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Thickening-upward cycles in deep-marine and deep-lacustrine turbidite lobes:examples from the Clare Basin and the Ordos Basin

引用

Journal of Palaeogeography 2020年第2期9卷 216-231页

作者： Lei-Fu Zhang Da-Zhong Dong PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083China School of Geological Sciences University College DublinDublin 4Ireland National Energy Shale Gas Research(Experiment)Center Langfang 065CX)7Hebei ProvinceChina CNPC Key Laboratory of Unconventional Oil and Gas Langfang 065007Hebei ProvinceChina

Deep-marine and deep-lacustrine reservoirs have been targets for conventional and unconventional oil and gas exploration and development for decades. Thickening-upward cycles in the deep-marine Carboniferous Ross Sandstone formation outcrops in western Ireland and the deep-lacustrine Triassic Yanchang formation outcrops in southeast Ordos Basin have been investigated and correlated in this study. Typical thickening-upward cycles consisting of, from bottom to top:(1) laminated shales/shales with interbedded siltstone beds;(2) interbedded sandstones/siltstones and mudstones;(3) structureless massive sandstones, are well recognized in these outcrops and are interpreted as turbidite lobes. A continuously prograding lobe-element model is proposed to explain the repeated stacking of thickening-upward cycles. Thickening-upward cycles developed within deep-marine and deeplacustrine environments are highly comparable in many aspects, such as sedimentary structures, sheet-like geometries and amalgamation features. A frequent and strong degree of amalgamation is developed within the massive sandstone at the top of each thickening-upward cycle, suggesting a layer-by-layer depositional *** observations and comparison with deep-marine counterparts support the occurrence of turbidity flows in the Yanchang formation, Ordos Basin.

关键词： Thickening-upward cycle Deep-marine turbidite Deep-lacustrine turbidite yangchang formation Ordos Basin Kilbaha Bay

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