Pyrite morphological evidence for sedimentary conditions of the Wufeng formation–Longmaxi formation in south-east Chongqing area–insights for high-quality shale gas reservoir formation mechanism

IF 1.9 4区工程技术 Q4 ENERGY & FUELS

Energy Exploration & Exploitation Pub Date : 2024-03-28 DOI:10.1177/01445987231220962

Difei Zhao, Qinxia Wang, Zhibo Zhang, Yuelin Zhao, Jiaming Zhang, Dandan Liu, Shengxiu Wang, Junkai Yin, Yinghai Guo, Geoff Wang

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Abstract

As one of the important minerals in marine shale reservoirs, the development characteristics of pyrite can provide guidance for the exploration of deep shale gas resources and the study of high-quality reservoir development mechanisms. In this study, samples of the Wufeng and Longmaxi Formation in the southeast Chongqing area were selected, and the development characteristics of framboidal pyrite were revealed through a combination of qualitative and quantitative method. High-quality reservoirs of the upper Wufeng Formation and the bottom of the Longmaxi Formation are developed with smaller sizes, weaker variation and a narrower size distribution of pyrite framboids compared with other units of the strata, suggesting relatively stable euxinic conditions during deposition. The development characteristics of framboidal pyrite and some of the key reservoir evaluation parameters such as organic matter content and brittle mineral content, etc., are controlled by similar factors. Therefore, pyrite morphological evidence can be used as a potential indicator of high-quality shale reservoirs.

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重庆东南部五峰地层-龙马溪地层沉积条件的黄铁矿形态证据--优质页岩气储层形成机理的启示

黄铁矿作为海相页岩储层中的重要矿物之一，其发育特征可为深层页岩气资源勘探和优质储层发育机理研究提供指导。本研究选取重庆东南地区五峰、龙马溪地层样品，通过定性与定量相结合的方法，揭示了框架黄铁矿的发育特征。与其他地层单元相比，五峰地层上部和龙马溪地层底部的优质储层黄铁矿框格发育，黄铁矿框格粒径较小，变化较弱，粒径分布较窄，表明沉积过程中蚀变条件相对稳定。黄铁矿框架体的发育特征与储层评价的一些关键参数（如有机质含量和脆性矿物含量等）受类似因素的控制。因此，黄铁矿形态证据可作为优质页岩储层的潜在指标。

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来源期刊

Energy Exploration & Exploitation 工程技术-能源与燃料

CiteScore

5.40

自引率

3.70%

发文量

审稿时长

3.9 months

期刊介绍： Energy Exploration & Exploitation is a peer-reviewed, open access journal that provides up-to-date, informative reviews and original articles on important issues in the exploration, exploitation, use and economics of the world’s energy resources.