贵州南部晚石炭世沉积环境与古地理特征

苑坤; 陈榕; 林拓; 方欣欣; 覃英伦; 王超; 周志; 孙相灿

doi:10.11781/sysydz201901038

贵州南部晚石炭世沉积环境与古地理特征

doi: 10.11781/sysydz201901038

苑坤¹,
陈榕¹,
林拓¹,
方欣欣^2, ,,
覃英伦¹,
王超¹,
周志¹,
孙相灿¹

1. 中国地质调查局油气资源调查中心, 北京 100083;
2. 中国地质科学院地质力学研究所, 北京 100081

基金项目:

国家科技重大专项“不同类型页岩气生成机理与富集规律研究”（2016ZX05034-001）和中国地质调查局项目“滇黔桂上古生界页岩气战略选区调查”（DD20160196）资助。

详细信息

作者简介:
苑坤(1985-),男,硕士,工程师,从事页岩气战略选区调查与评价研究。E-mail:cheerlist@qq.com。

通讯作者:
方欣欣(1981-),女,博士,工程师,从事油气资源调查与储层预测研究。E-mail:freestarxin@163.com。

中图分类号: TE121.3
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出版历程
- 收稿日期: 2018-09-19
- 修回日期: 2018-12-03
- 刊出日期: 2019-01-28

Petrological characteristics and sedimentary environment in the southern Guizhou during the Late Carboniferous

1. Oil & Gas Survey Center, China Geological Survey, Beijing 100083, China;
2. Institute of Geomechanics, Chinese Academy of Geological Science, Beijing 100081, China

摘要

摘要: 晚石炭世滇黔桂地区整体处于台盆相间格局，盆地相与台地相的特征共存。贵州南部作为台盆相带变化的典型地区，同时发育有南丹组和威宁组2种岩性组合，其中南丹组为黑色灰岩、燧石灰岩夹硅质岩，威宁组为浅灰色灰岩夹白云岩；由于缺乏地下资料，二者的界线、沉积特征及过渡关系一直不清。为此，在前人研究成果及该区3口钻井分析的基础上，采用沉积学、岩石学等方法，结合室内薄片、碳酸盐岩分析等多种手段，通过对比钻井沉积序列、生物化石及岩石组合特征，对贵州南部地区沉积相带的变化及过渡关系进行了分析和讨论。晚石炭世贵州南部贵州南部具有自碳酸盐台地边缘藻滩、碳酸盐上斜坡、中斜坡、下斜坡到台盆相的不同相带沉积特点，整体表现为一向南西方向的海退过程，且各相带存在一定的交叉与过渡。贵州南部的北部地区威宁组的出现，指示了海水的变浅和裂陷槽的封闭。
- 碳酸盐岩 /
- 沉积环境 /
- 南丹组 /
- 威宁组 /
- 贵州南部
Abstract: The sedimentary environment changed frequently from carbonate terraces to basin in the Late Carboniferous in the south part of Guizhou. There were two lithologic combinations at the same time, namely the Nandan Formation (black limestones and siliceous shale limestones) and the Weining Formation (light gray limestones and dolomites). However, the sedimentary environment boundary and transitional characteristics between the two formations are not clear yet. The changes and transition characteristics of sedimentary facies in the southern Guizhou were analyzed based on previous research and the analysis of three typical wells, and combined with sedimentary sequence characteristics and rock combination characteristics. It was found that in the Late Carboniferous, the southern part of Guizhou experienced a retreat from basin facies to carbonate terraces facies, and there was a certain intersection and transition between various facies. A retreat process took place in the south-west direction. The appearance of the Weining Formation in the south indicated the shallowing of seawater and the closure of a rift trough.
- carbonate /
- sedimentary environment /
- Nandan Formation /
- Weining Formation /
- south of Guizhou Province

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