扇三角洲沉积学研究进展

Advances in Fan Deltaic Sedimentology

在对扇三角洲沉积学研究文献广泛调研的基础上,从扇三角洲沉积体系分类、岩石相类型和沉积层序特征、沉积模式、研究方法等4个方面介绍了扇三角洲沉积学研究的进展。认为扇三角洲的分类应当更加实用,不仅应考虑三角洲前缘水动力和地貌特征,更应当考虑如何在地层记录中区别不同类型的扇三角洲。应当注重运用流体力学和水力学原理,对扇三角洲的岩石相进行成因解释,注重研究构造作用、气候变化、湖(海)平面变化以及沉积自旋回对扇三角洲沉积层序形成的控制作用。随着研究实例的不断增加,扇三角洲的沉积模式将会越来越多,应当结合室内试验、计算机模拟和现代分析测试技术开展扇三角洲沉积学综合研究。

The advances about sedimentological study of fan deltas were reviewed based upon a great database of numerous research litera-tures at home and abroad,including 1）definition,classification and terminology; 2）lithofacies and sedimentary sequences characteristics;3）depositional models and 4）research methodology.It is suggested that classifications for fan deltas should be more practical in their appli-cations,the hydraulic and geomorphic parameters from modern delta front,and the most important rock characters from the ancient strati-graphic records should all be considered.The hydrodynamic principle should be involved in interpretation of the lithofacies of fan deltas.More studies are needed to analyze the controlling effects of tectonic movement,climatic vibration,sea/lake level changes and deposition-al autocyclic processes on the formation of fan dealtaic depositional sequences.Fan delta models type may increase with time and newmethods such as flume experiment,computerized forward modeling and geostatistic stochastic simulation may be used more frequently infan delta sedimentological research in the future.