| 岩溶流域的水系变迁——以塔河油田6区西北部奥陶系古岩溶为例 |
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| 引用本文： | 蔡忠贤,刘永立,段金宝.岩溶流域的水系变迁——以塔河油田6区西北部奥陶系古岩溶为例[J].中国岩溶,2009,28(1):30-34. |
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| 作者姓名： | 蔡忠贤 刘永立 段金宝 |
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| 作者单位： | 1. 中国地质大学资源学院,湖北武汉,430074;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
2. 中国石油化工股份有限公司勘探南方分公司,四川成都,610041 |
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| 基金项目： | 国家重点基础研究发展规划(973计划) |
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| 摘 要： | 在现代流水地貌中,由于构造运动、岩性差异以及水流侧蚀等因素,常常出现水系袭夺,并随之伴生一系列特殊的水文地貌现象,如袭夺肘、风峡、袭夺肘以下的深切河谷、断头河和倒淌河等。基于三维地震资料,本文应用地震属性分析及地震成图等相关技术,对塔河油田中-下奥陶统顶部海西早期的岩溶古地貌和古水系进行了恢复识别,发现海西早期也存在类似的水文地貌现象。依据现代水系变迁理论,证实了塔河油田6区岩溶流域早期为南向汇流结构,而后期由于西北部侵蚀基准面下降,本区流域不断被西北部流域袭夺,并大面积倒转为北西向汇流结构,再现了本区岩溶古水系及流域的阶段性演化过程,从而为揭示塔河油田奥陶系古岩溶发育规律提供了重要依据。
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| 关 键 词： | 水系袭夺 古岩溶 奥陶系 塔河油田 |
Transition of river system in karst basin-A case study on Ordovician palaeo-karst in the northwest of Block 6, Tahe Oilfield |
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| CAI Zhong-xian,LIU Yong-li,DUAN Jin-bao.Transition of river system in karst basin-A case study on Ordovician palaeo-karst in the northwest of Block 6, Tahe Oilfield[J].Carsologica Sinica,2009,28(1):30-34. |
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| Authors: | CAI Zhong-xian LIU Yong-li DUAN Jin-bao |
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| Institution: | CAI Zhong-xian ,LIU Yong-li ,DUAN Jin-bao (1. Faculty of Resources, China University of Geosciences, Wuhan, Hubei 430074, China; 2. Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences ) , Ministry of Education, Wuhan , Hubei 430074, China ; 3. Southern Exploration ＆ Development Company, SINOPEC, Chengdu, Sichuan 610041, China) |
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| Abstract: | Because of tectonic movement, lithology diversity and lateral erosion of flow, river capture usually appears in modern fluvial landform, that is accompanied by a series of peculiar hydro-geomorphic phenomenon like captured elbow, wind gap, valley meander below the captured elbow and beheaded river and inverted river, etc. Based on 3D seismic data, applying seismic attribute and seismic imaging, the palaeokarst-geomorphology and palaeo-drainage pattern are described and recognized in this paper. The peculiar hydro-geomorphic phenomenon is discovered in palaeo-geomorphologic map. In the light of the theory on modern river system change, it had been south-confluence structure in Block 6, Tahe Oilfield. And then, the base level of erosion declined, so this basin had been captured by the drainage basin in the north, most of which had been northwest-confluence structure. The evolutionary process of palaeo-karst-drainage pattern and drainage basin is reappeared in this paper, which supply significant foundation for revealing the Ordovielan palaeo-karst development law in Tahe Oilfield. |
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| Keywords: | river system capture palaeo-karst the Ordovician system Tahe oilfield |
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