人工熟化过程中可溶有机质对页岩孔隙特征的影响
Effect of extractable organic matter on pore characteristics of shales treated by artificial heating
查看参考文献37篇
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文摘
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有机质成熟过程中,可溶有机质在页岩中赋存状态的演化规律对于深入了解页岩油气的储集空间具有重要意义。采用压机半封闭体系,对低成熟的鄂尔多斯长7段页岩进行了不同温度条件下的高压热模拟实验研究,获取了一系列成熟度梯度(0.7% 2.0%)差异较小且相对稳定;可溶有机质对微孔的影响可能以覆盖遮掩为主,对页岩孔体积的影响主要集中在介孔和大孔部分,但对页岩比表面积的影响主要集中在微孔和介孔范围。 |
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其他语种文摘
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Extractable organic matter in shales has great significance to shale gas reservoirs during thermal maturation. A semi-closed thermal simulation was conducted on Chang-7 shales at different temperatures to acquire a set of shale samples at a thermal gradiant range from VRo = 0.7% to VRo = 3.5%. And extractable organic matter is characterized according to the comparison study of the shale pore characteristics investigated by low-pressure N_2 and CO_2 adsorption techniques on different scales before and after solvent extraction. The results show that the TOC,S_1, S_2 and I_H of the extracted samples tend to decrease significantly with increasing maturity until VRo = 2.0%, then generally become stable at higher maturation level. Solvent extraction may cover the micro-pores mainly and dramatically enhance the volumes of meso- and macro-pores, but only slightly enhance the micro-pore volume. In comparison, the increase of specific surface area after solvent extraction may be mostly contributed by micro-pores, and then by meso-pores. |
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来源
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地球化学
,2017,46(5):466-475 【核心库】
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关键词
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长7段页岩
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高温高压模拟实验
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可溶有机质
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成熟度
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孔隙特征
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地址
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中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广东, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学 |
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基金
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中国科学院战略性先导科技专项
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国家973计划
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文献收藏号
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CSCD:6061600
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