【摘要】 应用"将今论古"的辩证思维观,对青海湖开展了现代沉积研究。结果认为:从湖盆周边剥蚀区至湖泊沉积中心发育有各种类型的河流沉积体系、三角洲沉积体系、扇三角洲沉积体系、潟湖沉积体系、风成沙沉积体系、水下扇沉积体系,丰富的滩坝沉积体系、滨浅湖沉积体系以及深湖、半深湖沉积体系;地形、地貌、气候、断裂构造与水流决定着沉积体系展布的规模、形态和沉积相带边界及砂体分布。进而总结出了不同环境下各种沉积体系成因分布和储层展布规律,并借鉴现代沉积模式和成因机制,恢复古代含油气盆地沉积原貌,建立了沉积体系和砂体分布的预测模型。以期指导对该区复杂岩性油气藏的精细勘探。更多还原

【Abstract】 Based on the dialectical thinking point of view of "present being a key to past",the modern deposits in Qinghai Lake are studied.From the erosion area in the periphery of the lake basin to its depocenter,various depositional systems are recognized,including channel,delta,fan delta,lagoon,aeolian sand,subfluvial fan delta,bar and shore-shallow lake,as well as bathyal and deep lake.The sizes,shapes and boundaries of sedimentary facies belt and distribution of sandbodies are controlled by landform,geomorphic features,climate,faults and streams.The genetic distribution of various sedimentary systems and the pattern of reservoir distribution in different settings are summarized,the original appearance of sedimentation in the ancient petroliferous basin is reconstructed with the modern depositional model and genetic mechanism as analogues.A forecasting model is built for predicting sedimentary systems and distribution of sandbodies.These study results are expected to guide the precise exploration of lithologic hydrocarbon reservoirs in the study area.更多还原