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 deep-lacustrine 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 manner. Field observations and comparison with deep-marine counterparts support the occurrence of turbidity flows in the Yanchang Formation, Ordos Basin.

中文翻译：

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深海和深湖浊积岩裂片的增厚向上旋回：以克莱尔盆地和鄂尔多斯盆地为例

几十年来，深海和深湖储层一直是常规和非常规油气勘探开发的目标。本研究对爱尔兰西部深海石炭系罗斯砂岩组露头和鄂尔多斯盆地东南部深湖相三叠系延长组露头的增厚-向上旋回进行了调查和对比。典型的增厚向上循环包括，从下到上： (1) 层状页岩/页岩与粉砂岩层互层；(2) 互层砂岩/粉砂岩和泥岩；(3) 无结构的块状砂岩，在这些露头中得到很好的识别，并被解释为浊流裂片。提出了一个连续渐进的叶元模型来解释增厚向上循环的重复叠加。深海和深湖环境中发育的增厚-向上旋回在沉积构造、片状几何形状和混杂特征等方面具有很强的可比性。每次增厚向上旋回顶部的块状砂岩内均发育频繁且强烈的混杂作用，表明为逐层沉积方式。鄂尔多斯盆地延长组的现场观测和与深海对应物的比较支持浊流的发生。建议采用逐层沉积方式。鄂尔多斯盆地延长组的现场观测和与深海对应物的比较支持浊流的发生。建议采用逐层沉积方式。鄂尔多斯盆地延长组的现场观测和与深海对应物的比较支持浊流的发生。