【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。更多还原

【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 palaeo-karst-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 Ordovician palaeo-karst development law in Tahe Oilfield.更多还原