摘要
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。
Seven sequence boundaries in the upper Triassic Xujiahe Formation of Sichuan basin were identified based on actual measurement of geological cross sections, seismic profile, electrical measuring curves and microscopic integrated identification of sequence boundary, such as field measured gamma data and rock geochemistry; because the good reflection between the abrupt lake changes controlled by paleoclimate and microcosmic information of clay mineral, trace element, vitrinite reflectance（R0） in the sequence unit during the formation of sequence units. Thus,the six third-rank sequences were classified. This research result will try to reduce the artificially empirical randomness in identifying the sequence boundary,and setup the integrated identification the sequence boundary and the precise classification of the sequence framework.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2010年第1期78-86,共9页
Natural Gas Geoscience
基金
国家科技重大专项(编号:2008ZX05001-002)
中国博士后科学基金(编号:20090460390)联合资助
关键词
层序界面
露头
自然伽玛
岩石地球化学
Sequence boundary
Outcrop
Natural gammaray spectral
Rock geochemistry.
