cross bedding sandstone, but also show a high-energy fine sandstones and silty sandstone, with higher structural maturity and lower compositional maturity. On this basis, the establishment of the Kuche river section of Lower Cretaceous Basi Group restructuring of sedimentary facies model. In Baxigai Formation sedimentary period, development area wide shallow lakes larger in Kuche depression, the development of seasonal rivers into the lakes formed seasonal rivers Delta. In Bashijiqike Formation sedimentary period, a number of small lakes emergence in front of the ancient Tianshan Mountains, ancient Tianshan Piedmont seasonal braided river and a large number of multiple seasonal small braided delta were deposited. |
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