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  • 2024-01-08
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名   称 Factors influencing stylolite formation in the Cambrian Longwangmiao Formation, Sichuan Basin, SW China
科技资源标识 CSTR:11738.14.NCDC.XDA14.PP5962.2024
DOI https://doi.org/10.1016/j.petrol.2022.110946
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摘   要 In the deep and ultra-deep carbonate reservoirs, the porosity will be reduced due to the compaction, pressure
solution, and cementation which are considered as the crucial factors for the mechanism of high-quality carbonate
reservoirs. However, it is still a challenge to quantify the influence of stylolites on the Longwangmiao
Formation carbonate reservoirs. To better understand the controls on the formation and distribution of stylolites,
the Longwangmiao Formation is selected as an example to evaluate the effect of stylolites on the carbonate
reservoirs. The mineralogy of the Longwangmiao Formation reservoirs is mainly dominated by dolomite (79.6%)
with minor calcite (11.4%), and terrigenous minerals (clay and quartz) (5.6%). The rocks with dolomite content
of more than 80%, calcite content of less than 30%, and terrigenous minerals of less than 1% have lower stylolite
density and amplitude. The content of dolomite can affect the occurrence of stylolite indicating that the higher
abundance of dolomite has a lower density and amplitude of stylolite. Based on the multiple techniques, four
types of carbonate lithofacies were recognized, including the grainstone (dolo-grainstone, grainstone), packstone
(dolo-packstone, packstone), wackestone (dolo-wackestone, wackestone), and mudstone (dolo-mudstone,
mudstone). The distribution of stylolite also shows the lithofacies-specific behavior in the Longwangmiao Formation
carbonate reservoirs. The lithofacies of grainstone shows the lowest density and amplitude of stylolite,
while the occurrence of stylolite in the mudstone shows the highest abundance. Vertically, the stylolite density
and amplitude in the lower part of the fourth-order sequences is higher than this in the upper part. This study
suggested that the dolomitized lithofacies with relatively high grain (50–70%) and cement (~25%) contents can
resist the pressure solution and can preserve the porosity of carbonate reservoirs.
学科分类
170.50
关键词
Pressure solution Stylolite Quantitative analysis Sichuan Basin Longwangmiao Formation
作者 Weiqiang Yang,Huayao Zou,Ting Li,Liwen Hu,Chengkun Deng,Zhongzhen Chen,Caijun Lan,Zhehang Xu,Haoru Chen,Chaojin Lu,Pingping Li
data size 14.6 MiB
论文类型： journal
论文网址： https://www.sciencedirect.com/science/article/pii/S0920410522008014
期刊名称： Journal of Petroleum Science and Engineering
出版时间： 2022-11-01
引用和标注
Data reference
Weiqiang Yang,Huayao Zou,Ting Li,Liwen Hu,Chengkun Deng,Zhongzhen Chen,Caijun Lan,Zhehang Xu,Haoru Chen,Chaojin Lu,Pingping Li. Factors influencing stylolite formation in the Cambrian Longwangmiao Formation, Sichuan Basin, SW China. National Cryosphere Desert Data Center(http://www.ncdc.ac.cn), 2024. https://cstr.cn/CSTR:11738.14.NCDC.XDA14.PP5962.2024.
Weiqiang Yang,Huayao Zou,Ting Li,Liwen Hu,Chengkun Deng,Zhongzhen Chen,Caijun Lan,Zhehang Xu,Haoru Chen,Chaojin Lu,Pingping Li. Factors influencing stylolite formation in the Cambrian Longwangmiao Formation, Sichuan Basin, SW China. National Cryosphere Desert Data Center(http://www.ncdc.ac.cn), 2024. https://www.doi.org/https://doi.org/10.1016/j.petrol.2022.110946.
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