人工熟化过程中可溶有机质对页岩孔隙特征的影响

发布时间：2018-04-14 21:59

本文选题：长段页岩 + 高温高压模拟实验　；参考：《地球化学》2017年05期

【摘要】：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%VRo3.5%)的页岩样品。通过混合溶剂(CH_2CL_2㑳CH_3OH=93㑳7)进行索氏抽提,结合低压N_2和CO_2气体吸附实验对抽提前后页岩孔隙特征进行了对比研究,得出以下认识:去除可溶有机质的页岩的TOC含量、吸附烃S_1、热解烃S_2、氢指数IH在成熟阶段(VRo2.0%)都有明显的降低,但在过成熟阶段(VRo2.0%)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。
[Abstract]:In the process of maturation of organic matter, the evolution of soluble organic matter in shale plays an important role in understanding the reservoir space of shale oil and gas.A series of shale samples with maturity gradient (0.7V Ro3.5V) were obtained by using semi-closed press system to study the high pressure thermal simulation of low mature Ordos Chang 7 shale under different temperature conditions.The pore characteristics of shale before and after extraction were studied in combination with the experiments of low pressure N-2 and CO_2 gas adsorption.Adsorption hydrocarbon S1, pyrolytic hydrocarbon S-2, hydrogen index IH decreased obviously in mature stage, but in over-mature stage, the difference was small and relatively stable, and the effect of soluble organic matter on micropore may be mainly covered and masked.The effect on the pore volume of shale is mainly concentrated in the mesoporous and mesoporous parts, but the effect on the specific surface area of shale is mainly in the micropore and mesoporous range.
【作者单位】：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;中国科学院大学;
【基金】：中国科学院战略性先导科技专项(B类)(CDB10010300) 国家重点基础研究发展计划项目(2012CB214703)
【分类号】：P618.13

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