云南大理盆地隐仙溪冲积扇沉积结构特征

doi:10.3863/j.issn.1000-2634.2006.05.001

西南石油大学学报(自然科学版) ›› 2006, Vol. 28 ›› Issue (5): 1-5.DOI: 10.3863/j.issn.1000-2634.2006.05.001

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云南大理盆地隐仙溪冲积扇沉积结构特征

程立华^１陈世悦^２吴胜和^１姜在兴³ 杨伟力⁴袁文芳^2

1.中国石油大学资源与信息学院，北京 102249； 2.中国石油大学(华东)； 3.中国地质大学； 4. 中国科学院广州地球化学研究所

收稿日期:2005-09-26 修回日期:1900-01-01 出版日期:2006-10-20 发布日期:2006-10-20
通讯作者: 程立华

SEDIMENTARY TEXTURE CHARACTERISTIC IN THE ALLUVIAL FAN IN DALI BASIN

CHENG Li-hua^１ CHEN Shi-yue^２ WU sheng-he^１ et al

Faculty of Geoscience & Information Tology, China University of Petroleum, Beijing 102249, China

Received:2005-09-26 Revised:1900-01-01 Online:2006-10-20 Published:2006-10-20
Contact: CHENG Li-hua

摘要/Abstract

摘要： 隐仙溪扇体发育于大理盆地洱海西岸点苍山山前，扇体扇面坡度差别较大，内扇为10°，中扇6°，外扇2°，纵剖面呈下凹的楔形。通过野外观测及室内分析，将扇体沉积物划分为混杂堆积泥石相、无泥质砂砾石相、筛状沉积相和漂砾相，并对扇体不同亚相沉积物粒度分布特征进行对比分析，深入探讨了扇体沉积物粒度变化规律。认为其具有自内扇向外扇呈辐射状减小的趋势，且在根部粒度递减率高，向外递减率逐渐变低，这一变化规律可用对数函数曲线进行较好的拟合。为认识冲积扇储层砂体的空间构型及三维储层建模提供了依据

关键词: 隐仙溪扇体, 沉积结构, 粒度分布, 函数拟合

Abstract: The alluvial fan of Yinxian stream is located between Erhai Lake and Diancang Mountain, in the Dali Basin, Yunnan province, which is 2.5km far from ancient Dali city. The surface gradient of the fan ranges from 10°at inner fan, to 6°at middle fan and 2° at outer fan. On the basis of field observation and indoor analysis, the sediment of the fan is classified into four kinds of lithofacies, i.e., intermixed mudrock facies, sandconglomerate facies without mud, cribrose lithofacies and boulder facies. At the same time, the sedimentsize ingredient of each subfacies is analyzed contrastively and the sedimentsize variation law of the whole fan is analyzed in detail, which shows a radial decrease in the grain size from proximal to distal fan with the gradually diminishing velocity. This decreasing law can be fitted well by logarithm curve.

Key words: the fan of Yinxianxi, sedimentary texture, grain size distribution, function matching, Dali Basin, Yunnan

中图分类号:

程立华陈世悦吴胜和姜在兴杨伟力袁文芳. 云南大理盆地隐仙溪冲积扇沉积结构特征[J]. 西南石油大学学报(自然科学版), 2006, 28(5): 1-5.

CHENG Li-hua CHEN Shi-yue WU sheng-he et al. SEDIMENTARY TEXTURE CHARACTERISTIC IN THE ALLUVIAL FAN IN DALI BASIN[J]. 西南石油大学学报(自然科学版), 2006, 28(5): 1-5.

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云南大理盆地隐仙溪冲积扇沉积结构特征

SEDIMENTARY TEXTURE CHARACTERISTIC IN THE ALLUVIAL FAN IN DALI BASIN

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