海相碳酸盐岩自然伽马能谱测井资料的沉积学意义——以川东南L1井下寒武统清虚洞组为例

冯伟明; 谢渊; 刘建清; 林家善; 陈果; 赵瞻

doi:10.16562/j.cnki.0256-1492.2016.05.017

海相碳酸盐岩自然伽马能谱测井资料的沉积学意义——以川东南L1井下寒武统清虚洞组为例

冯伟明^1,2,
谢渊^1,2,
刘建清^1,2,
林家善^1,2,
陈果³,
赵瞻^1,2

1. 中国地质调查局成都地质调查中心, 成都 610081;
2. 国土资源部沉积盆地与油气资源重点实验室, 成都 610081;
3. 中石油川庆钻探工程公司地质勘探开发研究院, 成都 610051

基金项目:

中国地质调查局攻关项目(1212010782003)；中国地质调查局陆域能源调查计划项目(12120115004101)；国土资源部成都地质矿产研究所所控青年基金([所基控]2014-02)

详细信息

作者简介:
冯伟明(1986-),男,工程师,从事沉积地质和石油地质调查与研究工作,E-mail:fengweiming009@163.com

中图分类号: P631.8
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- 文章访问数: 1881
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出版历程
- 收稿日期: 2015-09-22
- 修回日期: 2016-01-04

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

1. Chengdu Institute of Geology and Mineral Resources, Chengdu 610081;
2. Key Laboratory for Sedimentary Basin and Oil and Gas Resources, Ministry of Land and Resources, Chengdu 610081;
3. CCDC Geological Exploration & Development Research Institute, Chengdu 610051

摘要

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。
- 自然伽马能谱测井 /
- 沉积环境 /
- 沉积旋回 /
- 碳酸盐岩 /
- 清虚洞组
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.
- natural gamma logging /
- depositional environment /
- sedimentary cycle /
- carbonate rocks /
- Qingxudong Formation

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