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中国白垩纪大陆科学钻探松科1井南孔连续取姚家组岩心长157.67m,岩心收获率为99.96%。上白垩统姚家组对应着三冬阶和坎潘阶下部。松科1井南孔姚家组岩心的精细描述,揭示其岩性-岩相-旋回的沉积序列及其过程。姚家组中可识别基本岩石类型11种,相类型为浅湖、半深湖和三角洲前缘3种亚相,白云岩沉积、泥质灰岩沉积、浅湖和深湖浊流沉积、河口坝、远砂坝、席状砂、分流间湾、水下滑塌沉积、浅湖和深湖静水泥沉积11种沉积微相。姚家组可识别的米级旋回(六级旋回)有8种类型,可划分出151个米级旋回。这些米级旋回叠加成45个五级旋回、9个四级旋回和3个三级旋回。完整组段厘米级刻画为高精度沉积过程研究提供了可能。姚家组红层厚度占姚家组总厚度的43%,作为该时期已被揭示的全球为数不多的陆相红层之一,厘米级刻画的姚家组大套陆相红层为全球白垩纪富氧事件研究提供了可能的立典剖面。
China Cretaceous Continental Scientific Drilling Songke 1 South hole continuous take Yaojiu core length 157.67m, core yield was 99.96%. The Upper Cretaceous Yaojia Formation corresponds to the lower part of the Three Winter and Campanian steps. A detailed description of the core of the Yaojia Formation in the Nongkong-Kong Section of the Songke-1 well revealed the lithologic-lithofacies-cycle sedimentary sequence and its process. There are 11 basic rock types in Yaojia Formation, with three types of shallow lakes, semi-deep lakes and delta front, dolomite sediments, mudstone limestone sediments, shallow and deep lake turbidite sediments, estuaries 11 types of sedimentary microfacies, such as dams, far sand bars, sand sheets, shunt bay, underwater slump deposit, shallow lake and deep lake static cement deposition. There are eight types of Mi-level cycles (six-stage cycles) recognized by Yao’s group, which can be divided into 151-meter cycles. These meter-level cycles stack up to 45 5th-order cycles, 9 4th-cycle and 3 3rd-cycle cycles. The centimeter-level characterization of a complete set of segments provides the possibility for high-precision deposition studies. The thickness of the red layer in the Yaojia Formation accounts for 43% of the total thickness of the Yaojia Formation. As one of the few terrestrial red layers in the world that has been revealed during this period, the large continental facies red layer of the centimeter-level Yaojia Formation is the global Cretaceous- Event research provides a possible classical profile.