[1]高志勇,石雨昕,冯佳睿,等.水系与构造复合作用下的冲积扇沉积演化——以南天山山前黄水沟冲积扇为例[J].新疆石油地质,2019,(06):638.[doi:10.7657/XJPG20190602]
 GAO Zhiyong,SHI Yuxin,FENG Jiarui,et al.Sedimentary Evolution of Alluvial Fan Under Combined Action of Drainage System and Structure: A Case of Huangshuigou Alluvial Fan in Piedmont of Southern Tianshan Mountains[J].Xinjiang Petroleum Geology,2019,(06):638.[doi:10.7657/XJPG20190602]
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水系与构造复合作用下的冲积扇沉积演化——以南天山山前黄水沟冲积扇为例()
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《新疆石油地质》[ISSN:1001-3873/CN:65-1107/TE]

卷:
期数:
2019年06期
页码:
638
栏目:
出版日期:
2019-12-01

文章信息/Info

Title:
Sedimentary Evolution of Alluvial Fan Under Combined Action of Drainage System and Structure: A Case of Huangshuigou Alluvial Fan in Piedmont of Southern Tianshan Mountains
文章编号:
1001-3873(2019)06-0638-11
作者:
高志勇1石雨昕1冯佳睿1周川闽1翟羿程2樊小容2
(1.中国石油 勘探开发研究院 a.实验研究中心;b.提高石油采收率国家重点实验室,北京 100083;2.中国石油大学(北京)?地球科学学院,北京 102249
Author(s):
GAO Zhiyong1 SHI Yuxin1 FENG Jiarui1 ZHOU Chuanmin1 ZHAI Yicheng2 FAN Xiaorong2
(1.PetroChina Research Institute of Petroleum Exploration and Development, a.Petroleum Geology Research and Laboratory Center; b.State Key Laboratory of Enhanced Oil Recovery, Beijing 100083, China; 2.School of Geosciences, China University of Petroleum, Beijing 102249, China)
关键词:
南天山黄水沟冲积扇水系构造作用源汇体系砂砾质沉积成因
Keywords:
southern Tianshan Mountains Huangshuigou alluvial fan drainage system tectonism source-sink system sandy conglomerate sedimentogenesis
分类号:
TE111
DOI:
10.7657/XJPG20190602
文献标志码:
A
摘要:
通过解剖南天山山前现代冲积扇的扇根—扇端水系演化特征、砂砾质沉积物变化与搬运距离关系、沉积构造特征、冲积扇表面坡降梯度以及构造活动对沉积物的控制作用,认为现今南天山山前发育多个由水系与构造复合作用下的新型冲积扇。冲积扇表面的水系自物源区至冲积平原,具有由山间河—单一辫状河道—辫状河道复合带—低弯度单一径流河道—季节性河流的演化特征。冲积扇表面坡降梯度的突然变大,引起河道类型、宽度以及砂砾质沉积物粒径的变化。同时,早期沉积的弱固结成岩冲积扇,在构造隆升作用下,形成与南天山物源区走向平行、延伸数十公里的北陡南缓的褶皱带,其如同山前次级台阶,增加了沉积区的地形坡度,弱固结成岩的砂砾岩成了现今沉积的次要物源。在活动水系与构造隆升褶皱带复合作用下,形成“品”字形多期砂砾质冲积扇。建立了半干旱—干旱气候条件下水系与构造复合作用下的冲积扇沉积演化模式,为前陆冲断带砂砾质大面积分布的成因机理研究提供了依据。
Abstract:
By dissecting the evolution characteristics of the proximal-distal drainage systems of the modern alluvial fan in the piedmont of the southern Tianshan Mountains, the relationship between the sandy conglomeratic sediment variation and the transport distance, the structural characteristics, the slope gradient of fan surface, and the controlling effect of tectonic activities on sediments, it is considered that there are many new types of alluvial fans developed in the piedmont of the southern Tianshan Mountains, which are influenced by both drainage system and structure. The drainage system on the surface of the alluvial fans is distributed from provenance area to alluvial plain, which has the evolution features of intermountain river-single braided channel-composite braided channel zone-low curvature single runoff channel-seasonal river. The sudden increase of the slope gradient on the alluvial fan surface caused the changes of river channel type, channel width and sediment grain size. Meanwhile, a "steep in the north and gentle in the south" fold belt which is parallel to the provenance area in the southern Tianshan Mountains and extends tens of kilometers formed in the early deposited alluvial fan of weak consolidation diagenesis under the action of tectonic uplift. Like the secondary step in the piedmont area, the topographic slope of the depositional area increased and the sandy conglomerate with weak consolidation diagenesis provided the secondary source for the present deposition. Under the combined action of active drainage system and fold belt resulted from tectonic uplift, multi-stage sandy conglomeratic alluvial fan occurred. Based on the above understanding, the paper establishes a new model of alluvial fan sedimentary evolution under the combination of drainage system and tectonism in arid-semi-arid climate, which provides references for the genetic mechanism of large-scale distribution of sandy conglomeratic sediments in foreland thrust belt

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[1]刘 阵,王 鹏,张洪美,等.费尔干纳盆地形成演化及其对油气成藏的控制作用[J].新疆石油地质,2016,(01):120.[doi:10.7657/XJPG20160123]
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更新日期/Last Update: 2019-11-25