SEDIMENTOLOGICAL SIGNIFICANCE OF NATURAL GAMMA RAY LOGGING DATA OF MARINE CARBONATE: A CASE OF THE WELL L1 OF QINGXUDONG FORMATION, LOWER CAMBRIAN IN SOUTHEAST SICHUAN BASIN
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摘要: 层序界面和最大海泛面在Th、K和U曲线上明显偏移,利用Th/U及Th/K曲线的旋回性可进一步详细划分层序地层。Th/U比值与氧化-还原条件和古水深存在良好的相关性,Th/U比值减小代表还原性增强、水体加深。Th/K比值是反映沉积物是否处于暴露环境的重要指示参数。黏土矿物图版可定性分析黏土矿物类型及其含量变化,不同的黏土矿物组合代表不同的古气候。利用L1井自然伽马能谱测井曲线和图版的变化特征可以恢复清虚洞期古沉积环境的演变,由sq1期到sq4期,水体逐渐变浅,氧化性具增强趋势,干旱性基本稳定,沉积相由潮下低能逐渐演变为潮上蒸发坪。Abstract: Sequence interfaces and the maximum flooding surface are obviously observed in the U, Th, K curves. Therefore, the Th/U and Th/K curves can be applied for detailed subdivision of sequences. Changes in Th/U ratio are well associated with water depth and oxidation-reduction conditions. The low Th/U ratio indicates deepening of water depth and increasing in reducibility. The value of Th/K ratio is also an indicator to the exposure time of sediments in a weathering environment. Using the clay mineral chart, we may qualitatively determine the types of clay minerals and the changes in content. The changes in clay mineral assemblage are usually regarded as the responses to climatic changes. The natural gamma logging curve and the clay mineral chart of the well L1 are applied in this paper to recover the evolution of the sedimentary environment in the Qingxudong period, from sq1 to sq4. It suggests that the water became shallower gradually, the oxidation was increasing, drought remained stable, and the sedimentary facies gradually evolved from a low-energy subtidal zone to supratidal evaporates in this period.
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