富有机质页岩有机孔隙形成与演化的热模拟实验

发布时间：2018-03-13 20:31

本文选题：页岩　切入点：有机孔隙　出处：《石油学报》2017年01期 　论文类型：期刊论文

【摘要】：针对页岩有机孔隙的形成与演化,开展了从未熟—低熟—成熟—高成熟—过成熟全系列的地质条件约束下的成岩成烃演化热模拟实验,利用氩离子抛光-场发射扫描电镜对原始样品和模拟不同演化阶段反应后的样品进行了微观特征分析,研究表明:1未熟、低熟阶段生物化学作用和低温热作用生烃过程中可以形成有机孔隙,其当时较浅的埋深可能有助于有机孔隙的保存;2有机孔隙的形成与演变具有非均质性,成熟度不是控制有机孔隙形成与发育的决定性因素,有机质物理化学结构的差异对有机孔隙的形成与演化具有重要作用;3有机孔隙的发育与滞留油具有明显的相关性,生油阶段生成的有机孔隙,易被热解沥青所占据;4有机质收缩缝/有机质边缘孔可能是页岩气赋存的重要空间,其发育主要受控于在从"化学吸附有机质"向"物理吸附有机质"和"游离有机质"转化时有机质的物理化学结构及演化程度。
[Abstract]:In view of the formation and evolution of organic pores in shale, thermal simulation experiments of diagenetic hydrocarbon evolution were carried out under the constraints of geological conditions of the whole series of never maturing, low maturing, high maturation and over maturation. Using argon ion polishing and field emission scanning electron microscopy (SEM), the microcosmic characteristics of the original sample and the sample after simulating the reaction at different evolution stages were analyzed. Organic pores can be formed in the process of biochemistry and low-temperature thermal hydrocarbon generation at low maturity stage. The shallow buried depth at that time may contribute to the formation and evolution of organic pores in the preservation of organic pores, and the formation and evolution of organic pores have heterogeneity. Maturity is not the decisive factor to control the formation and development of organic pores. The difference of physical and chemical structure of organic matter plays an important role in the formation and evolution of organic pores. The organic pores generated in the oil generation stage are easily occupied by pyrolytic bitumen. The shrinkage joint of organic matter / the edge pore of organic matter may be an important space for the occurrence of shale gas. Its development is mainly controlled by the physical and chemical structure and evolution of organic matter during the transformation from chemisorbed organic matter to physical adsorbed organic matter and free organic matter.
【作者单位】：页岩油气富集机理与有效开发国家重点实验室;国家能源页岩油研发中心;中国石油化工集团公司油气成藏重点实验室;中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所;
【基金】：国家自然科学基金石油化工联合基金项目(No.U1663202) 中国石油化工股份有限公司科技攻关项目(P14040)资助
【分类号】：P618.13

【相似文献】