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基于层序地层单元形成过程中古气候环境及其控制下的湖平面突变面,以及层序单元中岩石粘土矿物、微量元素、镜质体反射率等微观参数突变面具有良好响应的原理,通过开展四川盆地上三叠统须家河组实测野外地质剖面、地震剖面、电测曲线等常规识别方法,结合野外自然伽玛数据测量、岩石地球化学特征等微观综合识别层序界面方法,最终在四川盆地上三叠统须家河组地层中识别出7个层序界面,据此划分为6个三级层序。为减少层序地层研究中依靠人为经验识别层序界面的随意性,探索建立综合识别层序界面,对建立划分层序格架的精确方法提供新的尝试。
Based on the principle that the paleoclimate environment and the abrupt surface of the lake plane under the control of the paleoclimate environment and the catastrophic change of microcosmic parameters such as the rock clay mineral, trace element and vitrinite reflectance in the sequence unit have a good response, In the Upper Triassic Xujiahe Formation in Sichuan Basin, conventional identification methods such as field geologic profile, seismic profile and electrical measuring curve are combined with microscopic comprehensive identification sequence interface method of field natural gamma ray data and lithogeochemical characteristics. Finally, Seven stratigraphic boundaries were identified in the Upper Triassic Xujiahe Formation in the basin, and are divided into six third-order sequences. In order to reduce the randomness of identifying sequence boundaries by using human experience in the study of sequence stratigraphy, we explore the establishment of comprehensive recognition sequence interfaces and provide new attempts to establish an accurate method of delineating the sequence framework.