四川盆地平桥地区五峰—龙马溪组页岩微观孔隙特征研究

王运海

doi:10.11781/sysydz201803337

四川盆地平桥地区五峰—龙马溪组页岩微观孔隙特征研究

doi: 10.11781/sysydz201803337

王运海

中国石化华东油气分公司, 南京 210011

基金项目: 国家科技重大专项项目（2016ZX05061）“彭水地区常压页岩气勘探开发示范工程”资助。

详细信息

作者简介:
王运海(1975-),男,硕士,高级工程师,从事油气田地质与开发工作。E-mail:wyunhai@126.com。

中图分类号: TE122.23
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出版历程
- 收稿日期: 2018-02-08
- 修回日期: 2018-05-10
- 刊出日期: 2018-05-28

Micro-pore characteristics of shale from Wufeng-Longmaxi formations in Pingqiao area, Sichuan Basin

WANG Yunhai

SINOPEC East China Branch Company, Nanjing, Jiangsu 210011

摘要

摘要: 基于氩离子抛光扫描电镜、吸附脱附实验等方法，对四川盆地平桥地区五峰组-龙马溪组下部页岩微观孔隙进行了研究。结果表明，富有机质的硅质页岩和碳质页岩微观孔隙以有机孔和微裂缝为主；孔隙结构相对复杂，孔隙形态丰富，孔径范围较大。吸附脱附实验显示，该页岩既有狭窄的平行板片状孔、少量的锥形平板孔和楔形孔，孔隙连通性相对差，又有规则开放圆孔与一端开口的墨水瓶状孔，孔隙开放性、连通性相对好。氩离子抛光扫描电镜法测量有机孔以细介孔为主且偏向微孔；吸附法测量比表面积为9～32.6 m²/g，平均18.0 m²/g，值偏低，BET法孔径为3.23～4.35 nm，BJH法孔容平均0.016 5 cm³/g，以细介孔为主，且偏向微孔界线。综合分析认为，研究区页岩储层微观孔隙以细介孔为主，且介孔和微孔贡献了绝大部分的比表面积。
- 孔隙类型 /
- 孔隙结构 /
- 页岩 /
- 五峰-龙马溪组 /
- 四川盆地
Abstract: The microscopic pore characteristics of shale from the lower Wufeng-Longmaxi formations in the Pingqiao area of the Sichuan Basin were studied using argon ion polished sample scanning electron microscopy and nitrogen adsorption-desorption experiments. Organic-rich siliceous shale and carbonaceous shale micro-pores are dominated by organic pores and micro-cracks. The pore structure is relatively complex, with rich pore morphology and a wide range of pore sizes. Argon ion polishing scanning electron microscopy showed that the organic pores are mainly thin and partly belong to micro-pores. Nitrogen adsorption-desorption experiments showed that the shale has narrow parallel plate-like holes, a small number of conical plate holes and wedge-shaped holes with a poor connectivity, and regular open round holes and ink bottle-shaped holes with open ends. The specific surface area measured by nitrogen adsorption-desorption experiments was 9-32.6 m²/g, with an average of 18.0 m²/g, which was low. The pore diameters measured by the BET method were 3.23 to 4.35 nm, and the average pore volume by the BJH method was 0.016 5 cm³/g. The fine meso-pores were dominant, and they were biased toward the micro-pore boundary. According to the comprehensive analysis, the microscopic pores of shale reservoirs in the study area are mainly mesoporous, and meso-pores and micro-pores contribute most of the specific surface area.
- pore type /
- pore structure /
- shale /
- Wufeng-Longmaxi formations /
- Sichuan Basin

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