湖相页岩液态烃对页岩吸附气实验的影响——以鄂尔多斯盆地延长组页岩为例

刘国恒; 黄志龙; 姜振学; 陈践发; 陈斐然; 邢金艳

doi:10.11781/sysydz201505648

湖相页岩液态烃对页岩吸附气实验的影响——以鄂尔多斯盆地延长组页岩为例

doi: 10.11781/sysydz201505648

1.
中国石油大学油气资源与探测国家重点实验室, 北京 102249
2. 中国石油大学非常规天然气研究院, 北京 102249

基金项目: 国家自然科学基金项目"湖相富有机质页岩自生石英形成及其页岩油地质意义"(41272156)资助。

详细信息

作者简介:
刘国恒(1988—),男,博士研究生,从事油气藏形成与分布研究。E-mail:liuguoheng123@sina.cn。

通讯作者:
黄志龙(1962—),男,教授,博士生导师,从事石油地质研究。E-mail:huang5288@163.com。

中图分类号: TE135
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出版历程
- 收稿日期: 2014-08-12
- 修回日期: 2015-07-21
- 刊出日期: 2015-09-28

Effect of liquid hydrocarbons on gas adsorption in alacustrine shale: A case study of the Yanchang Formation, Ordos Basin

1.
State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China
2. Unconventional Natural Gas Institute, China University of Petroleum, Beijing 102249, China

摘要

摘要: 通过全岩和黏土矿物X-衍射、索氏抽提、离子抛光、扫描电镜、低温氮气吸附、等温吸附等实验分析,研究了鄂尔多斯盆地延长组湖相页岩储层中的液态烃对吸附气含量的影响。结果表明,延长组湖相页岩储层正处于中成岩阶段A期;有机质演化程度相对较低,不足以形成大量的有机质孔隙,却足以形成大量的液态烃,液态烃占据了页岩中直径约4 nm左右的孔隙。由于氮气不溶于液态烃,而甲烷易溶解于液态烃,使得抽提前后样品低温氮气吸附实验得到的比表面积和吸附量变化大,但抽提前后样品等温吸附实验测得的甲烷"吸附"量变化不大,这表明等温吸附实验中有一部分甲烷以溶解态赋存于页岩样品中。因此在用等温吸附实验研究低成熟度页岩吸附气含量的过程中,必须注意液态烃的影响。
- 液态烃 /
- 吸附气 /
- 甲烷溶解 /
- 低成熟度页岩 /
- 延长组 /
- 鄂尔多斯盆地
Abstract: The effect of liquid hydrocarbons on the gas adsorption capacity of lacustrine shales from the Yanchang Formation in the Ordos Basin has been studied using a series of integrated experimental methods including X-ray diffraction of bulk and clay minerals, Soxhlet extraction, focused ion beam scanning electron microscopy(FIB-SEM), low-temperature N₂ adsorption and high-pressure CH₄ adsorption methods.The results show that the lacustrine shale from the Yanchang Formation is in the middle diagenetic stage A.The thermal maturity is relatively low, and contributes to the absence of organic matter pores.However, it is sufficiently high enough forthe production of liquid hydrocarbons which can block up pores with a diameter of 4 nm.Methane can dissolve in these liquid hydrocarbon, whereas nitrogen cannot.As a result, the specific area and adsorbed capacity acquired in low-temperature N₂ adsorption analysis show great differences between samples before and after extraction.However, the difference does not exist in the CH₄ adsorption analysis.This means that a certain proportion of CH₄ exists in these samples in a dissolved form.It is necessary to pay attention to free hydrocarbons during studies of gas adsorption capacity of shales with low thermal maturity usinghigh pressure CH₄ adsorption methods.
- liquid hydrocarbons /
- adsorbed gas /
- methane dissolution /
- shale with low thermal maturity /
- Yanchang Formation /
- Ordos Basin

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