国家冰川冻土沙漠科学数据中心

元数据

名称	Early development and late preservation of porosity linked to presence of hydrocarbons in Precambrian microbialite gas reservoirs within the Sichuan Basin, southern China
科技资源标识	CSTR:11738.14.NCDC.XDA14.PP5721.2024
DOI	10.1016/j.precamres.2020.105694
数据共享方式	开放下载
摘要	The ancient Ediacaran Dengying Formation consists of microbialites with unusually high porosity that represent a large proportion of the Weiyuan-Anyue gas reservoirs in southwestern China’s Sichuan Basin. However, a clear model for the development and preservation of these microbialite reservoirs has yet not been determined. We used samples from outcrops and borehole cores to characterize these microbialites and propose a model for early development and subsequent reservation of their porosity. Primary porosity in the microbialite framework was mainly represented by fenestrate vugs and elongated cavities between microbial layers that were formed during initial sedimentation as well as secondary karst vugs and caves formed by meteoric karst resulting from subsequent tectonic uplift; these features represent the early development of the microbialite reservoirs. Subsequent filling of vugs by early-stage radial dolomite (RD) and late-stage saddle dolomite (SD) occurred during the deep burial stage, with δ18O and homogenization temperature patterns suggesting continuous cementation. However, most vugs were not cemented due to combination of (1) a rigid dolomitized framework, (2) a closed burial system restricting the flow of mineralized fluid, (3) the presence of petroleum or pyrobitumen, and (4) acidic fluid conditions related to high concentrations of H2S and CO2. The third and fourth factors were linked to presence of hydrocarbons and had made big contribution to porosity retention during deep burial diagenetic stage.
学科分类	170.50
关键词	Porosity preservation Thrombolite Microbialite Dengying formation Sichuan Basin
作者	Dongya Zhu,Quanyou Liu,Zhiliang He,Qian Ding,Jingbin Wang
数据量	14.7 MiB
论文类型：	journal
论文网址：	https://www.sciencedirect.com/science/article/pii/S0301926819306485
期刊名称：	Precambrian Research
出版时间：	2020-06-15

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数据引用

Dongya Zhu,Quanyou Liu,Zhiliang He,Qian Ding,Jingbin Wang. Early development and late preservation of porosity linked to presence of hydrocarbons in Precambrian microbialite gas reservoirs within the Sichuan Basin, southern China. 国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn), 2024. https://cstr.cn/CSTR:11738.14.NCDC.XDA14.PP5721.2024.

许可协议

本作品采用知识共享署名 4.0 国际许可协议进行许可。

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项目信息详情

项目名称：深层油气形成与分布预测
项目编号：XDA14010000
项目类别：中国科学院战略性先导科技专项（A类）