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中国白垩纪大陆科学钻探松科1井南孔连续取青山口组一段岩心81.41m,收获率为100%。青一段沉积时期应与土仑阶对应。通过对松科1井南孔青一段岩心的精细描述,揭示其岩性-岩相-旋回的沉积序列及其过程。青一段识别出6种岩石类型(泥岩、白云岩、泥灰岩、重结晶灰岩、介形虫灰岩和火山灰)。相类型为深湖亚相以及白云岩沉积、泥灰岩沉积、灰岩沉积、深湖浊流沉积、火山灰沉积和深湖静水泥沉积共6种沉积微相。青一段中可识别的米级旋回(六级旋回)有4种类型,可划分出81个米级旋回。这些米级旋回叠加成25个五级旋回、6个四级旋回,识别出1个三级旋回界面。对青山口组一段暗色泥岩、白云岩、火山灰等特殊事件层的精细刻画对于松辽盆地的缺氧事件、烃源岩、湖海沟通事件研究具有重要意义。
The Cretaceous Continental Scientific Drilling Songke-1 South Passage continuously took the core of the Qingshankou Formation 81.41m with a yield of 100%. Green period of deposition should correspond with the Turon order. A detailed description of the core of the Nankongqing section of Songke-1 well reveals its lithologic-lithofacies-cycle sedimentary sequence and its process. The first section identified six rock types (mudstone, dolomite, marl, recrystallized limestone, ostracite and pozzolan). There are 6 sedimentary microfacies including deep lake subfacies, dolomite sediments, marl sediments, limestone sediments, deep lake turbidite sediments, volcanic ash deposits and deep lake static cement deposits. There are 4 types of mi-level cycles (six-stage cycles) that can be identified in the Green section, which can be divided into 81-meter cycles. These Mi-level cycles stack up to 25 fifth-order cycles, six fourth-level cycles, and identify a third-level cycle interface. The fine characterization of the first member of the Qingshankou Formation such as dark mudstone, dolomite and volcanic ash is of great significance for the study of anoxic events, hydrocarbon source rocks and the lacustrine communications in the Songliao Basin.